When an electrical arc occurs in switchgears it can cause thermal damage to equipment and injury to personnel. The damages are directly proportional to the arc burning time. Arc monitor ZELK-2 rapidly recognizes electrical arc and trips the circuit breaker in order to disconnect feeding of the arc. By using an optical sensor for arc detection and static output, arc protection operates instantaneously in less than 1ms, which is negligible in comparison with disconnection time of a circuit breaker.That feature enables early arc recognition, and greatly decreases possible damages.
Arc protection system gives high contribution in protection of personnel and equipment with low price and simple application. Because of that a lot of European producers of medium and low voltage switchgears with air insulation apply devices for arc protection.
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- high speed tripping (in less than 1ms)
- optical arc detection, with max. 6 detectors
- functionality 250ms after auxiliary power supply failure
- AC or DC auxiliary power supply
- local and remote indication of power supply failure and tripping
- indication of fault location on digital display
- static output can be supplied with AC or DC supply
- galvanical insulation 2,5kV between all insulated circuits
- small dimensions and simple mounting on rail DIN EN 50022-35
- selective protection realized with ZELK-2, ZELK-3, IM, SM ensures maximal availability when electrical arc occurs
- ZELK-2 is an optimal solution for monitoring smaller number of arc detectors in busbars, bus couplers and switchgear panel compartments
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