Optional open deck design
IE2 or IE3 efficiency
Certified according to GB, IEC and EN

Explosion Proof Marine Motors

The range of explosion proof marine motors is designed to meet the challenges of applications operating in hazardous maritime environments.

Frame size
0.37-500 kW
Ex protection ATEX
II 2G Ex db eb IIB/IIC T4 Gb / II 2G Ex db IIB/IIC T4 Gb
Ex protection IECEx
Ex db eb IIB/IIC T4 Gb / Ex db IIB/IIC T4 Gb

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Part number
Frame size
Frame size
Ex protection
Ex protection
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Technical information

Our HMCX explosion proof marine motors are characterised by high material quality and a proven robust design. They are designed according to international standards in conformity with below.

  • GB – 3836.1, 3836.2, 3836.3
  • IEC – 60079-0, 60079-1 and 60079-7
  • EN – 60079-0, 60079-1 and 60079-7/A1

The motors are low voltage three-phase TEFC motors, and designed in protection enclosure „db“. They can be used in zone 1 explosive atmospheres, group of use IIB/IIC covering all industries except mining. In these areas an explosive atmosphere can occur during normal operation (zone 1). Dangerous zones in the marine and oil & gas industries occurs on many vessel and platform types including gas carriers, semi-subs, tankers, FPSO’s, FSO’s, FLNG’s, FSRU’s etc. 

HMCX motors are with cast iron housing, premium quality bearings and provided with ATEX and IECEx certified blind plugs. Motors frame size 80-250 are with closed bearings greased for life while frame size 280-400 comes with re-greasable open bearings. All motor sizes have tropical insulation and are equipped with winding heater and 3xPTC as. As standard motors have C3L coating according to ISO 12944-5:2018 in color RAL 9005 low gloss.

The range is designed to offer flexible product solutions according to customer and application demands. A variety of options are available including Exe protection, larger size motors, special bearings, higher IP class and various measuring systems.

Open deck design option

Open deck applications are often directly exposed to the harsh marine environment. A unique HMCX design is developed to meet the tough demands of open deck operation. It is characterised by a special terminal box and rain cover design including IP 66 protection with the option for IP67 in standstill condition. The open deck motors are especially suitable for below applications which are often installed on LNG / LPG Carriers and Product / Chemical Tankers.

  • Deep well cargo pumps
  • Booster pumps
  • Ballast pumps
  • Fuel pumps
  • Slop pumps
  • Skimming pumps
  • Gas compressors

Application information

Hoyer explosion proof marine motors are used for a wide variety of applications in hazardous areas within the Marine and Oil & Gas markets. Some of the typical applications are:

  • Ballast water treatment systems
  • Compressors
  • Fans
  • Hydraulics
  • Pumps


When it comes to hazardous areas and explosion proof marine motors documentation is everything. Therefore we have made it easy for you to find the essential documentation you need. Just access below links or go explore our full Certificates and Documentation section.

ATEX certificate
IECEx certificate

Let us support you

If you have any questions please get in contact with us. Our team of marine and oil & gas experts as well as technical specialist are ready to assist. You can also complete the contact form below and we will contact you as soon as possible.