MS132-20 Motor starter switch 1SAM350000R1013

Motor protection circuit breakers – reliable protection for your drives

Motor protection circuit breakers are a key element in protecting electric motors, safeguarding them against overload, short circuit, and phase failure. Model MS132-20, with a rated current of 20A, combines compact dimensions and high performance, proving effective in both professional and domestic installations. This device is designed to operate in three-phase networks with a rated voltage of 250…690V and provides protection for motors up to 7.5 kW at 400V.

Construction and functionality

The MS132-20 circuit breaker is a complete device in a housing, ready for mounting. Its construction is based on the thermomagnetic principle – the thermal release responds to overloads, and the electromagnetic release to short circuits, ensuring a quick and effective response in the event of a failure. Additional sensitivity to phase failure increases the safety of motor operation, minimizing the risk of damage caused by voltage asymmetry. The rated short-circuit breaking capacity Icu is as high as 100 kA at 400V AC, guaranteeing reliable operation even in difficult operating conditions. The adjustable setting range of the overload release (16…20A) allows for precise adaptation to the load characteristics.

Mounting and application

Compact dimensions (45 mm width, 97.8 mm height and 86.55 mm depth) facilitate mounting the circuit breaker in tight switchboards. Screw connection of the main contacts ensures a secure and durable connection of the wires. The MS132-20 circuit breaker finds application in a wide range of applications – from protecting motors of pumps, fans and compressors, to protecting drives of industrial machines. It is a universal solution for installers and end-users looking for reliable protection of their electrical equipment. It is important to select the correct setting current of the overload release in relation to the rated current of the motor – it is recommended to set it to approx. 110% of the motor's rated current (Iwył = I z x 1.1).