Mini Circuit Breakers

Miniature circuit breakers (MCB) are electrical switches that are designed to trip during a short circuit or overload to protect against electrical faults and equipment failure. Overload protection is accomplished through a thermal operation with a slight time delay. When an overcurrent passes through an MCB, a bimetallic strip is heated and bends. The bending causes a mechanical latch to release, opening the MCB contacts, halting the flow of current. When the overcurrent is removed, the contacts close and the MCB is reset. Short circuit protection is accomplished through an electromagnetic operation that is instantaneous. A current coil is tripped causing the mechanical release of the latch that opens the contacts that halt the flow of current. When the overcurrent is removed, the MCB can be reset.

Miniature circuit breakers have a current rating less than 100 amps and have an interrupting rating less than 18,000 amps. They come in different types according to their tripping or overcurrent characteristics. The three main types, B, C and D can be selected based on their response to different electrical surges in different settings.

Type B trip if the current flowing through is between three and five times the recommended rated load. These are the most sensitive and are best for low voltage settings where current surges are likely to be small.

Type C trip if the current flowing through is between five and ten times the recommended rated load. These are best for industrial and commercial environments where surges are likely to be higher. 

Type D trip if the current flowing through is between ten and twenty times the recommended rated load. These are the least sensitive and are best for heavy-duty industrial and commercial devices where very strong surges occasionally occur.

Products

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$40.90
Phoenix Contact 1115661 Power module with status output and reset input for supplying the CAPAROC circuit breaker system with 12 or 24 V DC. For DIN rail installation via the CAPAROC current rails.
$460.95
Phoenix Contact 1110986 Power module with PROFINET interface for supplying the CAPAROC circuit breaker system with 12 or 24 V DC. Additional system interface for communication with the power supply. For DIN rail installation via the CAPAROC current rails.
$114.45
Phoenix Contact 1115670 Power module with IO-Link interface for supplying the CAPAROC circuit breaker system with 12 or 24 V DC for up to 20 channels. For DIN rail installation via the CAPAROC current rails.
$26.20
Phoenix Contact 1110987 Potential distributor with Push-in connections for directly connecting the 0 V return conductor in the CAPAROC system. For DIN rail installation via the CAPAROC current rails.
$135.45
Phoenix Contact 1115657 Four-channel electronic circuit breaker module for protecting 12 and 24 V DC loads against overload and short circuit. Nominal current adjustable from 1 A to 4 A via LED button. For DIN rail installation via the CAPAROC current rails.
$135.45
Phoenix Contact 1115658 Four-channel electronic circuit breaker module for protecting 12 and 24 V DC loads against overload and short circuit. Nominal current adjustable from 1 A to 10 A via LED button. For DIN rail installation via the CAPAROC current rails.
$104.95
Phoenix Contact 1110984 2-channel electronic circuit breaker module for protecting 12 and 24 V DC loads against overload and short circuit. Nominal current adjustable from 2 A to 10 A via step switch. For DIN rail installation via the CAPAROC current rails.
$104.95
Phoenix Contact 1115655 2-channel electronic circuit breaker module for protecting 12 and 24 V DC loads against overload and short circuit. Nominal current adjustable from 1 A to 4 A via step switch. For DIN rail installation via the CAPAROC current rails.
$52.45
Phoenix Contact 1157279 1-channel electronic circuit breaker module for protecting 12 and 24 V DC loads against overload and short circuit. With fixed nominal current. For DIN rail installation via the CAPAROC current rails.
$52.45
Phoenix Contact 1157286 1-channel electronic circuit breaker module for protecting 12 and 24 V DC loads against overload and short circuit. With fixed nominal current. For DIN rail installation via the CAPAROC current rails.
$52.45
Phoenix Contact 1157285 1-channel electronic circuit breaker module for protecting 12 and 24 V DC loads against overload and short circuit. With fixed nominal current. For DIN rail installation via the CAPAROC current rails.
$52.45
Phoenix Contact 1157290 1-channel electronic circuit breaker module for protecting 12 and 24 V DC loads against overload and short circuit. With fixed nominal current. For DIN rail installation via the CAPAROC current rails.