Busck MS 100LB-4 B5 3-Phase Motor

Busck MS 100LB-4 B5 3-Phase Induction Motor (4kW, 230/400V, 50Hz, Frame 100L)

The Busck MS 100LB-4 B5 is a three-phase squirrel-cage asynchronous AC induction motor engineered in a lightweight, high-tensile die-cast aluminum frame. Rated for continuous S1 duty with an output of 4.0 kW (5.5 HP) across standard 50 Hz power networks, this 4-pole motor operates at a nominal synchronous speed of 1,500 RPM (~1,435–1,450 RPM full load). Configured with a standard IEC B5 large mounting flange (FF215 / 250 mm OD), it mounts directly to close-coupled centrifugal pumps, maritime deck machinery, industrial gear reducers, hydraulic power units (HPUs), and ventilation blowers.

Built to IEC 60034 standards, this drive incorporates an IP55 ingress-protection enclosure, Class F insulation with a Class B temperature-rise profile for thermal safety, and sealed deep-groove C3 ball bearings on both the drive end (DE) and non-drive end (NDE).

Technical Specifications

Features

1. Optimized Power-to-Weight Envelope: High-grade die-cast aluminum frame reduces total motor weight to ~25 kg while retaining structural rigidity against vibration.
2. High Thermal Headroom: Built with Class F insulation but operated at Class B temperature rise, protecting the winding varnish from premature breakdown in elevated ambient temperatures.
3. Precision B5 Flange Interface: Standard 250 mm outer diameter B5 flange with 215 mm pitch circle diameter provides rigid alignment with gearhead input faces and centrifugal pump adapters.
4. Maintenance-Free Bearing Arrangement: Fitted with pre-greased, sealed deep-groove 6206-2RS-C3 bearings engineered for radial thrust loads and high rotational smoothness.
5. Dual-Voltage Versatility: 6-stud terminal block allows quick field transition between 230V Delta and 400V Star supplies or dedicated industrial VFD configurations.

Motor Compatibility

The Busck MS 100LB-4 B5 follows IEC 60072-1 dimensional standards, making it directly interchangeable with standard 100L frame B5 flange-mounted motors from manufacturers like ABB (M2AA / M3AA 100L), Siemens (1LE1001-1AB4 / SIMOTICS GP 100L), WEG (W22 Aluminum 100L), SEW-Eurodrive, and VEM.

It serves as direct-drive replacement power on equipment including:

• Industrial Gearboxes: Bonfiglioli (W/VF, C, A series), SEW-Eurodrive (R/F/K series with IEC adapter), Nord SK series, Motovario NMRV 090/110.
• Pumps: Desmi, Allweiler, Grundfos, and Lowara flange-mounted in-line circulating, seawater ballast, and bilge transfer units.
• Air Systems: Atlas Copco, Kaeser, and Tamrotor rotary screw intake auxiliaries and marine hull ventilation blowers.

Frequently Asked Questions

Can this motor be connected for Star-Delta (Y/Δ) soft starting on a 400V grid?

No. Because the individual phase windings are rated for 230V, connecting this motor in Delta requires a 230V supply. To use standard Star-Delta starting on a 400V grid, a motor with 400V Delta / 690V Star windings is required. For this motor on a 400V grid, start Direct-on-Line (DOL) in Star or use a soft-starter/VFD.

What is the distinction between B5 and B14 flanges?

The B5 flange featured on this motor has an outer diameter larger than the motor casing (250 mm OD for frame 100L) with clearance holes drilled through the flange for through-bolts. A B14 flange (“face-mount”) has a smaller overall diameter (usually 160 mm for 100L) with threaded blind holes in the face.

Can this motor run safely on a 60Hz marine grid?

Yes. Operating on 460V 60Hz causes the synchronous speed to increase by 20% to 1,800 RPM (nominal speed around 1,730–1,740 RPM). Check driven machinery performance (especially centrifugal pumps/fans) to ensure that the higher operating speed does not overload the 4.0 kW power envelope.

What size cable gland fits the terminal box?

The terminal box has standard M25 × 1.5 threaded entries, accommodating marine and industrial armored or non-armored cables with overall outer diameters between 11 mm and 17 mm.