Considerations regarding testing of low voltage equipment at electrical arc and thermal factor actions

Abstract

Within paper there is made a synthesis of IEC standards requirements for testing at overload and short-circuit currents of low voltage equipment: switches, disconnectors, switch- disconnectors, contactors, fuses and fuses combinations with these.

After this there is presented testing circuit for withstand ability at overload and short-circuit currents passing of low voltage equipment for a large range of currents through realisation of a special circuit for load adjustment. Also are described experiments performed on low voltage fuses

- as type tests - and are established appreciation criteria regarding the behaviour at electric arc action due to overload and short-circuit currents.