Motor protection | circuit breaker | 4-6.3A | 2.2kW | MS132-6.3 | ABB | 1SAM350000R1009

ABB MS132-6.3 motor protection circuit breaker – 3P, 4-6.3A, up to 2.2kW, 400V, DIN

ABB MS132-6.3 – a compact manual motor starter, also known as a motor protection circuit breaker, designed for manual switching, disconnection and protection of three-phase and single-phase motors against overload, short circuit and phase failure. The device has an adjustable 4-6.3A current range, is suitable for motors up to 2.2kW at 400V AC-3 and is mounted on a DIN rail.

• Manual motor switching on and off – clear front rotary handle.
• Overload protection – adjustable in the 4-6.3A range according to the motor rated current.
• Short-circuit protection – high 100kA breaking capacity at 400V AC.
• Phase failure protection – helps protect a three-phase motor from overheating if one phase is lost.
• Integrated disconnect function – can be used as a motor circuit disconnecting device.
• Trip-free mechanism – the device can trip even when the handle is held in the ON position.
• Temperature compensation – more stable protection characteristics when ambient temperature changes.
• Lockable handle – protection against unauthorized switching on or off.
• Accessory mounting option – auxiliary contacts, signalling contacts, undervoltage releases, shunt trips, busbars and power in-feed blocks.

• Pump systems – for protection of water supply, drainage, heating and process pumps.
• Ventilation equipment – for fans, air supply and exhaust systems.
• Compressors – for protection and control of smaller electric motors.
• Production lines – for conveyors, smaller mechanisms and process equipment.
• Heating and ventilation systems – for circulation pumps, fans and auxiliary loads.
• Electrical control cabinets – as a motor protection and manual disconnecting element.
• Commercial and residential buildings – for smaller three-phase or single-phase motor loads.

For example, a 2.2kW three-phase pump has a rated current of around 4.5-5A. In this case, the ABB MS132-6.3 is installed in the electrical cabinet before the motor, and the current adjustment dial is set according to the motor rated current shown on the motor nameplate.

If the motor is overloaded, blocked or one phase is lost, the switch trips and disconnects the motor. After the cause of the fault has been removed, the switch is manually reset to the operating position and the motor can be restarted.

For an electrician: a convenient DIN-mounted solution for motor protection, manual control and safe disconnection. The adjustable current allows the switch to be adapted to different motors whose rated current falls within the 4-6.3A range.

For an automation specialist: it can be supplemented with auxiliary and signalling contacts, an undervoltage release or a shunt trip, making it easy to integrate into automation and safety circuits.

For an industrial specialist: suitable for pumps, fans, compressors, small mechanisms and other loads requiring reliable overload and short-circuit protection.

For a building maintenance specialist: it can be used in heating, ventilation, water supply and other building engineering systems where clear manual motor disconnection and protection are required.

The motor protection circuit breaker must be selected according to the rated current of the specific motor, voltage, starting method and electrical installation design. Incorrectly selected or adjusted protection may cause unnecessary tripping or insufficient motor protection.

• Installation must be carried out by a qualified electrician.
• Before installation, disconnect the power supply and check that there is no voltage in the circuit.
• The current setting must correspond to the motor rated current shown on the motor nameplate.
• The protection must not be set only according to motor power – the actual rated current and motor operating conditions must be evaluated.
• The motor cable, circuit breaker and other installation protection must be selected according to the project.
• Connect the terminals according to the specified conductor cross-section and tightening torque of 0.8-1.2 N·m.
• Before starting a three-phase motor, the phase sequence and direction of rotation must be checked.
• During maintenance, it is recommended to lock the handle in the OFF position to prevent accidental switching on.

Quick selection guide

Choose ABB MS132-6.3 when a motor protection switch with an adjustment range from 4A to 6.3A is required. It is especially suitable for three-phase motors up to 2.2kW at 400V in AC-3 mode, but the final selection must be made according to the motor rated current.

Reliable ABB motor protection for smaller three-phase motors

ABB MS132-6.3 is a compact and professional motor protection circuit breaker designed for motors in the 4-6.3A current range. It combines manual control, overload protection, short-circuit protection and phase failure protection in one device.

Thanks to its 3P design, adjustable current, 100kA short-circuit breaking capacity at 400V, DIN mounting, temperature compensation and the option to use additional accessories, this switch is suitable for pumps, fans, compressors, small production machines and various building engineering systems.