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Your benefits

Safety integrated
The explosion-proof helical-worm servo gearmotors are fully ATEX-compliant.

Integrate running smoothness
Achieve high dynamics with optimal damping properties for your systems, even in potentially explosive areas.

Space-saving installation
This allows you to plan and implement your system to best utilize your space.

Explosion-proof versions: Dynamic helical-worm servo gearmotors

The explosion-proof version of the S..CMP.. helical-worm servo gearmotors offers maximum safety. It is designed for operation in systems subject to explosion risk and meets all ATEX requirements for equipment group II in category 3.

This enables you to enjoy all the benefits of the S..CMP.. helical-worm servo gearmotors while ensuring maximum safety at the same time. You can count on the explosion-proof helical-worm servo gearmotors to deliver dynamics, running smoothness, and precision. This particularly applies to any of your systems that are based on efficiently linking precise individual steps to build complex processes.

As they are angular drives, they are compact and save installation space. The explosion-proof S..CMP.. gearmotors are designed in such a way that they guarantee a low-noise system environment. Moreover, these drives offer excellent damping properties, so your systems operate with low levels of vibration. This is due to the linear application of force on the input shaft, which efficiently prevents torque impulses and enables high levels of running smoothness and noise reduction.

Certification according to ATEX includes equipment group II and equipment category 3. The combinations are available in II3GD and II3D design.

Contact form Worldwide locations Locations in Germany Worldwide directives and standards TorqLOC® hollow shaft mounting system Adapters Extended Warranty Surface and corrosion protection Lubricants DUO diagnostic unit Brakes and brake control Encoder systems /DUE diagnostic unit option Premium Sine Seal oil seal Other additional features Learn more Explosion-proof helical-worm gear units S series: two stages
  • Gear units comply with Directive 94/9/EC (ATEX), or as of April 20, 2016 of the EU Directive 2014/34/EU (ATEX), equipment group II, equipment category 2, II2GD design
    • For use on the European market
    • Accepted in China
    • Accepted in Russia in conjunction with EAC certificates (successor to GOST-R)
  • Certified protection types:
    • Protection type “c”: Protected by safe construction (design safety), EN13463-1 and -5
    • Protection type “k”: Protected by liquid immersion, EN13463-1 and -8
  • Standardized robust covers as shrink disk covers on the gear unit
  • All screws are secured against automatic loosening
  • Gear unit has a separate nameplate
  • High-quality oil seals
  • Lubricant can withstand high temperatures
  • Significantly more efficient than pure worm gear units due to helical-worm combinations
  • Very low-noise operation
  • Available versions:
    • Foot-mounted or flange-mounted
    • B5 or B14 flange-mounted
    • Solid or hollow shaft
    • Hollow shaft with keyed connection, shrink disk, splined hollow shaft, or TorqLOC®
More on explosion-proof S series helical-worm gear units
Explosion-proof synchronous servomotors CMP.. series
  • Compliant with Directive 94/9/EC (ATEX), or as of April 20, 2016 of the EU Directive 2014/34/EU (ATEX), equipment group II, equipment category 3
    • Category II 3GD, for use in zones 2 / 22
    • Category II 3D, for use in zone 22
    • Also available with brake and Hiperface® encoder (with electronic nameplate) in category 3D
More on explosion-proof CMP.. series synchronous servomotors
S..CMP.. gearmotors
S.. gear unitsCMP.. motors
Gear unit sizeSizeTorque range MaDyn
3750S – 71S18 – 100
4750S – 71M19 – 215
5750S – 80S19 – 365
6750S – 100S40 – 580

Applications in potentially explosive areas with air/gas or air/dust mixtures according to Directive 94/9/EC (ATEX), or as of April 20, 2016 of the EU Directive 2014/34/EU (ATEX).

Gearmotor (directly mounted gearmotor)II3GD
Stand-alone gear units (gear units with adapter AQ)II2GD1/21
Stand-alone CMP.. motorII3GD


  • Food industry
  • Packers/unpackers
  • Palletizers and packaging machines
  • Sorting and stacking systems
  • Cycle feeds