Automatic circuit breakers series VA57-39 are designed to carry current in normal mode and disconnect current at short circuits, overloads, as well as for infrequent operational switching on and off of electrical circuits. This is a series of circuit breakers for currents from 250 to 630A, with rated voltage up to 660 V AC and 440 V DC, with a maximum breaking capacity of up to 85 kA and the most popular on the market range of protection settings in the zone of short-circuit currents from 1250 to 6300A.
According to the method of installation the circuit breakers have stationary and withdrawable version.
Circuit breakers have:
- warranty period of 5 years;
- increased service life up to 15 years due to increased wear resistance (for VA57-39 - 16000 mechanical cycles, 2000 electrical cycles);
- reliability is evaluated by probability of failure-free operation when performing switching operations at load currents and without load currents, as well as when performing protective functions.
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