Magnetic Circuit Breaker

Magnetic circuit breakers trip on an electromagnetic coil that reacts to fault current almost immediately, without waiting for a bimetal strip to heat up and bend the way a thermal breaker does. OEMs put them in when a fault has to be cleared fast enough to protect a drive or supply downstream, when a panel schedule calls for magnetic-only trip on a motor branch, or when a thermal unit keeps tripping late.

 

As an authorized electrical distributor for multiple manufacturers, we stock magnetic breakers from Schneider Electric, Sprecher & Schuh and Square D across competing lines, in ratings up to 630 A, so you can order a drop-in match for a panel already built around one of those lines, compare ratings and enclosure options across brands, and hold the trip curve the schedule specifies. Same-day shipping on in-stock items ordered before 2pm local time.