BFGC4 Series – Ex d(e) IIC T4 Gb (Ex tb IIIC T125ºC Db IP6X)


BFGC4 is one of WEG flameproof TEFC three phase motors lines for IIC group of gas and combustible dust and is available for shaft height 250 up to 315M.

BFGC4 line is available for Low voltage with the following powers:

BFGC4 – Low voltage (≤ 690 V 50 Hz):

Powers (kW) Speed
55 up to 132 3000 RPM
55 up to 132 1500 RPM
37 up to 90 1000 RPM
37 up to 75 750 RPM

BFGC4 – Low voltage (≤ 690 V 60 Hz):

Powers (kW) Speed
66 up to 158 3600 RPM
66 up to 158 1800 RPM
44 up to 108 1200 RPM
36 up to 90 900 RPM

This range of motors complies with efficiency classification code IE2 as established in IEC 60034-30.

In relation to the different available optionals, BFGC4 motors are designated as follows:

  • BFGC4 – Standard Ex d IIC T4 Gb motor
  • BFGCE4 – Ex d e IIC T4 Gb motor
  • BFGCD4 – Ex d IIC T4 Gb and Ex tb IIIC Db IP6X motor
  • BFGCED4 – Ex d e IIB T4 Gb and Ex tb IIIC Db IP6X motor

Particular specifications related to Hazardous Areas

This motor series has the CE marking in compliance with European Directive 94/9/EC (ATEX) and in accordance with the following standards:

  • EN 60079-0: Explosive Atmospheres – Part 0: Equipment – General requirements
  • EN 60079-1: Explosive Atmospheres – Part 1: Equipment protection by flameproof enclosure ‘d’
  • EN 60079-7: Explosive Atmospheres – Part 7: Equipment protection by increases safety ‘e’
  • EN 60079-31: Explosive Atmospheres – Part 31: Equipment dust ignition protection by enclosure ´t’

and is classified as equipment Group II (Surface Industries), suitable to use on the following zones:

  • category 2, for Zones 1 and 21 – Gases, Vapours and Dust (GD).
  • category 3, for Zones 2 and 22 – Gases, Vapours and Dust (GD).;

As standard, BFGC4 motors are supplied for Zone 1 application – IIC Group of Gases and Temperature class T4 (under request T5 is available).

As standard execution, BFGC4 motors are fitted with flameproof terminal boxes for gases of Group IIC, with specification code Ex d, IIC. Under request and as an alternative execution, these motors can be fitted with an Increased Safety terminal box. In this case the description code is Ex de, IIC. These flameproof motors are certified according to the above standards, by the EU accredited Notified Body INERIS in France.

Main standard construction

  • Mechanical protection: IP55
  • Insulation: Class F
  • Temperature rise: 80 K
  • Frames: are in cast iron
  • Terminal boxes: are in cast iron
  • Endshields: are in cast iron
  • Fans: Aluminum alloy
  • Fan cover:pressed steel, capable to withstand impact of 7 Joule.
  • Finish: polyurethane paint scheme 212P, standard color RAL 7001.

Main construction optionals

  • Mechanical protection: IP56, IP65 and IP66
  • Insulation: Class H
  • Temperature rise: 105 K
  • Frames: Welded construction
  • Terminal boxes: Welded construction
  • Endshields: Welded construction
  • Fans: Steel

Several optional features are available for BFGC4 line. Please requrest the full scope to WEGeuro.

Voltage and frequency

As standard, these motors are wound to operate on Δ 400 V – 50Hz. As an option Δ 460 V – 60Hz is available.

Other supply voltages and frequencies can be supplied under request.

BFGC4 line is also available for VSD application.

Motors are manufactured within the tolerances given by IEC 60034-1.

Ambient temperature and altitude

BFGC4 standard motors are manufactured for an ambient temperature -20ºC up to +40ºC and altitude up to 1000m. As an option motors can be executed for an ambient temperature up to +60ºC and altitude up to 5000m.

Basic design

  • Cooling method:
    IC 411 in accordance with standard IEC 60034-6 – motors cooled by an external fan.
  • Direction of rotation:
  • Electrical connection:
    The terminal boxes are provided with 6 terminals, to connect the motors to the mains supply, allowing the star/delta starting.
  • Terminal boxes:
    The main terminal box is located at top of motor frame and can be rotated by 180º to suit cable entry from left or right hand side. As standard, the supply cable entries are on the left hand side when viewed from shaft end. Note: customer must refer cable entry direction with order.
  • Protections/Auxiliaries:
    As standard the BFGC4 motors are fitted with 3 PTC thermistors, (triple, 2 wire), connected in the main terminal box. Under request the motors can be fitted with anti-condensation heaters or other type of protections on windings and connected into auxiliary terminal box.
  • Earth connection:
    All motors are equipped with an earth connection inside of terminal box. A second external earth connection is also provided on motor frame, on foot or on flange, depending on mounting form.
  • Terminal box entries and cable glands:
    As standard, the motors are not supplied with cable glands and the number of entry holes and respective dimensions are described on outline dimensions tables. However, considering that the cable entry makes part of the protection enclosure it is recommended that the motors are supplied from factory fitted with cable glands. For this it is necessary to specify with the order the complete cabling details (number of cables, specification, section and diameters), so that the motors can be supplied from factory fitted with suitable glands.
  • Bearings:
    The BFGC4 motors are equipped with deep groove ball bearings in both sides for horizontal and vertical mounting forms. For horizontal motors is available roller bearing execution in drive end side defined according to the radial loads involved on the application. For vertical motors is available angular contact bearing execution in drive end side defined according to the axial loads involved on the application.
  • Lubrication:
    The motors are equipped with grease relief valves and relubrication nipples.
  • Balancing:
    The motors are dynamically balanced with half-key to meet the vibration limits of standard IEC 60034-14, Grade A. Grade B can be provided under request.