Low-voltage switchgear are devices which provides short-circuit and overload protection through low-voltage power circuit breakers (LV-PCB) with integral trip units.
PD IEC/TR 61912-2 is a technical report, which serves as an application guide for the determination of selectivity between over-current protective devices of low-voltage switchgear and controlgear, summarises the definitions of the terminology and provides examples of application.
PD IEC/TR 61912-2 on low-voltage switchgear and controlgear is useful for:
Having access to reliable guidelines is essential to prepare and use quality low-voltage switchgear and controlgear. PD IEC/TR 61912-2 provides manufacturers with the scope of selectivity requirements, selectivity determination terms along with the definitions and abbreviated terms which allows them to effectively determine the selectivity between over-current protective devices of low-voltage switchgear and controlgear.
IEC TR 61912-2:2009