Electric Motor Control using Fuji Manual Motor Starters
Manual Motor Starter Advantages
The BM3 Series manual motor starters (MMS) provide optimal protection by integrating the functions of a molded case circuit breaker (MCCB) and thermal overload relay into a highly compact unit. The BM3 Series manual motor starters (MMS) provide magnetic short circuit protection. This short circuit trip rating is approximately 13 times the FLA rating of the overload function.
We offer compact motor starters with a 55mm width for rated currents to 63A and motor capacities to 30kw (40Hp) at 480 VAC.
Thermal overload relay plus: - Phase-loss protection - Rated current adjustment - Ambient temperature compensation
Compact Mounting Space) - MCCB + Thermal overload relay: 100% - MMS: 43% (57% reduction)
Considerable space is required to install a back-up circuit breaker or a combination starter consisting of a circuit breaker and a thermal overload relay. As a result, the panel size has to be increased..The compact size of the MMS, including thermal overload relay functions, enables a smaller installation area with less wiring space, for a reduction in panel size.
High breaking capacity - 50, 100 kA 400 VAC. NOTE: See specific ratings for each manual motor starter at the operating voltage.
IEC short circuit protective coordination - IEC 60947-4-1 Type 1, 2
Reduction in wiring: - MCCB + Contactor + Thermal overload relay: 100% - MMS + Contactor: 50% (50% reduction)
Standards: - UL 508, CSA C22.2 No.14, IEC 60947-1, 60947-2, 60947-4-1
Ecologically friendly design
- Recyclable thermoplastic resin used in plastic parts
- Indication of materials used
- Cadmium-free contacts
Two different frame sizes:
- 32A frame for the 45mm width - 63A frame for the 55mm width
Rotary handle operators - ON/ OFF and trip state indication for all frames
International standards/approvals: - IEC, cULus, CE, RoHS, EU reach
Manual Motor Starter Applications
When numerous small and medium motor loads exist in a circuit requiring high breaking capacity, there is no high-breaking capacity circuit breaker with a small rated current for short-circuit protection.
The manual motor starter can be used in 100 kA short-circuit current circuits for three-phase, 240 V motors with rated capacity up to 15 kW, and in 50 kA short-circuit current circuits for three-phase, 415 V motors with rated capacity up to 30 kW.
When a back-up molded case circuit breaker (MCCB) is installed upstream to solve the problem described in "short-circuit breaking protection" above, a short in one of the load circuits also trips the upstream breaker and stops the other operating load circuits.
Despite their compact size, the 32AF and 63AF MMS provide high-performance short-circuit current breaking. They eliminate the need for an upstream circuit breaker for back-up use.
Further details are available below: