Thermal Magnetic Circuit Breaker Schematic

Bulletin 1489 m thermal magnetic circuit breakers are ul 489 listed for branch circuit protection in the united states and canada and they are certified as miniature circuit breakers for iec applications.

Thermal magnetic circuit breaker schematic. The thermal unit is comprised of a bimetal element located behind the circuit breaker trip bar and is part of the breaker s current carrying path. These are circuit breakers which utilize two components to detect electrical faults. The thermal trip unit protects against a continuous overload. Thermal circuit breakers are also available as self resetting which in some unusual circumstances could also be a deciding factor.

These circuit breakers are ideal for extreme ambient conditions feature fast breaking time and superior shock and vibration resistance. Thermal magnetic circuit breaker 2210 s2. The bimetal serves as a means of handling overcurrents. Designed for panel or plug in mounting.

Circuit breakers may also use the higher current caused by the fault to separate the contacts such as thermal expansion or a magnetic field. Thermal magnetic circuit breakers contain two different switching mechanisms a bimetal switch and an electromagnet. Small circuit breakers typically have a manual control lever to switch off the load or reset a tripped breaker while larger units use solenoids to trip the mechanism and electric motors to restore. In american homes today thermal magnetic circuit breakers are the most common type.

Magnetic circuit breakers have slightly higher interrupt capacity when running dc loads and some are also rated for either ac or dc currents.