Circuit breakers

109 companies | 589 products
Air-operated circuit breaker

The SACE Emax 2 is ABB'S...

Air-operated circuit breaker

With a 6,300-A voltage capability,...

Air-operated circuit breaker

The SACE Emax 2 is ABB'S...

Molded case circuit breaker

The new SACE Tmax XT shaped-case...

Power circuit breaker

The BZM circuit breakers series is especially...

Power circuit breaker

The NZM Moulded Case...

Motor protection circuit breaker

Motor Protection Circuit Breaker PKE - Ready...

Motor protection circuit breaker

Motor Protective Circuit Breakers PKZM0 -...

Molded case circuit breaker / low-voltage

According to estimates, more than 30 million molded case circuit...

Molded case circuit breaker / thermal-magnetic / low-voltage

Presenting a top of the line compact design,...

Low-voltage circuit breaker / miniature

The innovative 5SL miniature circuit breaker has the...

Low-voltage circuit breaker / miniature

The 5SY and 5SP Miniature Circuit Breakers (MCB) are...

Thermal circuit breaker / bipolar / rocker switch type

The aspect that makes the difference...

Thermal circuit breaker / single-pole

This product is definitely designed for...

Thermal circuit breaker / single-pole

T11 circuit breakers are one of the ranges...

Magnetic circuit breaker

MS132-T is a circuit breaker for transformer...

The circuit breakers...

DIN-rail circuit breaker

The Bulletin 1492-RCD Residual...

Thermal-magnetic circuit breaker

Bulletin 1489-M thermal-magnetic...

Miniature circuit breaker

The High-Density Circuit...

Vacuum circuit breaker / medium-voltage

The CVB 15/08 series is a vacuum circuit breaker which...

Earth-leakage circuit breaker

The RECmaxLPD Series is an automatic device...

Motorized circuit breaker

Circutor's RECmaxMP are the motorized...

Motorized circuit breaker

The MT-FDE Series is a motor-driven...

Motorized circuit breaker

The MT series motorized...

Vacuum circuit breaker / outdoor

The CG Porcelain Clad VCB is a vacuum...

Vacuum circuit breaker / outdoor

The KIOSK model engineered by CG Power...

Gas-insulated circuit breaker / outdoor

36 kV Outdoor GCB Product Overview The 36kV Outdoor GCB is specially...

Thermal circuit breaker

The W28-XQ1A-0.25,...

Thermal circuit breaker

The W31-X2M1G-1, manufactured...

Thermal circuit breaker

The W33-S1N1Q-15, manufactured...

Thermal circuit breaker

The W51-A121B1-10, manufactured...

Thermal circuit breaker

The thermal circuit...

Vacuum circuit breaker / medium-voltage

The VESA Rolling Stock...

Thermal circuit breaker / auto-reset

The CMBA/CLBA-Series...

Hydraulic-magnetic circuit breaker

The A-Series hydraulic/magnetic circuit breakers are...

Hydraulic-magnetic circuit breaker

The B-Series hydraulic/magnetic circuit...

Hydraulic-magnetic circuit breaker / remotely operated

The C-Series remote operated circuit breaker consists of...

Motor protection circuit breaker

MS25 are switches specifically devised for...

Miniature circuit breaker

The Miniature Circuit Breakers RI 60 feature...

Miniature circuit breaker

The Miniature Circuit...

Miniature circuit breaker

The RI 50 by Iskra Sistemi are miniature...

How to choose this product

circuit-breaker

A circuit breaker is an electrical protection device that cuts power to an electrical cable in case of overvoltage, short circuit or if the circuit presents an isolation defect.

Applications

Circuit breakers are used in industrial facilities to protect circuits and electrical machinery.

Technologies

Thermal circuit-breakers use a bimetallic strip that expands and opens the circuit in the presence of excessive currents. It protects conductors from prolonged over amperage and fire-risks. Magnetic circuit-breakers use a coil, as in relays. They can open the circuit immediately or after pre-set delays (e.g. for motor-starting). Thermal magnetic circuit-breakers combine these two systems. High-end electronic circuit-breakers can be adjusted for extremely precise activation.

Differential circuit-breakers protect against ground leakage. In case of isolation defects, the sum of the phase currents is not equal to the current circulating in the neutral. A magnetic circuit uses this difference to trigger the device. Circuit-breakers interrupt power to electrical supply lines. High-voltage circuit-breakers use gas, oil or compressed air to increase their ability to cut power and extinguish electrical arcs.

How to choose

The main parameters are the rated current (In), well under the trip level (Icu or Icn), beyond which the circuit's integrity is at risk, and the device's class.

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