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In the presence of combustible gases, dust, vapors, fibers or flyings, electrical equipment must be designed to eliminate or contain any potential ignition source such as arcing or excessive temperatures. Explosion proof motors are not designed to survive an external explosion, but instead to avoid the possibility of igniting a fire or explosion. They are certified to operate safely in specific hazardous locations as classified by UL (North America), ATEX (Europe/International), or CSA (Canada).

Design Criteria

Explosion proof motors are required in these and other industries:

  • Mining
  • Oil and natural gas refining
  • Flour mills
  • Grain elevators
  • Textile mills
  • Industrial paint booths

Hazardous locations are classified by the types of hazardous materials and how likely they are to be present in a particular area under normal operating conditions. To operate safely in locations where flammable materials are continually present (such as UL Class 1, Division 1 or ATEX Zone 0 and 1 locations), explosion proof motors must incorporate these key design features:

  • The motor enclosure must be able to withstand and contain an internal explosion.
  • Ignition sources such as flames and sparks must not be permitted to reach the external environment where they could cause an explosion.
  • The surface temperature of the housing must never be hot enough to ignite combustible materials in the external environment, even under overload conditions or when the motor is insulated by a layer of hazardous dust. A temperature code (T-code) designates the maximum surface temperature range.
  • A nameplate must be supplied with the motor clearly stating the explosion-proof rating and, as applicable, the T-code.

Kollmorgen’s Explosion Proof Motors

Kollmorgen offers standard explosion proof motors that meet the certification requirements of UL, ATEX, and CSA. If one of our standard explosion proof offerings does not meet the certification or performance requirements you need, contact us to discuss your specific application requirements. We can evaluate additional certifications for a product, or we can recommend a frameless motor solution for incorporation and certification in an explosion proof system of your own design.

PMDC Explosion Proof (EP) SeriesPMDC Explosion Proof (EP) Series AC Synchronous X SeriesAC Synchronous X Series Goldline EB SeriesGoldline EB/EBH Series Stepper MX SeriesStepper MX Series
Motor Technology Type Brush, Permanent Magnet DC Brushless, AC Synchronous Brushless, Servo Brushless, Stepper
Typical Motion Profile and Loading Fixed Speed, Constant Load Fixed Speed, Constant Load Variable Speed, Dynamic Load Variable Speed, Constant Load
Frame Sizes NEMA 56C NEMA 42 & 66 4.49 " sq. to 8.91 " sq. NEMA 34 & 42
Input Voltages 12, 24, 90 & 180 VDC 120 & 240 VAC, 50/60 Hz up to 240 VAC up to 240 VAC
Drive/Amplifier Requirement No No Yes Yes
Torque Range 1.02 to 3.05 Nm 1.77 to 10.59 Nm 0.84 to 158 Nm 1.27 to 9.82 Nm
Speed Range 1750 rpm 60/72 rpm up to 7,500 rpm up to 3,000 rpm
UL, File E56538
Class 1, Divisions 1&2, Groups C&D
Class 2, Division 1&2, Groups F&G
Class 3, Divisions 1 & 2

UL, File E32246
Class 1, Divisions 1&2, Group D

UL, File E120721
Class 1, Divisions 1&2, Groups C&D

- or -

ATEX, File ITS12ATEX17548X
CE 0081 Ex II 2 G Ex d IIB T3 Gb -40ºC Ta 40ºC
IECEx ETL 12.0006X
(EB-80x excluded)

UL, File E120721 (MX9 Series)
UL, File E32246 (MX11 Series)

Class 1, Divisions 1&2, Group D
EP Series – Explosion Proof Motor – Kollmorgen

EP Series Explosion Proof >

These permanent magnet DC (PMDC) motors are SCR-rated and adhere to NEMA standards. They are available in a variety of DC voltages, from 1/4 to 3/4 HP.

Synchronous Haz Duty Medium

Hazardous Duty Synchronous Motors >

Providing torque up to 1,500 oz-in (1,059 N-cm), these synchronous motors are available in UL Listed versions suitable for use in Class I, Division 1&2, Group D hazardous locations. Frame sizes are NEMA 42 and 66 (110 mm and 170 mm).

Kollmorgen Goldline EB and EBH Series

Goldline EB and EBH Series >

Based on the 230 VAC B and M Series, the EB Series provides a high-performance explosionproof servomotor that is UL Listed for use in Class I, Division 1, Group C and D hazardous locations.

MX Series Hazardous Duty >

MX Series are Explosion-proof rated stepper motors, designed to meet Class I, Division 1&2, Group D hazardous location requirements. They are available in NEMA 34 and 42 frame sizes providing minimum holding torques from 1.27 to 9.82 N-m (180 to 1,390 oz-in).

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Related Resources

How do I know if my motor is explosion proof? >

An explosion proof motor is clearly marked with a nameplate that identifies its suitability for a given hazardous environment.  The nameplate will indicate the hazardous Class, Division, and Group for which the motor is suited.

Why use explosion proof motors? >

Electric motors generate heat under normal operating conditions and have the potential to generate a spark if a motor coil fails. Excessive motor case temperatures or a spark that is not properly contained can cause an explosion or ignite a fire in…