PFSK130 3BSE002616R1 ABB Module channel control board

PFSK130 3BSE002616R1 ABB Module channel control board

PFSK130 3BSE002616R1 ABB Module channel control board

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Circuit-breaker

A mechanical switching device, capable of making, carrying and breaking

currents under normal circuit conditions and also making, carrying for a specified

time and breaking currents under specified abnormal circuit conditions such as

those of short-circuit.

Current-limiting circuit-breaker

A circuit-breaker with a break-time short enough to prevent the short-circuit

current reaching its otherwise attainable peak value.

Plug-in circuit-breaker

A circuit-breaker which, in addition to its interrupting contacts, has a set of

contacts which enable the circuit-breaker to be removed.

Withdrawable circuit-breaker

A circuit-breaker which, in addition to its interrupting contacts, has a set of

isolating contacts which enable the circuit-breaker to be disconnected from

the main circuit, in the withdrawn position, to achieve an isolating distance in

accordance with specified requirements.

Moulded-case circuit-breaker

A circuit-breaker having a supporting housing of moulded insulating material

forming an integral part of the circuit-breaker.

Disconnector

A mechanical switching device which, in the open position, complies with the

requirements specified for the isolating function.

Release

A device, mechanically connected to a mechanical switching device, which

releases the holding means and permits the opening or the closing of the

switching device.

Fault types and currents

Overload

Operating conditions in an electrically undamaged circuit which cause an overcurrent.

Short-circuit

The accidental or intentional connection, by a relatively low resistance or

impedance, of two or more points in a circuit which are normally at different

voltages.

Residual current (I?)

It is the vectorial sum of the currents flowing in the main circuit of the circuitbreaker.