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Explosion proof motors

These specially designed electric motors are constructed in such a way that neither hot surfaces nor electrical sparks can come into contact with a potentially explosive atmosphere. Various technical protection methods are used to ensure safe operation even under critical conditions.

Explanation of zones

Zone 1
An explosive gas atmosphere may occasionally occur during normal operation.
Example: Areas near a conveyor line with highly volatile solvents.

Zone 2
An explosive gas atmosphere occurs rarely and only for a short time.
Example: Areas where gas only escapes in the event of a malfunction.

Zone 21
An explosive dust atmosphere may occasionally occur during normal operation.
Example: Areas directly adjacent to a filling plant for flour or sugar.

Zone 22
An explosive dust atmosphere occurs rarely and only for a short time.
Example: Area around a packaging machine where dust only escapes in the event of a leak.

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Types of explosion protection

Increased Safety (eb)

In motors with explosion protection class eb, all components are designed so that under normal operating conditions no sparks, hot surfaces, or loose connections can occur that could ignite an explosive atmosphere. This design is suitable for use in Zone 1 hazardous areas and offers a high level of safety combined with reliable operation.

 

Efficiency class: IE2 or IE3

  Frame:  63 - 400

  Power:  0.18 - 300 kW

  RPM:    3000, 1500, 1000, 750 rpm

  Designs: IM B3, IM B35, IM B5, IM B14, IM B34 and derived designs according to EN 60034-7

Flameproof Enclosure (db)

With protection class db, all spark- or heat-generating parts of the motor are enclosed in a flameproof housing. Should an explosion occur inside, the housing withstands the pressure and prevents the explosion from escaping to the outside and igniting the surrounding explosive atmosphere. This design is suitable for use in Zone 1 and offers a particularly high degree of protection in hazardous areas.

 

Efficiency class: IE3 or IE4

  Size:                63 - 315

  Power:            0.12 - 315 kW

  Speeds:          3000, 1500, 1000, 750 rpm

  Designs:         IM B3, IM B35, IM B5, IM B14, IM B34 and derived designs according to EN 60034-7

Increased Safety (ec) - formerly nA

The ec protection class is intended for use in Zone 2, i.e., areas in which an explosive gas atmosphere occurs only rarely and for a short time. Special design measures—such as spark-free components, improved insulation, and secure electrical connections—reliably prevent ignition during normal operation. This makes ec a cost-effective solution for less critical Ex areas.

 

Efficiency class:  IE3 or IE4

  Size:                 63 - 450

  Power:              0.06 - 710 kW

  Speeds:            3000, 1500, 1000, 750 rpm

Designs:             IM B3, IM B35, IM B5, IM B14, IM B34 and derived designs according to EN 60034-7

Protection through enclosure (tb)

With protection class tb, all potential ignition sources of the motor are enclosed in a dust-tight housing. The housing prevents explosive dust from entering the interior and coming into contact with hot surfaces or sparks. tb is intended for use in Zone 21 and offers safe operation even in areas at risk of dust explosions.

 

Efficiency class: IE3 or IE4

Size:                  63 - 450

Power:               0.12 - 710 kW

Speeds:             3000, 1500, 1000, 750 rpm

Designs:            IM B3, IM B35, IM B5, IM B14, IM B34 and derived designs according to EN 60034-7

Protection through enclosure (tc)

The tc protection class uses a dust-tight housing to prevent explosive dust from entering the interior of the motor and reaching ignition sources. It is intended for use in Zone 22, where hazardous dust atmospheres occur only rarely and for short periods of time, and offers an economical solution for less critical dust explosion areas.

 

Efficiency class: IE3 or IE4

  Size:      63 - 450

  Power:   0.12 - 710 kW

  Speeds:  3000, 1500, 1000, 750 rpm

  Designs: IM B3, IM B35, IM B5, IM B14, IM B34 and derived designs according to EN 60034-7

Ask our expert

image of Nadine Gerber

Nadine Gerber

Junior Productmanager Drives Contact