Thermal Magnetic Motor Circuit Breaker

Thermal magnetic circuit breakers contain two different switching mechanisms a bimetal switch and an electromagnet.

Thermal magnetic motor circuit breaker. The conventional method is the 3 component system where circuit breaker magnetic contactor and thermal overload relay are installed to control and protect the motor. The first component is an electromagnet that is sensitive to large surges in electrical currents. Thermal magnetic circuit breakers which are the type found in most distribution boards in europe and countries with a similar wiring arrangements incorporate both techniques with the electromagnet responding instantaneously to large surges in current short circuits and the bimetallic strip responding to less extreme but longer term over current conditions. Molded case circuit breakers in individual enclosures are also being used in numerous applications.

In case of overload or short circuit the breaker trips opening the circuit and protecting the conductors. The series c circuit breaker is ideal for panelboards switchboards motor control centers and busway applications. Both these devices act mechanically on the trip mechanism. The basic working principle is similar to all other circuit breakers.

The majority of circuit breakers are thermal magnetic which means they accomplish electrical protection by combining two mechanisms that respond to heat and magnetic fields respectively. Thermal protection is used to guard the electric motor against overload. However engineers and technicians found some problems coming out with this method. The motor protection circuit breaker can be considered a subtype of a thermal magnetic circuit breaker but with additional functions that are specially designed to protect electric motors.

These are circuit breakers which utilize two components to detect electrical faults. C3controls series 330 motor protection circuit breakers provide reliable overload and short circuit protection for all your motor control applications and are ideal for use in multi motor applications. The bimetal serves as a means of handling overcurrents. Available for systems up to 600 vac or 250 vdc with current ratings up to 800a.

Contact me about this product. Choose from a premier selection of trip units including thermal magnetic electronic and magnetic only switches. They install on a standard 35mm din rail and work with a variety of accessories to make wiring as easy as possible. The traditional molded case circuit breaker uses electromechanical thermal magnetic trip units that may be fixed or interchangeable.

In american homes today thermal magnetic circuit breakers are the most common type.