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Thermal magnetic motor circuit breaker.
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.
Both these devices act mechanically on the trip mechanism.
There are two commonly used methods of motor control system used in the industry.
Available for systems up to 600 vac or 250 vdc with current ratings up to 800a.
They install on a standard 35mm din rail and work with a variety of accessories to make wiring as easy as possible.
Thermal magnetic circuit breakers contain two different switching mechanisms a bimetal switch and an electromagnet.
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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 series c circuit breaker is ideal for panelboards switchboards motor control centers and busway applications.
The bimetal serves as a means of handling overcurrents.
However engineers and technicians found some problems coming out with this method.
An mccb provides protection by combining a temperature sensitive device with a current sensitive electromagnetic device.
In case of overload or short circuit the breaker trips opening the circuit and protecting the conductors.
Minimum downtime downtime is reduced and fuse replacement is eliminated with circuit breakers.
The traditional molded case circuit breaker uses electromechanical thermal magnetic trip units that may be fixed or interchangeable.
The basic working principle is similar to all other circuit breakers.
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.
The first component is an electromagnet that is sensitive to large surges in electrical currents.
These are circuit breakers which utilize two components to detect electrical faults.
In american homes today thermal magnetic circuit breakers are the most common type.
Molded case circuit breakers in individual enclosures are also being used in numerous applications.