Thursday, December 26, 2013

Thursday, December 19, 2013

Monday, December 9, 2013

Circuit breaker accessories - Service releases

Shunt opening release   This allows circuit-breaker opening by means of an electric command. Release operation is guaranteed for a voltage between 70% and 110% of the rated power supply voltage Un, both in AC and in DC. It is always fitted with an auxiliary limit contact.   Under voltage release   This opens the circuit-breaker due to a power...

Friday, November 29, 2013

IEC standards

IEC 60038 Standard voltages IEC 60076-2 Power transformers - Temperature rise IEC 60076-3 Power transformers - Insulation levels, dielectric tests and external clearances in air IEC 60076-5 Power transformers - Ability to withstand short-circuit IEC 60076-10 Power transformers - Determination of sound levels IEC 60146 Semiconductor convertors - General requirements and line...