Explosion Proof Motors – EEx d / EEx de (ATEX) – Standard Efficiency – IE1


Environments containing flammable gases or vapour continuously, intermittently or periodically in enough amount to generate explosive or flammable mixtures arising out of repairs or maintenance services.

The most common locations of Zone 1 and 2, group IIA and IIB are those where the following gases are found present: oil, naphtha, benzene, ammonia, propane, diethylic ether, acetone, alcohol, industrial methane, natural gas.

The main applications include fans, blowers, crushers, conveyor systems, mills, cranes and other applications located in areas that require explosion proof motors

Standard Features

  • Output: 0.55 up to 315kW
  • Multivoltage – (220-240/380-415//440-460V or 380-415/660-690//440-460V)
  • Self Ventilated (TEFC)
  • EFF2 Improved Efficiency
  • Cast iron frame: 90S up to 355M/L
  • Mounting: B3T
  • Degree of Protection: IP55
  • Squirrel cage rotor/Aluminium die cast
  • Stainless steel nameplate AISI 316
  • Class of temperature T4
  • Class “F” insulation with T 80K
  • Continuous duty – S1
  • Ambient temperature: 40°C , 1000 m.a.s.l.
  • Regreasing nipples from frame 225S/M and above
  • Thermistors 150ºC – 1 per phase
  • Metric thread cable entries in terminal box
  • Hardened set screws
  • Internal DE and NDE bearing cap to prevent flame propagation
  • Machined metal to metal surfaces between frame and terminal box
  • Earth lug inside the terminal box
  • Suitable for Inverter Duty applications*
  • Epoxy based paint plan: RAL 5010

*For additional details about Inverter operation, please contact our technical suport. x

Optional Features

  • Single voltage (other voltages)
  • Increased safety terminal box (for EEx de motors)
  • Degree of Protection: IP56, IP65 or IP66
  • Other mounting configurations
  • Thermal protection:
    – RTD-PT 100 Space heaters
  • Space heaters


IEC Standard:
Zone 1; Group IIB

CENELEC Standard:
Group IIB; Category 2

Note:The classification in Zone 1 means that the motor is suitable to operate also in Zone 2 once Zone 1 represents an operating condition worse than Zone 2. The same applies to Groups and Categories: EEx d and EEx de motors are suitable to operate also in Group IIA and Category 3.


In Europe, WEG explosion proof motors meet ATEX Directive 94/9/EC certified by PTB and product certified by CESI -Centro Elettrotecnico Sperimentale Italiano S.P.A. The CESI certificates of conformity for explosion proof in flameproof enclosure “d” and “de” as per EN50014 / EN50018 are:

  • EEx-d: Explosion proof motors (class of temperature T4)
  • EEx-de: Explosion proof motors with increased safety terminal box (class of temperature T4)
Frames Certificate number
90-100 CESI 01 ATEX 096
112-132 CESI 01 ATEX 097
160-200 CESI 01 ATEX 098
225-250 CESI 01 ATEX 099
280-315 CESI 01 ATEX 100
355 CESI 01 ATEX 101