+7 (495) 374 68 44 Заказать звонок

Область применения

Used in Ex-Zone 2 for

  • Pumps
  • Compressors
  • Fans
  • Centrifuges
  • Branch Oil & Gas


The LOHER VARIO Ex nA series has a welded steel enclosure for the highest degree of variability and versatility. Flange rings at the ends of the enclosure increase the torsional stiffness and ensure a vibration-proof mechanical design. The steel version allows various bearing concepts, dimensions can be adapted and a wide range of instruments can be mounted. The surface cooling using flat ribs combined with a defined inner cooling circuit with shaft-mounted fan inside the motor ensure optimum motor utilization.
The copper bar rotors used as standard allow the starting and operating parameters to be optimized for each and every application.


  • Complies with almost all of the user requirements and specifications (no deviation philosophy)
  • Engineering based on international standards (ATEX, NEPSI, GOST-R 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, pre-purging not necessary with proof according to risk assessment EN 60079-15

Технические данные



Shaft heights:

355, 400, 450, 500, 560

Power range:

90 kW - 2100 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, IP65, IP67

Cooling type:

IC 411, IC 416, IC 71W

Type of construction:

IM B3, IM B35, IM V1


Welded steel


Roller bearings, sleeve bearings



Explosion protection:

II3G Ex nA II T3

Type of protection:
without explosion protection


Noise level:

max. 85 dB(A) (load, 50 Hz), lower noise versions are available

  • Also available for exceptional requirements such as dust explosion protection.
  • Corrosion protection using special paint finishes according to the manufacturer's standard or customer's specification.
  • The motors are available as special version for polar regions down to -40 °C (without pre-heating of the motor) or desert regions up to +60 °C.
  • When required, vertical motors can also be equipped with thrust bearings for high axial and radial loads.
  • Wide range of connection systems for large cable cross-sections, high short-circuit strength or phase-segregated version.
  • Optimized starting and operating parameters and high efficiency by using copper bar rotors as standard.
  • With water jacket cooling IC 71W up to 60 % higher power density - compact and low noise. Admirably suited for converter operation with constant load torque.