1. Specification for control switches (switching devices, including contactor relays, for control and auxiliary circuits, for voltages up to and including 1000 V a.c. and 1200 V d.c.). Contactor relays. Pilot switches Part 2 Sections 2.3 and 2.4, (31st October 1977) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (8 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
2. Specification for low voltage switchgear and controlgear for industrial use. Terminal marking, distinctive number and distinctive letter for particular contactor relays. (31st May 1978) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (12 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
3. Harmonized system of quality assessment for electronic components. Generic specification: mercury wetted change-over contact units, mechanically biased. (30th November 1987) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (38 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗