Three-Phase TEFC Induction Motor, B3 Mounting

The MBH125C 31/55 is a rugged industrial-grade three-phase induction motor designed for continuous and efficient operation in demanding environments. With a power output of 5.5 kW (7.4 HP) and running at ~2900 RPM (2-pole), this motor supports a standard supply of 400 V at 50 Hz and is optionally available for 60 Hz systems. Housed in a durable cast iron frame (IEC 125 size) and featuring a B3 mounting arrangement, it is ideal for horizontal installations in industrial machinery, pumps, compressors, or blowers.

This motor is built to TEFC (IC411) standards, providing robust protection against dust and water jets (IP55). The insulation is rated Class F, with a winding temperature rise limited to Class B for long service life. High efficiency is ensured with an IE2 classification or optional IE3 for premium performance. Flameproof versions are available for hazardous zones (Zone 1 or Zone 2), with certifications per ATEX II 2G Ex db IIC T4 Gb.

Its reliable operation across a wide ambient temperature range and at altitudes up to 1000 m makes it suitable for a variety of industrial applications requiring durability, efficiency, and safety.

Specifications:

– Motor Model: MBH125C 31/55
– Type: Three-Phase Induction Motor
– Frame Size: IEC 125
– Mounting Arrangement: B3 (horizontal foot-mounted)
– Cooling Method: IC411 (Totally Enclosed Fan Cooled – TEFC)
– Protection Class: IP55 (dust and water jet protected)
– Construction: Cast Iron Body
– Rated Power Output: 5.5 kW (7.4 HP)
– Rated Voltage: 400 V ±10%
– Rated Frequency: 50 Hz (optional 60 Hz)
– Rated Speed: ~2900 RPM (2-pole motor)
– Direction of Rotation: Clockwise (viewed from drive end; reversible)
– Insulation Class: Class F (temperature rise limited to Class B)
– Service Factor: 1.15
– Efficiency Class: IE2 (optional IE3)
– Power Factor: 0.85–0.89
– Ambient Temperature Range: -20°C to +40°C
– Altitude Limit: ≤1000 meters above sea level
– Gas Group: IIB or IIC
– Temperature Class: T4 (135°C max surface temperature)
– Zone Classification: Zone 1 or Zone 2
– Certification: ATEX II 2G Ex db IIC T4 Gb (if flameproof rated)
– Normal Operating Inlet Temperature: Ambient (~25°C)
– Normal Operating Outlet Pressure: N/A (not pressure-retaining)
– Upper Design Temperature: +155°C winding temperature
– Normal Operating Pressure: Atmospheric
– Length: ~550 mm
– Width: ~280 mm
– Height: ~330 mm
– Weight: 65–85 kg (depending on options)

For further specifications or to inquire about this equipment and ReflowX's logistics services, please contact ReflowX at info@reflowx.com