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Magnetic Circuit Breakers

21 products indexed • Avg rating 4.57 • Avg price $57

Magnetic circuit breakers for industrial and electrical maintenance use, including thermal-magnetic and magnetic-only trip devices for overload and short-circuit protection. 21 products indexed with an average rating of 4.57; brands include SIEMENS and Schneider Electric; price range about $32–$112 (avg ~(price varies))

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Frequently Asked Questions

How do I choose the right magnetic circuit breaker for my application?

Match the breaker’s voltage and current ratings to your system, choose the correct pole count (single-, double-, or triple-pole) for phase and neutral requirements, confirm the trip curve and interrupting capacity meet the expected fault current, and pick a physical size and mounting style compatible with your panel or enclosure

What is the difference between magnetic, thermal-magnetic, and electronic trip mechanisms?

Magnetic trip uses instantaneous electromagnetic force to clear short circuits, thermal-magnetic combines a bimetal thermal element for overload protection with a magnetic element for short-circuit protection, and electronic trip units use sensing electronics to provide adjustable protection, time delays, and precision coordination

What specifications should I check to ensure safe short-circuit protection?

Verify the breaker’s interrupting rating (kAIC) is equal to or greater than the maximum available fault current at the installation point, ensure proper coordination with upstream and downstream protective devices, and confirm compliance with relevant standards (for example IEC or UL where applicable)

Are there common mounting and wiring considerations I should know?

Confirm the breaker’s panel or DIN-rail mounting type, required terminal lug or busbar connections, torque specifications for terminals, and whether accessories like auxiliary contacts, shunt trips, or handle ties are needed for your control scheme

How do I maintain and test magnetic circuit breakers to ensure reliability?

Perform periodic visual inspections for overheating, corrosion, and proper physical operation, exercise the breaker by operating it under no-load conditions per manufacturer intervals, and use insulation and trip testing equipment to verify trip characteristics and contact integrity as part of scheduled maintenance

What are typical price ranges and how do I balance cost with performance?

Magnetic and thermal-magnetic breakers commonly span budget options under $50 up to several hundred dollars for higher-voltage or higher-interrupting-capacity models; prioritize interrupting rating, trip performance, and required features over lowest upfront cost for safety-critical applications

Can magnetic circuit breakers be used in motor protection applications?

Magnetic elements provide short-circuit protection for motors, but motors often require thermal or electronic overload protection and coordination with starting inrush currents, so use motor-rated breakers or combine with separate overload relays when necessary