Carretera Estatal 431, Km. 5.8 - Parque Industrial PYME, Avenida Mecanica. Querétaro, México.
+52 5594188000





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The motors in the “increased safety” version offer a high degree of explosion protection but at the same time have a low weight and are complex.
The copper bar rotors used as standard allow starting and operating parameters to be optimized for each and every specific application. The steel version allows various bearing concepts, dimensions can be adapted and a wide range of instruments can be mounted.

3 versions are available:
The LOHER VARIO Ex e series is surface cooled with flat ribs combined with a defined inner cooling circuit with internal shaft-mounted fans.
The LOHER VARIO PLUS Ex e series from Loher have a modular cooling design featuring double flow inner cooling for a high power density and a homogeneous temperature distribution in the following versions:

Mounted air-water heat exchanger:

The heat exchangers are available in a wide range of versions with single and double pipe versions.

Mounted air-air heat exchanger:

The cooling pipes are manufactured out of galvanized steel; stainless steel versions are available for especially aggressive atmospheres.


Complies with almost all of the user requirements and specifications (no deviation philosophy)

Configuration based on international standards (ATEX, GOST-R, Rostechnadzor certified)

High level of acceptance in the various sectors. For instance, Shell and DOW recommend these motors

Complete project documentation guarantees minimum planning costs

High degree of cost effectiveness and low operating costs as a result of the optimum electrical and mechanical values

High degree of variability and versatility using a welded steel enclosure (to adapt the dimensions, mounted components)

Up to 11 kV in IIC, pre-purging not necessary with proof according to risk assessment EN 60079-7 (rotor)

Technical specifications

Motors: EN.U (Vario-T2), EN.V (Vario-T3), JN.U (T2), JN.V(T3) / MLFB: 1PS2
Shaft heights: 355, 400, 450, 500, 560, 630, 710, 800
Power range: 90 kW – 4500 kW
Number of poles: 2 – 16 poles,
higher pole numbers on request
Voltage range: 380 V – 950 V
Rated voltage: 380 V / 400 V / 415 V / 500 V / 660 V / 690 V
Frequency converter: Line and converter operation
Degree of protection: IP55, IP56
Cooling type: IC 411, IC 416, IC 511, IC 516, IC 611, IC 616, IC 666, IC 71W, IC 81W, IC 86W
Type of construction: IM B3, IM B35, IM V1
Enclosure: Welded steel
Bearings: Roller bearings, sleeve bearings
Standards: IEC, EN, DIN, VDE
Explosion protection: II2G Ex e II T2 , II2G Ex e II T3
Type of protection:
without explosion protection
Noise level: max. 85 dB(A) (load, 50 Hz), lower noise versions are available