PM860K01 3BSE018100R1 ABB AC800M Communication controller I / O module

PM860K01 3BSE018100R1 ABB AC800M Communication controller I / O module

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Standard production breakers can be used with alternating currents with

frequencies other than 50/60 Hz (the frequencies to which the rated performance of the device refer, with alternating current) as appropriate derating

coefficients are applied.

5.2.1 400 Hz networks

At high frequencies, performance is reclassified to take into account phenomena

such as:

• the increase in the skin effect and the increase in the inductive reactance

directly proportional to the frequency causes overheating of the conductors

or the copper components in the breaker which normally carry current;

• the lengthening of the hysteresis loop and the reduction of the magnetic

saturation value with the consequent variation of the forces associated with

the magnetic field at a given current value.

In general these phenomena have consequences on the behaviour of both

thermo-magnetic releases and the current interrupting parts of the circuitbreaker.

The following tables refer to circuit-breakers with thermomagnetic releases,

with a breaking capacity lower than 36 kA. This value is usually more than

sufficient for the protection of installations where such a frequency is used,

normally characterized by rather low short-circuit currents.

As can be seen from the data shown, the tripping threshold of the thermal

element (ln) decreases as the frequency increases because of the reduced

conductivity of the materials and the increase of the associated thermal

phenomena; in general, the derating of this performance is generally equal to 10%.

Vice versa, the magnetic threshold (l3) increases with the increase in frequency:

for this reason it is recommended practice to use a 5·ln version