ČSN EN IEC 60947-2 ed. 5 (354101)

Anotace obsahu normy

This document applies to circuit-breakers, intended to be installed and operated by instructed or skilled persons, the main contacts of which are intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V AC or 1 500 V DC; it also contains additional requirements for integrally fused circuit-breakers.
This document also applies to circuit-breakers with ratings at or below 1 000 V AC, additionally having one or more ratings above 1 000 V AC but not exceeding 1 500 V AC.
It applies whatever the rated currents, the method of construction or the proposed applications of the circuit-breakers may be.
Circuit-breakers per this document are suitable for isolation.
The requirements for circuit-breakers which are also intended to provide residual current protection are contained in Annex B. Additional requirements for circuit-breakers intended for connection of aluminium conductors are contained in Annex D. The additional requirements for circuit-breakers with electronic overcurrent protection are contained in Annex F. The additional requirements for circuit-breakers for IT systems are contained in Annex H. The requirements and test methods for electromagnetic compatibility of circuit-breakers are contained in Annex J. The requirements for circuit-breakers not fulfilling the requirements for overcurrent protection are contained in Annex L. The requirements for modular residual current devices (without integral current breaking device) are contained in Annex M. The requirements and test methods for electromagnetic compatibility of circuit-breaker auxiliaries are contained in Annex N. The requirements for instantaneous trip circuit-breakers are contained in Annex O. The requirements and test methods for DC circuit-breakers for use in photovoltaic (PV) applications are contained in Annex P. The requirements and test methods for circuit-breakers incorporating residual current protection with automatic reclosing functions are contained in Annex R.
Supplementary requirements for circuit-breakers used as direct-on-line starters are given in IEC 60947-4-1, applicable to low-voltage contactors and starters. The requirements for circuit-breakers for overcurrent protection for household and similar installations, and designed for use by uninstructed persons, are contained in IEC 60898 series. The requirements for circuit-breakers for equipment (for example electrical appliances) are contained in IEC 60934. For certain specific applications (for example traction, rolling mills, marine service, downstream of variable frequency drives, use in explosive atmospheres), particular or additional requirements can be applicable.