Current Industrial Reports U.S. Department of Commerce Economics and Statistics Administration Bureau of the Census Switchgear, Switchboard Apparatus, Relays, and Industrial Controls - 1997 MA36A(97)-1 Issued September 17, 1998 Information about the scope of the survey, methodology, explanation of terms, and historical notes for this survey may be found in the introduction of the 1996 Manufacturing Profiles, issued July 1998. Obtaining reports: Current data are released electronically on Internet for all individual surveys as they become available. Use http://www.census.gov/econ/www/manumenu.html. Individual reports can be accessed by choosing "Current Industrial Reports (CIR's)," clicking on "Report Number Index"; from the "Industrial Products by Numeric Index," choose the surveyof interest. Follow the menu to view the text (ASCII) file or PDF file or download the worksheet file (WK format) to your personal computer. These data are also available through the U.S. Department of Commerce and STAT-USA Electronic Bulletin Board by subscription. To access, dial 202-482-3870 and follow the prompts to register. Also, you may call 202-482-1986 or 1-800-STAT-USA, for further information. The Internet address is: stat-usa.gov/. For mail or fax copies of the publication, contact the Manufacturing and Construction Division Information Center, 301-457-4673. Address inquiries concerning these data to U.S. Department of Commerce, Bureau of the Census, Manufacturing and Construction Division, Washington, DC 20233, or call Tempie Whittington, 301-457-4800. Summary of Findings During 1997, the total value of shipments of switchgear and switchboard apparatus was $6.7 billion, up 4.8 percent from the 1996 value of $6.4 billion. The 1997 shipments include power circuit breakers valued at $456.3 million, an increase of 10.6 percent from 1996; low voltage panelboards, valued at $2.2 billion, an increase of 4.4 percent from 1996; fuses and fuse equipment, valued at $557.4 million, an increase of 6.7 percent from 1996; molded case circuit breakers, valued at $1.3 billion, an increase of 5.4 percent from 1996; duct, valued at $278.1 million, an increase of 9.3 percent from 1996; and switchgear valued at $1.9 billion, an increase of 2.3 percent from 1996. During 1997, the total value of shipments of relays and industrial controls was $9.3 billion, up 2.2 percent from the 1996 value of $9.1 billion. The 1997 shipments include general-purpose relays valued at $850.8 million, an increase of 8.2 percent from 1996; specific purpose industrial controls, valued at $3.5 billion, an increase of 2.0 percent from 1996; general purpose industrial controls, valued at $4.4 billion, an increase of 0.7 percent from 1996; and motor controller accessories valued at $554.4 million an increase of 7.4 percent from 1996. Table 1. Value of Shipments of Switchgear, Switchboard Apparatus, Relays, and Industrial Controls: 1992 to 1997 [Millions of dollars] Product code Product description 1997 1996 1995 1994 1993 1992 36132 Power circuit breakers................. 456.3 412.7 442.9 550.9 520.8 480.8 36133 Low-voltage panelboards................ 2,186.7 2,093.3 2,025.4 1,750.8 1,687.1 1531.1 36134 Fuses and fuse equipment............... 557.4 522.2 500.1 382.1 319.9 412.8 36135 Molded case circuit breakers........... 1,283.6 1,218.1 1,173.4 1,132.9 1,009.8 954.7 36136 Duct, 1,000 volts and under............ 278.1 254.5 238.5 227.9 200.1 189.1 36139 Switchgear (except ducts).............. 1,911.6 1,868.2 1,758.3 1,663.7 1581.3 161.5 36251 Relays, general purpose................ 850.8 786.6 808.1 804.0 750.6 781.5 36252 Specific purpose industrial controls... 3,523.3 3,454.9 3,312.4 2,747.9 2321.6 1915.7 36253 General purpose industrial controls.... 4,353.8 4,323.8 4,189.2 3,840.3 3326.3 2778.2 36254 Motor controller accessories and parts for industrial controls......... 554.4 516.4 503.3 511.6 476.4 447.9 Table 2. Shipments of Switchgear, Switchboard Apparatus, Relays, and Industrial Controls: 1997 and 1996 [Quantity in number of units. Value in thousands of dollars] No. 1997 1996 Product Product description of. code cos. Quantity Value Quantity Value 3613 -- Switchgear and switchboard apparatus:... (NA) (X) 6,673,723 (X) 6,368,948 36132 - Power circuit breakers, all voltages.. 33 (X) 456,296 (X) 412,680 36132 16 Power circuit breakers (sold separately) for use in metal-clad switchgear, oil and oilless, over 1,000 volts, (number of breakers).. 10 4,246 a/ 45,524 3,304 42,908 36132 17 Parts for power circuit breakers for use in metal-clad switchgear 1/.... 5 (X) (D) (X) (D) 36132 21 Power circuit breakers, free standing, oil and oilless, from 15.5 kV through 800 kV and above, (number of breakers)............... 8 4,426 165,061 3,238 147,652 36132 22 Parts for power circuit breakers, free standing, oil and oilless, from 15.5 kV through 800 kV and above 1/........................... 3 (X) 12,723 (X) 12,602 36132 26 Power circuit breakers (sold separately) in individual enclosures and/or for use in low- voltage switchgear, 1,000 volts and below, excluding molded case circuit breakers ) (number of breakers) 2/....................... 9 (D) (D) (D) (D) 36132 27 Parts for power circuit breakers in individual enclosures and/or for use in low-voltage switchgear, 1,000 volts and below, excluding molded case circuit breakers) 2/... 5 (X) (D) (X) (D) 36132 31 All other power circuit breakers (sold separately), oil and oilless, network protectors and automatic circuit reclosers 2/............... 8 (X) 180,972 (X) 175,824 36132 32 Parts for all other power circuit breakers, oil and oilless, network protectors and automatic circuit reclosers.......................... 14 (X) 52,016 (X) r/ 33,694 36133 - Low voltage panelboards, distribution boards, and other switching and interrupting devices, 1,000 volts and below............................ 125 (X) 2,186,671 (X) 2,093,277 Panelboards, including enclosing cabinets: 36133 11 Fusible, including combination switch fuse...................... 43 (S) 154,516 (S) r/ 161,144 36133 12 Circuit breaker................... 53 1,193,896 551,937 1,057,960 483,427 Distribution switchboards: 36133 15 Fusible........................... 32 34,582 108,510 r/ 36,072 r/ 112,747 36133 17 Circuit breaker................... 45 84,539 343,635 r/ 78,091 323,222 36133 19 Other, including theater switchboards..................... 7 4,923 5,208 r/ 3,643 r/ 4,015 Switches (except switches commonly known as snap, toggle, and rotary switches and switch devices intended primarily to be used with electric motor controls): Knife switches, enclosed: 36133 21 Heavy duty...................... 10 1,546,205 181,742 1,794,738 170,864 36133 22 General duty.................... 6 1,382,275 68,621 1,567,589 69,328 36133 24 Enclosed fusible, service entrance, and branch circuit cutouts........................ 8 474,260 28,567 930,081 25,038 36133 26 Circuit breaker type............ 15 (S) 262,467 (S) 270,810 Load centers: 36133 32 Grouped metering panels (combinations of two or more meters and related switching units with overcurrent protection associated with each meter, including accessory components, excluding single socket load combinations)...... 14 (S) a/ 35,089 (S) 39,878 36133 33 Other switches, excluding snap, bolted, toggle, push, etc., including open knife switches, motor contact, motor disconnect, meter service equipment other than metermounting, and test devices........................ 22 (X) a/ 163,461 (X) 160,986 36133 98 Other low voltage switchgear apparatus.......................... 30 (X) a/ 282,918 (X) 271,818 36134 - Fuses and fuse equipment, under 2,300 volts (except power distribution cutouts) ............................ 24 (X) b/ 557,363 (X) 522,201 36134 31 Nonrenewable plug fuses 3/.......... 3 (X) (D) (X) (D) 36134 51 Nonrenewable cartridge fuses........ 10 (X) b/ 261,953 (X) 254,408 36134 71 Renewable plug and cartridge fuses, including renewable links 3/....... 3 (X) b/ 4,382 (X) 5,605 36134 93 Other fuses and open fuse material, including cutouts, clips, bases, etc................................ 22 (X) b/ 291,028 (X) 262,188 36135 - Molded case circuit breakers, 1,000 volts and under...................... 33 (D) 1,283,649 (D) 1,218,119 Industrial type, assembled as complete units in supporting and enclosing housing of insulating materials, with or without accessories or attachments: 36135 14 With ground fault detection capability....................... 15 a/ 75,496 29,291 71,642 r/ 27,391 36135 16 Without ground fault detection capability....................... 17 31,578,925 680,198 27,808,120 606,674 Residential or light duty type, (primarily) for load center application, assembled as complete units in supporting and enclosing housing of insulating materials: 36135 18 With ground fault detection capability 4/.................... 7 (D) (D) (D) (D) 36135 19 Without ground fault detection capability 4/.................... 6 48,710,661 269,478 51,980,001 288,322 36135 31 Individually enclosed industrial type, excluding panelboards and busway plugs....................... 13 (S) 16,187 (S) 15,747 Other molded case circuit breakers: 36135 91 Marine and Navy type 5/........... 4 (D) (D) (D) (D) 36135 92 Aircraft and aerospace 5/......... 6 1,417,854 127,551 1,293,889 119,165 36135 93 Automotive 6/..................... 2 (D) (D) (D) (D) 36135 94 Electronic 6/..................... 5 (D) (D) (D) (D) 36135 95 All other types 6/................ 12 66,548,291 160,944 59,535,988 r/ 160,820 36136 - Duct, including plug-in units and accessories, 1,000 volts and under, consisting of enclosed sectionalized prefabricated bus bars rated 20 amperes or more and associated structures and fittings.............. 22 2,148,413 278,147 1,484,533 254,475 36136 11 Busways 7/.......................... 20 (D) (D) (D) (D) 36136 31 Trolly-type and lighting distribution duct 7/............... 3 2,148,413 278,147 1,484,533 254,475 36139 - Switchgear (except ducts)............. 129 (X) 1,911,597 (X) 1,868,196 36139 07 Automatic and manual control panels (generators,transformers, feed- controls, etc.).................... 68 (X) 307,356 (X) 301,801 36139 09 Metal-clad switchgear (using power circuit breakers, oil and oilless), all voltages above 1,000 volts, up to and including 38 Kv, excluding load interrupter switchgear........ 43 (X) a/ 355,286 (X) r/ 348,774 36139 10 Metal-enclosed load interrupter switchgear assemblies, all voltages, including parts.......... 37 (X) 183,797 (X) r/ 201,949 36139 13 Metal-enclosed low-voltage power circuit breaker switchgear assemblies 1,000 volts and below, including parts and excluding load interrupter switchgear............. 33 (X) a/ 147,196 (X) 165,116 36139 17 Metal-enclosed bus bars when sold separately, above 1,000 volts, including isolated, segregated, nonsegregated and cable bus bars... 18 (X) a/ 45,670 (X) r/ 39,191 Power switching equipment, 2,300 volts and over, including attachments, auxiliaries, bus supports and fittings, and accessories, but excluding power fuses sold separately.(Also includes single phase circuit reclosers: 36139 41 Outdoor, excluding structures..... 28 (X) 372,826 (X) 337,931 36139 45 Indoor............................ 9 (X) 7,091 (X) 3,434 36139 51 Power fuses and fuse links for 2,300 volts and over, ac service,excluding distribution cut-outs 8/........................ 11 (X) (D) (X) (D) 36139 81 Power and ground connectors generally used in substation construction 8/.................... 6 (X) 158,741 (X) 143,179 36139 91 Overhead transmission and distribution connectors (clamps, taps, terminals, and splices)...... 6 (X) 45,946 (X) 41,729 36139 93 Transmission and distribution connectors, n.e.c., including underground deadends, hot line taps, stirrups, repair sleeves, etc. 9/............................ 4 (X) (D) (X) (D) 36139 83 Distribution cutouts................ 9 (X) 83,208 (X) 84,888 36139 98 Other switchgear devices, including regulators and miscellaneous 24 (X) switchboard devices (for sale separately) 9/..................... a/ 204,480 200,204 3625 -- Relays and industrial controls.......... (NA) (X) 9,282,244 (X) 9,081,688 36251 - general purpose and other relays...... 116 (X) 850,771 (X) 786,615 36251 01 Industrial control relays (all voltages), n.e.c................... 42 (S) a/ 247,979 (S) r/ 229,950 General purpose electromechanical relays: Over 100 MW actuating power and sealed (either hermetically or environmentally): 36251 03 0 through 2.0 amps contact rating 10/..................... 8 (D) (D) (D) (D) 36251 04 Over 2.0 through 10.0 amps contact rating................. 16 967,769 22,963 r/ 921,178 24,219 36251 05 Over 10.0 amps contact rating 10/..................... 6 1,505,079 25,440 (S) 36,690 Over 100 MW actuating power and not sealed: 36251 02 0 through 10.0 amps contact rating......................... 14 a/ 955,637 a/ 9,376 1,339,791 13,750 36251 10 Over 10.0 amps contact rating 11/..................... 12 (D) (D) (D) (D) 36251 11 0 through 100 MW actuating power (both sealed and not sealed 11/.. 2 a/ 859,216 9,842 1,250,927 10,082 Miniature printed circuit mounted electromechanical relays, excluding reed relays (profile height 1/2 inch max.): Sealed (either hermetically or environmentally): 36251 12 0 through 2.0 amps contact rating 12/................... 4 (D) (D) (D) (D) 36251 15 Over 2.0 amps contact rating 12/................... 3 11,115,959 13,276 10,235,539 12,305 36251 20 Not sealed...................... 4 (D) (D) (D) (D) DIP or SIP footprint 36251 19 Sealed (either hermetically or environmentally).......... 2 (D) (D) (D) (D) Telephone relays, all types: 36251 22 Sealed (either hermetically or environmentally) 13/........... 4 (D) (D) (D) (D) 36251 23 Not sealed 13/.................. 4 c/ 12,844,017 c/ 14,205 6,722,880 7,497 36251 30 General purpose solid-state relays, pure solid-state and hybrid solid- state, excluding time delay........ 10 (D) (D) (D) (D) High performance military/aerospace/ aircraft relays and contactors generally pertaining to Mil-R5757, 6106, 19523, 25108, and 39016): 36251 31 Round and square can multipole airframe relays and contractors (both sealed and not sealed) (all sizes)...................... 5 (D) (D) (D) (D) Crystal can types (sealed): 36251 32 Larger than full size........... 5 (S) 25,317 344,030 21,539 36251 33 Full size....................... 5 184,164 12,564 174,140 12,522 36251 37 Half size and smaller, including TO-5 package 14/............... 4 (D) (D) (D) (D) 36251 52 RF, antenna and coaxial relays (sealed and not sealed), excluding reed relays 14/........ 7 a/ 1,820,947 89,325 r/ 1,744,353 r/ 69,762 Reed relays: Dry reed: 36251 59 Miniature size (glass length 10 less than .85 inches)15/....... (D) (D) (D) (D) 36251 61 Standard size 15/............... 7 21,888,345 42,432 17,758,964 34,801 36251 66 Mercury wetted reed 16/........... 6 (D) (D) (D) (D) 36251 69 Stepping switches, stepping and impulse relays 16/................. 4 (D) (D) (D) (D) 36251 75 Switchgear and protective relays 16/......................... 6 627,338 25,731 572,202 19,818 Timing relays (timers): 36251 79 Solid-state/EMR combination....... 24 b/ 1,199,009 b/ 36,050 930,410 25,936 36251 81 Solid-state-pure.................. 18 322,272 14,750 250,357 11,050 36251 82 All other timing relays (timers), including pneumatic, motor 15 driven, electronic, etc.......... 450,148 18,829 432,999 17,517 36251 92 All other general purpose and special purpose relays, n.e.c...... 25 (X) 169,208 (X) 160,865 36251 96 Parts for general-purpose and special-purpose relays (sold separately)........................ 9 (X) b/ 16,796 (X) 28,308 36252 - Specific-purpose industrial controls.. 250 (X) 3,523,286 (X) 3,454,885 36252 45 U.S. Coast Guard, Navy, and Marine auxiliary controls and accessories. 24 62,807 137,411 75,612 130,539 36252 47 Metal mill controls and accessories (all voltages)..................... 8 (D) (D) (D) (D) 36252 48 Crane and hoist controls, constant and adjustable voltage, including operators' desks and stations...... 19 36,392 131,630 44,595 127,078 36252 49 Definite purpose contactors and starters (600 volts and less)...... 19 10,789,899 135,262 11,797,777 r/ 160,097 Machine tool applications (motion controllers): Stand-alone controls for numerically controlled machine tools: 36252 51 Computer numerical controls (CNC); postioning (point-to-point)............... 12 9,523 23,097 9,449 22,262 36252 55 Computer numerical controls (CNC); continuous path (Contouring)................... 13 46,732 288,923 35,570 277,992 36252 57 Robotic controls................ 4 (D) (D) (D) (D) 36252 58 Other stand-alone motion controls ...................... 13 51,307 92,696 r/ 70,973 r/ 91,891 36252 60 Subordinate motion controls ...... 12 (S) a/ 15,156 (S) r/ 15,471 36252 71 Programmable controllers, sold separately........................ 56 (S) 1,223,469 (S) r/ 1,133,627 36252 76 Other specific-or special-purpose ac and dc controllers, other definite purpose devices........... 157 (X) a/ 1,365,793 (X) 1,377,299 36253 - General purpose industrial controls and power circuit devices............ 262 (X) 4,353,770 (X) 4,323,798 General purpose controls: 36253 01 AC full voltage non-combination magnetic starters (1,000 volts or less) ........................ 24 b/ 968,714 155,910 1,153,398 154,856 AC full voltage combination magnetic starters (1,000 volts or less): 36253 03 Combination starters, (less pumping panels) ............... 22 106,068 67,983 r/ 129,062 73,427 36253 05 Pumping panels ................. 19 62,505 36,411 38,991 29,572 36253 06 Disconnect switches (600 volts or less)......................... 19 2,519,221 55,758 1,977,834 56,476 AC full voltage manual controllers, 1,000 volts or or less: 36253 23 Designed and rated to U. S. National Standards (NEMA)...... 12 1,285,192 48,515 r/ 1,290,669 48,886 36253 25 Designed and rated to International Standards (IEC).......................... 7 (S) 722 (S) r/ 769 AC contactors, 1,000 volts or less, excluding controls for packaged adjustable speed drives and synchronous motor control: 36253 27 Designed and rated to U. S. National Standards (NEMA)...... 14 577,622 82,837 r/ 483,249 68,231 36253 29 Designed and rated to International Standards (IEC).. 16 (D) (D) (D) (D) 36253 14 AC reduced voltage controls, 1,000 volts or less, excluding synchronous motor starters....... 21 a/ 89,112 a/ 63,267 77,689 59,024 36253 15 Synchronous motor starters, 1,000 volts or less, including both full and reduced voltage......... 4 (D) (D) (D) (D) 36253 16 Motor control centers, 1,000 volts or less.................... 38 (X) 437,495 (X) 422,834 36253 18 Starters and contactors for squirrel cage and wound rotor and synchronous and non-synchrous motors, over 1,000 to 7,200 volts, air break, vacuum, and oil immersed..................... 8 43,844 77,887 70,354 85,605 36253 21 Brakes and clutches............... 20 1,474,894 70,047 1,138,134 66,827 36253 34 Digital readout systems, including dial or plugboard type. 22 7,823 a/ 4,677 7,868 r/ 8,592 Presence sensors and motion measurement devices: Limit switches (positioning sensors): 36253 32 Electromechanical positioning sensors......................... 30 (X) 135,698 (X) r/ 129,496 36253 33 Movement sensors................. 19 (X) 37,892 (X) 35,815 Solid-state positioning sensors: 36253 35 Non-optical proximity sensors..... 18 (X) 90,302 (X) 80,040 36253 36 Optical proximity sensors......... 15 (X) 154,285 (X) 132,925 36253 37 All other pilot circuit devices, excluding relays and limit switches........................... 12 (X) c/ 15,780 (X) 26,619 36253 38 DC power circuit devices (all voltages).......................... 12 (X) b/ 28,235 (X) r/ 26,219 36253 39 Other control sensors (all voltages).......................... 18 (X) 104,253 (X) r/ 109,955 Pushbuttons and pushbutton stations, excluding operators' desks and stations: 36253 42 Pushbuttons, 18 mm and smaller.... 14 (X) 7,581 (X) r/ 8,536 36253 46 Pushbuttons, 19 mm to 29 mm....... 19 (X) 62,319 (X) 49,178 36253 48 Pushbuttons, 30 mm and larger..... 24 (X) 211,561 (X) r/ 208,659 36253 81 Rheostats and resistors (except for electronic applications) sold separately, n.e.c. ................ 14 (X) 24,215 (X) 22,001 Controls for adjustable speed drives, including electronic and nonelectric and operators' desks and stations: 36253 83 Controls for AC packaged drives. 37 570,415 376,332 549,023 r/ 436,571 36253 84 Controls for DC packaged drives. 29 218,226 104,740 265,329 r/ 120,114 36253 85 AC drives systems............... 35 b/ 70,616 a/ 197,712 68,502 239,709 36253 86 DC drives systems............... 26 359,694 a/ 111,465 396,683 154,594 36253 98 Solid-state motor controllers (all voltages)................... 48 1,715,242 252,950 r/ 1,839,990 r/ 231,740 36253 99 All other general industry devices and systems.............. 102 (X) 1,287,178 (X) r/ 1,184,817 36254 - Motor controller accessories and parts for industrial controls............. 132 (X) 554,417 (X) 516,390 36254 91 Motor controller accessories, including those items which are sold separately, but become part of a motor controller. Includes overload relays, auxiliary contacts, heater elements, mechanical interlocks, control transformers, kits to add push buttons, selector switches, pilot lights, separate controller enclosure fittings, reset mechanisms, etc., excluding motor circuit switches sold, separately.. 43 (X) 184,010 (X) r/ 164,154 36254 97 Parts for industrial controls....... 107 (X) 370,407 (X) 352,236 - Represents zero. D Withheld to avoid disclosing data for individual companies. NA Not avalilable. n.e.c. Not elsewhere classified. r/ Revised by 5 percent or more from previously published data. S Does not meet publication standards. X Not applicable. 1/Product code 36132 17 is combined with product code 36132 22 to avoid disclosing data for individual companies. 2/Product code 36132 26 are combined with product codes 36132 27 and 36132 31 to avoid disclosing data for individual companies. 3/Product code 36134 31 is combined with product code 36134 71 to avoid disclosing data for individual companies. 4/Product code 36135 18 is combined with product code 36135 19 to avoid disclosing data for individual companies. 5/Product code 36135 91 is combined with product code 36135 92 to avoid disclosing data for individual companies. 6/Product code 36135 93 is combined with product codes 36135 94 and 36135 95 to avoid disclosing data for individual companies. 7/Product code 36136 11 is combined with product code 36136 31 to avoid disclosing data for individual companies. 8/Product code 36139 51 is combined with product code 36139 81 to avoid disclosing data for individual companies. 9/Product code 36139 93 is combined with product code 36139 98 to avoid disclosing data for individual companies. 10/Product code 36251 03 is combined with product code 36251 05 to avoid disclosing data for individual companies. 11/Product code 36251 10 is combined with product code 36251 11 to avoid disclosing data for individual companies. 12/Product code 36251 12 is combined with product code 36251 15 to avoid disclosing data for individual companies. 13/Product code 36251 22 is combined with product code 36251 23 to avoid disclosing data for individual companies. 14/Product code 36251 37 is combined with product code 36251 52 to avoid disclosing data for individual companies. 15/Product code 36251 59 is combined with product code 36251 61 to avoid disclosing data for individual companies. 16/Product code 36251 66 is combined with product codes 36251 69 and 36251 75 to avoid disclosing data for individual companies. Note: The percent of estimation of each item is indicated as follows: a/10 to 25 percent of this item is estimated. b/25 to 50 percent of this item is estimated. c/Over 50 percent of this item is estimated. Table 3. Shipments, Exports, Imports, and Apparent Consumption of Switchgear, Switchboard Apparatus,Relays, and Industrial Controls: 1997 and 1996 [Value in thousands of dollars] Exports of Manufacturers' domestic Product description shipments merchandise Imports Product (value f.o.b. (value at for code plant) port) 1/ consumption 1997 36132 16, 21 Power circuit breakers................. 388,957 128,324 84,546 26, 31 36132 17, 22 Parts for power circuit breakers....... 67,339 180,587 48,086 27, 32 36133 11, 12 Low voltage panelboards and 15, 17, 19 distribution boards................... 1,163,806 117,953 275,231 36133 21, 22 Knife switches......................... 250,363 3,587 9,137 36134 00 Fuses and fuse equipment, under 2,300 volts........................... 557,363 162,174 94,889 36135 00 Molded case circuit breakers, 1,000 volts and under....................... 1,283,649 123,817 298,484 36136 00 Duct, including plug-in units and accessories........................... 278,147 50,749 6,404 36139 07, 09 Switchgear and switchgear 10, 13, 17 assemblies 3/......................... (D) (D) (D) 41, 45, 83 98 36139 51 Power fuses and fuse links, 2,300 volts and over 3/........................... (D) (D) (D) 36139 81, 91 Power and ground connectors and 93 transmission and distribution connectors 3/......................... 1,911,597 285,980 122,723 36251 01, 03 Relays................................. 783,690 422,209 737,511 04, 05, 02 10, 11, 12 15, 20, 30 31, 32, 33 37, 52, 59 61, 66, 69 75, 81, 82 92 36252 51, 55 Controls for numerically controlled machine tools......................... 312,020 29,750 48,026 36252 71 Programmable controllers............... 1,223,469 136,206 328,126 36253 01, 03 Motor starters......................... 260,304 43,336 46,462 05, 15 36253 16 Motor control centers, 1,000 volts or less............................... 437,495 68,618 38,850 36253 21 Brakes and clutches.................... 70,047 26,170 65,023 36253 32, 33 Limit switches......................... 173,590 10,544 16,767 36253 81 Rheostats and resistors................ 24,215 9,992 10,938 1996 36132 16, 21 Power circuit breakers................. 365,094 125,667 75,374 26, 31 36132 17, 22 Parts for power circuit breakers....... 47,586 160,877 41,936 27, 32 36133 11, 12 Low voltage panelboards and 15, 17, 19 distribution boards................... 1,084,555 126,683 211,789 36133 21, 22 Knife switches......................... 240,192 2,793 4,031 36134 00 Fuses and fuse equipment, under 2,300 volts........................... 522,201 131,419 82,636 36135 00 Molded case circuit breakers, 1,000 volts and under....................... 1,218,119 92,281 251,919 36136 00 Duct, including plug-in units and accessories........................... 254,475 39,007 9,823 36139 07, 09 Switchgear and switchgear 10, 13, 17 assemblies 3/......................... (D) (D) (D) 41, 45, 83 98 36139 51 Power fuses and fuse links, 2,300 volts and over 3/........................... (D) (D) (D) 36139 81, 91 Power and ground connectors and 93 transmission and distribution connectors 3/......................... 1,868,196 270,272 123,049 36251 01, 03 Relays................................. 724,819 460,285 696,704 04, 05, 02 10, 11, 12 15, 20, 30 31, 32, 33 37, 52, 59 61, 66, 69 75, 81, 82 92 36252 51, 55 Controls for numerically controlled machine tools......................... 300,254 25,112 62,605 36252 71 Programmable controllers............... 1,133,627 116,090 273,939 36253 01, 03 Motor starters......................... 257,855 37,851 49,707 05, 15 36253 16 Motor control centers, 1,000 volts or less............................... 422,834 53,197 30,640 36253 21 Brakes and clutches.................... 66,827 22,503 53,118 36253 32, 33 Limit switches......................... 165,311 9,351 29,096 36253 81 Rheostats and resistors................ 22,001 4,649 13,300 D Withheld to avoid disclosing data for individual companies. NA Not available. 1/Source: U.S. Bureau of the Census report EM 545, U.S.Exports. 2/Source: U.S. Bureau of the Census report IM 145, U.S.Imports for Consumption. 3/Data for "Switchgear and switchgear assemblies" and "Power fuses and fuse links" are combined with "Power and ground connectors" and "Transmission and distribution connectors" to avoid disclosing data for individual companies. Table 4. Comparison of Standard Industrial Classification-Based Product Codes with Schedue B Export Numbers, and HTSUSA Import Numbers: 1997 Product Export Import code Product description number 1/ number 2/ 36132 16, 21, Power circuit breakers 8535.21.0000 8535.21.0000 26, 31 8535.29.0020 8535.29.0020 8535.29.0040 8535.29.0040 8536.20.0040 8536.20.0040 36132 17, 22, Parts for power circuit breakers 8538.90.8020 8538.90.8020 27, 32 36133 11, 12, Low voltage panelboards and 8537.10.9050 8537.10.9050 15, 17 distribution boards 36133 21, 22 Knife switches 8536.50.9045 8536.50.9045 36133 32, 98 Grouped metering panels, including 8537.10.9020 8537.10.9020 accessory components and other low voltage switchgear appararus 36134 00 Fuses and fuse equipment, under 2,300 8535.10.0040 8535.10.0040 volts 8536.10.0020 8536.10.0020 8536.10.0040 8536.10.0040 36135 00 Molded case circuit breakers, 1,000 8536.20.0020 8536.20.0020 volts and under 36136 00 Duct, including plug-in units and 8536.90.8010 8536.90.8010 accessories 36139 07, 09, Switchgear, including switchgear 8537.20.0020 8537.20.0020 10, 13, 41, assemblies and power switching 45, 83, 98 equipment, excluding power fuses 36139 51 Power fuses and fuse links, 2,300 8535.10.0020 8535.10.0020 volts and over 36139 81, 91, Power and ground connectors; and 8535.90.8040 8535.90.8040 93 transmission and distribution connectors, n.e.c. 36251 01, 02, Relays 8536.41.0005 8536.41.0005 03, 04, 05, 8536.41.0020 8536.41.0020 10, 11, 12, 8536.41.0030 8536.41.0030 15, 20, 30, 8536.41.0045 8536.41.0045 31, 32, 33, 8536.41.0050 8536.41.0050 37, 52, 59, 8536.41.0060 8536.41.0060 61, 66, 69, 8536.49.0050 8536.49.0050 75, 81, 82, 8536.49.0055 8536.49.0055 92 8536.49.0065 8536.49.0065 8536.49.0075 8536.49.0075 8536.49.0080 8536.49.0080 36252 51, 55 Controls for numerically controlled 8537.10.9030 8537.10.9030 machine tools 36252 71 Programmable controllers 8537.10.9060 8537.10.9060 36253 01, 03, Motor starters 8536.50.4000 8536.50.4000 05, 15 36253 16 Motor control centers, 1,000 volts 8537.10.6000 8537.10.6000 or less 36253 21 Brakes and clutches 8505.20.0000 8505.20.0000 36253 32, 33 Limit switches 8536.50.8055 8536.50.8055 36253 81 Rheostats and resistors 8533.40.0040 8533.40.8040 8533.40.8040 1/ Source: 1997 edition, Harmonized System-Based Schedule B, Statistical Classification of Domestic and Foreign Commodities Exported from the United States. 2/ Source: Harmonized Tariff Schedule of the United States, Annotated (1997).