BS:142 sec.1.2- 1982; Electrical protection relays; pt.1: Information and requirements for all protection relays sec. 1.21 specification for contact performance
BS:142 sec.1.2- 1982; Electrical protection relays; pt.1: Information and requirements for all protection relays sec. 1.21 specification for contact performance
- London BSI 1982
- 4p.
- 0