MA334C Control Instruments and Systems

CURRENT INDUSTRIAL REPORTS SERIES
2007

MA334C — CONTROL INSTRUMENTS
DEFINITIONS AND SPECIAL INSTRUCTIONS

1. Scope of this survey

Control relay–A relay which functions to initiate or to
permit the next desired operation in a control circuit or
scheme.

This survey covers the manufacture of control
instruments.

Overload relay–A relay which functions at a
predetermined value of current (overcurrent relay).

2. Figures to be reported
Companies with more than one establishment
manufacturing the products covered by this survey are
requested to complete a separate report form for each
location. If you have not received a separate form for
each of your establishments, please call the contact
shown on the report form or write to the U.S. Census
Bureau for additional forms.

Busway–A prefabricated electric distribution system
consisting of bus bars in a protective enclosure, together
with associated fittings. All busways include as a
minimum: bus bars, some supporting means for these
bars, and a housing around them.

a. Quantity and Value of Shipments
The figures on quantity and value of shipments should
include the physical shipments of all products sold,
transferred to other establishments within your
company, or shipped on consignment, whether for
domestic or export sale. The value represents the net
sales price, f.o.b. plant, to the customer or branch to
which the products are shipped, net of discounts,
allowances, freight charges and returns. Shipments to
your own branches should be assigned the same value
as comparable sales to unaffiliated customers, i.e., the
value includes an appropriate allocation of company
overhead and profit. Products bought and resold without
further manufacture should not be included in
shipments.
b. Unit of measure
When posting your figures to the original report, please
be sure to report information in the correct columns.
These are:
Column 1 – Quantity of shipments
Column 2 – Value (Report shipments in thousands of
dollars. (Example: $1,000,000, report as $1,000)
Report value figures in thousands of dollars. Each
product should be reported separately. Do not combine
product lines.
3. Definitions
Many of the products are listed separately, either as
control components or as control assemblies. Report
separate data for such products, but do not report
separate control components which are sold as an
integral part of a control assembly.
Relay–A device that is operative by a variation in the
conditions of one circuit to effect the operation of other
devices in the same or another electric circuit.
USCENSUSBUREAU

Industrial control relays (all voltages)–A.c. and d.c.
operated electromagnetic relays rated for resistive loads
and used to perform logic functions in industrial
electronic applications. Includes plug-in, ice cube,
printed circuit card mounted and base mounted relays
with mounted timer attachments. Excludes timer
attachments sold separately, relays designed for use
with metal mill or crane control, and relays incorporated
in products covered by other categories. Also excludes
solid-state relays and relays designed for military
applications, or for the appliance or telephone industry.
3. Definitions—Continued
Electronic relays (all voltages)–A.c. and d.c. operated
electromagnetic relays rated for resistive loads and used
to perform logic functions in industrial electronic
applications. Includes plug-in, ice cube, printed circuit
card mounted and base mounted relays with mounted
timer attachments. Excludes timer attachments sold
separately, relays designed for use with metal mill or
crane control, and relays incorporated in products
covered by other categories. Also excludes solid-state
relays and relays designed for military applications.
Solid-state relays (all voltages)–Solid-state relays sold as
individual items. Typically, these are single circuit
devices that use a logic level signal to control a 120 volt
circuit. Excludes overcurrent relays and output devices
of logic systems sold separately, mill and crane
accessories, and similar items incorporated in a product
covered by any other category.
Solid-state industrial control timers (all voltages)-- Interval
and time-delay relays that have their timing period
controlled by a circuit using semiconductors, regardless
of output means. Excludes relays with solid-state timer
attachments and timers designed as solid-state logic
units or for metal mill or crane applications or
incorporated in products covered by other categories.
Nonsolid-state industrial control timers (all
voltages)–Mechanically or electrically operated a.c. or
d.c. timers designed primarily to operate in logic and

Page 1 of 9

CURRENT INDUSTRIAL REPORTS SERIES
control circuits of industrial applications. Includes
mechanically programmed timers, timing attachments
used with contactors or relays, motor driven, and
pneumatic timing relays, time delay relays (nonelectric),
interval timers and under voltage time delay relays.
Excludes solid-state timers, relays with timer
attachments mounted and timers designed as solid-state
logic units or for metal mill or crane applications or
incorporated in products covered by other categories.
SPECIFIC APPLICATION OR SPECIFIC INDUSTRY
CONTROLS:
Metal mill controls and accessories (all voltages)–Any a.c.
or d.c. power or control circuit device designed for and
sold separately for metal mill applications. Includes
master switches, limit switches (power or control
circuits), timers, relays, etc.
Crane and hoist controls (all voltages)–A.c. or d.c. control
assemblies designed to control hoist, trolley, and/or
bridge motion for application in mines, traffic carrying
bridges, elevators, and general industry. Includes crane
protective panels, hoist or crane master switches and
adjustable speed drives for these purposes, except
those for marine applications. Excludes crane and hoist
controls for marine applications, pendant control
stations, and other accessories sold separately.
Definite purpose contactors and starters (600 volts or
less)–Definite purpose full voltage contactors and
starters, including open and enclosed devices. Including,
but not limited to, heating loads, lighting loads,
refrigeration, solid-state starters and contact, etc.
Computer numerical controls–A computer-based motion
control device programmable in numerical word address
format, such as EIA RS-274D, RS-494, or equivalent
international standard. A computer numerical control
(CNC) product typically includes a CPU module,
associated panel and processor rack equipment,
operator interface devices, input/output signal and data
devices, software and related peripheral apparatus.
Robotic controls–A computer-based motion control
device primarily designed to control the motion of a
robot. A robot is defined as a “reprogrammable
multifunctional manipulator designed to move material,
parts, tools, or specialized devices through variable
program motions for the performance of a variety of
tasks.”
Other stand alone motion controls–Self-contained,
processor-based motion/positioning control devices for
single axis and multiaxis applications, programmable in
various languages, for control if servo or stepper drives
and motors.
Subordinate motion controls–Processor-based devices
which internally execute motion programs, yet rely on

connection to an external bus or rack for power,
communications, and supervisor control.
Programmable control motion module–A subordinate
motion control device which is intended for use in or with
a programmable controller.
Bus motion module–A subordination motion control
device which is intended for use with general purpose
computers, such as personal computers, VME, STD,
Multibus.
Chip-level device–Integrated circuit-based motion control
devices intended for incorporation in circuit board
designs.
Other specific purpose equipment (all voltages)–Any
industrial control equipment designed for a specific
application which is not covered by any other category,
such as aircraft contactors and controllers rated 601V up
to 2,200V, dynamic braking controls sold separately,
dimmers, and automatic transfer switches.
3. Definitions—Continued
SPECIFIC APPLICATION OR SPECIFIC INDUSTRY
CONTROLS—Continued
A.c. or d.c. control panels (all voltages)–Assemblies of
components in which the principal power circuits are a.c.
or d.c., for applications other than welding, marine
auxiliaries, crane, hoist, or adjustable speed drives. Also
excluded are panels which have been the outputs
controlled by solid-state digital logic. Specifically
included are analog controllers, furnace and lifting
magnet controls, regulators, and motor controls which
provide for plugging and/or dynamic braking.
GENERAL PURPOSE CONTROLS:
A.c. full voltage, noncombination magnetic starters (1,000
volts or less)–Electromagnetic switches with overload
protection rated in amperes, horsepower, or kilowatts for
application at full voltage with nonsynchronous motors.
Includes open and enclosed; single and multispeed;
reversing and nonreversing; electrically, mechanically,
or magnetically held; a.c. or d.c. operated; and controls
for one or more squirrel cage or wound rotor motors.
Excludes those starters which qualify for any “Specific
application” item.
A.c. full voltage combination magnetic starters (1,000 volts
or less)–Electromagnetic switches with or without
overload protection combined with a disconnect device,
rated in amperes, horsepower, or kilowatts for
application at full voltage with nonsynchronous motors.
Includes open and enclosed; single and multispeed;
reversing and nonreversing; electrically, mechanically,
or magnetically held; a.c. or d.c. operated; and controls
for one or more squirrel cage or wound rotor motors.
Variations include those with fusible or nonfusible

Page 2 of 9

CURRENT INDUSTRIAL REPORTS SERIES
disconnect switch or circuit breaker; all those for oil well,
irrigation, or other pumping application. Excludes those
starters which qualify for any “Specific application” item.
Disconnect switches (600 volts or less)–A 600 volt rated
switch intended primarily to be used with electric motor
controls, and where available, fault currents greater than
10 KA RMS symmetrical are likely to be encountered.
The device may be HP and ampere rated, and may
meet the requirements for service entrance
disconnecting means. “Safety Switches” are not
included in this category.
A.c. full voltage manual controllers (1,000 volts or
less)–Manual switches with or without overload
protection, with or without disconnect devices, rated in
amperes, horsepower, or kilowatts for application at full
voltage with nonsynchronous motors. Includes open and
enclosed; single and multispeed; reversing and
nonreversing; electrically, mechanically, or magnetically
held; a.c. or d.c. operated; and controls for one or more
squirrel cage or wound rotor motors. Variations include
toggle switches, drum switches, and loop switches.
Excludes those starters which qualify for any “Specific
application” item.
A.c. magnetic contactors (1,000 volts or less)–Electromagnetic switches without overload protection, and
without disconnect devices, rated in amperes,
horsepower, or kilowatts for application at full voltage
with nonsynchronous motors. Includes open and
enclosed; single and multispeed; reversing and
nonreversing; electrically, mechanically, or magnetically
held; a.c. or d.c. operated, for lighting, heating, motor,
power distribution, or high frequency applications.
A.c. reduced voltage magnetic or manual controllers (1,000
volts or less)–Magnetic switches without overload
protection, with or without disconnect devices, rated in
amperes, horsepower, or kilowatts, which start
nonsynchronous motors. Includes open and enclosed,
single and multispeed, reversing and nonreversing
types. Variations include controllers with a primary or
secondary resistor, reactor, auto-transformer, partwinding, and stardelta starters. Excludes those devices
which qualify for any “Specific application” item.
Synchronous motor controllers (1,000 volts or less)–
Armature and field controls for synchronous motors,
starting at full or reduced voltage. Excludes those
devices which qualify for any “Specific application” item.
Motor control centers (1,000 volts or less)–Factory-built
customer-assembled control centers, including the
sections and units sold separately.
Medium voltage nonsynchronous and synchronous motor
controllers (over 1,000 through 7,200 volts)–Manual and
magnetic devices for the control of squirrel cage, wound

rotor, and synchronous motors. Includes open and
enclosed; combination and noncombination starters and
contractors; full or reduced voltage; and reversing and
nonreversing air break, vacuum break, and immersed.
Excludes those devices which qualify for any “Specific
application” item.
A.c. or d.c. friction brakes and clutches (all voltages)–All
devices used to engage or control motion by slowing or
stopping, provided the clutch or brake is operated or
released electrically. Braking or clutch action may be
controlled mechanically, hydraulically, or magnetically,
using shoes or discs. Excludes dynamic braking
controls.
3. Definitions—Continued
GENERAL PURPOSE CONTROLS—Continued
Electromechanical positioning sensors (all voltages)–A.c. or
d.c. switches and sensors which respond to movement
or position. Includes mechanical and air operated limited
switches, and rotating CAM switches. Excludes those
devices used in or covered by “solid state digital control
systems” or are classified as “precision (1/8" gap or less)
snap-acting switches.”
Movement sensors (all voltages)–A device that detects if
an object is moving in relation to the sensors. Such
devices would include speed switches, encoders,
resolvers, tachometers, etc.
Non-optical proximity sensors–An a.c. or d.c. device that
detects a specified change in the energy field within the
sensing zone of the switch, and causes the output to
change its state. The energy field may be magnetic,
electromagnetic, acoustical or dielectric.
Optical proximity sensors (all voltages) (photo-electrics)–A
device that detects a specified change in light sensitivity
(i.e., absence, presence, intensity) within the sensing
zone of the switch, and causes output to change its
state.
D.c. power circuit devices (all voltages)–Manual and
magnetic devices sold separately for the control of d.c.
power. Includes open and enclosed, combination and
noncombination, full or reduced voltage, reversing or
nonreversing, air brake oil immersed. Excludes those
devices which qualify for any “Specific application” item.
Industrial control pushbuttons, selector switches, pilot lights,
and foot switches (all voltages)–A.c. or d.c. manually
operated devices designed primarily to operate in the
control circuits or industrial applications. Includes control
stations, reed devices, and rotary switches with control
circuit ratings. Excludes metal mill and crane
accessories and similar items incorporated in products
covered by other categories, such as conversion kits to
starters, and those designed for aircraft, appliances,
business machines, computers, or elevator applications.

Page 3 of 9

CURRENT INDUSTRIAL REPORTS SERIES
Resistors and rheostats–Separate components and
assemblies of carbon and metal resistors designed to
function in a power or motor field circuit. Includes
manual and motor operated rheostats, cast and wound
metal resistors, and carbon pile resistors. Excludes
resistors designed for use in electronics circuits.
A.c. and d.c. adjustable speed drive controls (all
voltages)–The control portion of adjustable (regulated)
speed drives, controlling motors by adjusting voltage or
adjusting frequency. Includes single and multimotor
drive controls, eddy current coupling drives, all elements
of the power units (except motor generators), and all
auxiliary controls sold as part of the drive system.
Excludes all rotating equipment.

Solid-state contactors–All primarily solid-state devices
designed to be used in the power circuit or control of
ovens, furnaces, lighting, or other power consuming
devices. This group also includes power switching
devices used for turning motors on and off only. This
does not include resistance welding controls, adjustable
speed drive controls, and any other product which
qualifies for inclusion in other “Specific application” or
“General industry control” categories.
This group also includes solid-state braking devices.
This does not include resistance welding controls,
adjustable speed drive controls, and any other product
which qualifies for inclusion in other “Specific
application” or “General industry control” categories.

Packaged a.c. adjustable speed drive–All equipment
required to adjust the speed or torque of an a.c. electric
motor(s) by controlling both frequency and voltage
applied to the motor(s). Includes rotating equipment.

All other general industry devices and systems–Solid-state
digital panels using either wired or retentive memory
logic to provide data or control processes or machine
functions systems, n.e.c.

Packaged d.c. adjustable speed drive–All equipment
required to adjust the speed or torque of a d.c.electric
motor(s) by controlling both frequency and voltage
applied to the armature and/or field of the motor(s).
Excludes rotating equipment.

Motor controller accessories–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 pushbuttons, selector switches, pilot lights,
separate controller enclosure and enclosure fittings,
reset mechanisms, etc. Excludes motor circuit switches
sold separately.

A.c. and d.c. drive systems–An engineering system built
to meet customer specifications, incorporating one or
more power conversion modules; may control several
motors in a coordinated manner. Includes a.c. and d.c.
types. Excludes rotating equipment.

Page 4 of 9

CURRENT INDUSTRIAL REPORTS SERIES
4. Comparability
Data reported in this survey should correspond to data reported in
the Economic Census - Manufacturing Sector form. The sum of
values for item codes shown in column (a) should correspond to
dollar values reported under product codes indicated in column (b)
below.
Current Industrial Reports
(Form MA334C)
Item codes
(a)

Economic Census Manufacturing Sector
Product codes
(b)

2005 through 2035

3345120000

3007 through 3085

3345130000

3108 through 3118

3353131000

3305 through 3345

3353133000

3505 through 3510

3353135000

3705 through 3720

3353137000

3805

3353139000

3905 through 3945

335313A000

4105 through 4130

3353141000

4305 through 4335

3353143000

4505 through 4595

3353146000

4708 and 4713

3353147000

Page 5 of 9

CURRENT INDUSTRIAL REPORTS SERIES
REFERENCE LIST
FORM

MA334C

Product
code

CONTROL INSTRUMENTS
Item
code

Item Description
CONTROLS FOR MONITORING RESIDENTIAL AND COMMERCIAL ENVIRONMENTS

3345120102
3345120115
3345120221
3345120224
3345120225
3345120227
3345120229

2005
2010
2015
2020
2025
2030
2035

Temperature responsive (thermostats)
Igniters
Computerized energy control systems for buildings
Other automatic controls
Temperature responsive controls for major appliances
All other controls for appliances
Parts and components for controls for monitoring residential and commercial
environments

3345120000

2097

Total controls for monitoring residential and commercial environments (sum of item
codes 2005–2035)
PROCESS CONTROL INSTRUMENTS

3345130101
3345130106
3345130107
3345130109
3345130111
3345130127
334513022G
334513021F
334513021V
334513032S
3345130240
3345130248
3345130249
3345130251
3345130264
3345130290
3345130293

3007
3010
3017
3020
3025
3030
3035
3040
3045
3050
3055
3060
3065
3070
3075
3080
3085

Unified electronic systems: controllers
Unified electronic systems: other
Unified electronic systems: auxiliary stations and analog computer devices
Nonunified electronic systems
Industrial multifunction process computers
Pneumatic systems and annunciators
Other industrial type instruments
Continuous process instruments
Instruments for all process variables not listed above
Parts for process control instruments
Temperature measuring instruments: electrical and electronic measuring types
Other temperature measuring instruments
Primary temperature sensors, excluding aircraft types: thermocouples
Primary temperature sensors, excluding aircraft types: other
Pressure and draft measuring instruments
Flow and liquid level measuring instruments: differential pressure types
Humidity instruments

3345130000

3097

Total process control instruments (sum of item codes 3005–3085)
POWER CIRCUIT BREAKERS

3353131101

3108

3353131103
3353131129

3110
3118

Power circuit breakers (sold separately) for use in metal-clad switchgear (oil and oilless), over 1,000 volts (report in number of breakers)
All other power circuit breakers, sold separately
Parts for all power circuit breakers

3353131000

3197

Total power circuit breakers (sum of item codes 3105–3115)
LOW VOLTAGE PANELBOARDS, DISTRIBUTION BOARDS, AND OTHER SWITCHING
AND INTERRUPTING DEVICES

3353133104
3353133201

3305
3310

Panelboards (include enclosing cabinets), circuit breaker
Panelboards (include enclosing cabinets), fusible

Page 6 of 9

CURRENT INDUSTRIAL REPORTS SERIES
REFERENCE LIST—Continued
FORM

MA334C

Product
code

Item
code

Item Description
LOW VOLTAGE PANELBOARDS, DISTRIBUTION BOARDS, AND OTHER SWITCHING
AND INTERRUPTING DEVICES—Continued

3353133207
3353133211
3353133216
3353133225
3353133227
3353133233
3353133237

3315
3320
3325
3330
3335
3340
3345

Distribution switchboards, fusible
Distribution switchboards, circuit breaker
Knife switches, enclosed: heavy duty
Knife switches, enclosed: circuit breaker
Knife switches, enclosed: other
Other switches
Other low voltage switchgear apparatus

3353133000

3397

Total low voltage panelboards, distribution boards, and other switching and
interrupting devices (sum of item codes 3305–3345)
FUSES AND FUSE EQUIPMENT

3353135109
3353135113

3505
3510

Nonrenewable plug and cartridge fuses
Other fuses and open fuse material (including renewable, cutouts, clips, bases, etc.)

3353135000

3597

Total fuses and fuse equipment (sum of item codes 3505 and 3510)
MOLDED CASE CIRCUIT BREAKERS

3353137105
3353137112
3353137117
3353137131

3705
3710
3715
3720

Molded case circuit breakers, industrial type
Molded case circuit breakers, residential or light duty type
Other: Marine, Navy, aircraft, and aerospace
All other types, including automotive and electronic

3353137000

3797

Total molded case circuit breakers (sum of item codes 3705–3720)

3353139000

3805

Ducts, including plug-in units and accessories (not exceeding 1,000 volts), consisting
of enclosed sectionalized prefabricated bus bars rated 20 amperes or more and
associated structures and fittings (report quantity in number of units)
SWITCHGEAR, EXCEPT DUCTS

335313A101
335313A204

3905
3910

335313A307
335313A311
335313A313
335313A321
335313A332

3915
3920
3925
3930
3935

335313A335
335313A337

3940
3945

Automatic and manual control panels
Metal clad switchgear (using power circuit breakers, oil and oil-less), all voltages above
1,000 volts, up to and including 38kV, excluding load interrupter switchgear
Metal enclosed load interrupter switchgear
Metal enclosed low voltage power circuit breaker
Metal enclosed bus when sold separately
Power switching equipment, indoor and outdoor
Connectors, all types (power and ground, overhead transmission and distribution, and
transmission and distribution
Power fuses, fuse links, and distribution cutouts
Other switchgear devices

335313A000

3997

Total switchgear, except ducts (sum of item codes 3905–3945)

Page 7 of 9

CURRENT INDUSTRIAL REPORTS SERIES
REFERENCE LIST—Continued
FORM

MA334C

Product
code

Item
code

Item Description
RELAYS

3353141101
3353141112
3353141117
3353141153
3353141180
3353141183

4105
4110
4115
4120
4125
4130

Industrial control relays (all types)
General purpose: Over 100 MV and sealed
General purpose: Over 100 MV and NOT sealed
High performance military/aerospace/aircraft relays
Timing relays (timers)
All other general purpose and special purpose relays, including parts

3353141000

4197

Total general purpose and other relays (sum of item codes 4105–4130)
SPECIFIC PURPOSE INDUSTRIAL CONTROLS

3353143301
3353143307

4305
4310

3353143311
3353143317
3353143323
3353143328
3353143333

4315
4320
4325
4330
4335

3353143000

4397

U.S. Coast Guard/Marine auxiliary controls and accessories
Crane and hoist controls, constant and adjustable voltage (including operators’ desks
and stations)
Definite purpose contactors and starters
Stand alone motion controllers: computer numerical controls
Stand alone motion controllers: other (include robotic controls)
Programmable controllers
Other specific or special purpose a.c. and d.c. controllers, other definite purpose
devices (Specify kind)
Total specific purpose industrial controls and power circuits devices (sum of item
codes 4305–4335)
GENERAL PURPOSE CONTROLS

3353146101
3353146109
3353146111
3353146117
3353146123
3353146131
3353146137
3353146142
3353146143
3353146146
3353146149
3353146152
3353146169
3353146171
3353146176
3353146179
3353146182
3353146185
3353146188
3353146192

4505
4510
4515
4520
4525
4530
4535
4540
4545
4550
4553
4555
4560
4565
4570
4575
4580
4585
4590
4595

A.c. full voltage noncombination magnetic starters (1,000 volts or less)
A.c. full voltage combination magnetic starters (1,000 volts or less)
Disconnect switches
A.c. full voltage manual controllers (1,000 volts or less)
A.c. contactors (1,000 volts or less)
Motor control centers
Brakes and clutches
Other general purpose controls
Electromedical positioning switches
Movement sensors
Nonoptical proximity sensors
Optical proximity sensors
Pushbuttons, under 30mm
Pushbuttons, 30mm and larger
Controls for a.c. packaged drives
Controls for d.c. packaged drives
A.c. drives systems
D.c. drives systems
Solid state motor controllers
All other general industry devices

3353146000

4598

Total general purpose industrial controls and power circuit devices (sum of item
codes 4505–4595)

Page 8 of 9

CURRENT INDUSTRIAL REPORTS SERIES
FORM MA334C
Product code

Item
code

Product description
MOTOR CONTROLLER ACCESSORIES

3353147102
3353147104

4708
4713

Motor controller accessories
Parts for industrial controls

3353147000

4797

Total motor controller accessories and parts for industrial controls (sum of item
codes 4708 and 4713)
SELECTED NONMANUFACTURING REVENUES

9999998900

8500

9999998041
9999998045

8501
8504

Resales—Sales of products bought and sold without further manufacture, processing,
or assembly
Research and development
Process control software products

NOTES:

10/31/07

Page 9 of 9