Explosion proof motors

When operating in hazardous areas, there is often a demand for special motors like the explosion proof motors from Hoyer.

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3xPTC in windings
Locked bearing in drive end
Colour RAL 9005 low gloss

Hoyer EX AT/HMCX-motorer
(Zone 1 & 2)


0.09-500 kW

Hoyer EX HMA/HMC-Motorer
(Zone 2 / 22)



ATEX (Directive 2014/34/EU)

EX II 2G Ex db IIC T3/6 Gb
EX II 2G Ex db eb IIC T3/6 Gb
EX II 2G Ex eb IIC T3/T4 Gb

EX II 2G Ex db eb IIB/IIC T4/T5 Gb
EX II 2G Ex db IIB/IIC T4/T5 Gb

EX II 3D Ex tc IIIB T120°C Dc
EX II 3G Ex ec IIC T3 Gc

EX protection class, IECEx

Ex db IIC T3/6 Gb
Ex db eb IIC T3/6 Gb
Ex eb IIC T3/T4 Gb

Ex db eb IIB/IIC T4/T5 Gb
Ex db IIB/IIC T4/T5 Gb

Ex tc IIIB T120°C Dc
Ex ec IIC T3 Gc

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Technical information

Our explosion proof motors are designed according to IEC 60079-0, 60079-1, 60079-7 and 60079-31. They are characterised by high material quality, a robust design and bearings greased for life. 

The motors are low voltage three-phase TEFC motors, and designed in protection enclosure "db". They can be used in zone 1 and 2 in potentially explosive atmospheres in all industries except mining. Hazardous zones exist in industries such as chemical and pharmaceutical production, refineries, offshore platforms and tankers.

Motor series 5AT in aluminium and 7AT in cast iron are certified in conformity with the latest editions of ATEX and IECEx rules and certified by CESI.

All our explosion proof motors in series 5AT and 7AT have the highest explosion group IIC, temperature class T4 at ambient temperatures from -20 to +60 °C.

Have you considered IE3?

IE3 motors from Hoyer are defined by higher energy efficiency than both IE1 and IE2 motors, which offers better opportunities for energy savings.

Have you considered IE4?

IE4 motors from Hoyer are defined by the highest energy efficiency, which offers great opportunities for energy savings.

Hoyer distributor network

In close cooperation with our distributors, we offer the best possible after sales solutions. Find our distributor network here. 

Download catalogue

Find out more about our EX motors in our catalogue.
If you have any questions, please feel free to contact us. Hoyer is always working to maximise your results.


Documentation is key. We have made it easy for you to hand-pick the documentation package you need. Just go to our certificates section.