311. BS EN IEC 61810-7-53. All-or-nothing electrical relays. Tests and Measurements. Part 7-53. Slow decrease and increase of supply voltage (8th October 2021) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (9 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
312. BS EN IEC 61810-7-54. All-or-nothing electrical relays. Tests and Measurements. Part 7-54. Critical DC load current test (8th October 2021) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (10 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
313. BS EN IEC 61810-7-8. All-or-nothing electrical relays. Tests and Measurements. Part 7-8. Timing (15th October 2021) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (15 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
314. BS EN IEC 61812-1. Time relays and coupling relays for industrial and residential use. Part 1. Requirements and tests (11th June 2021) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (63 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
315. BS EN IEC 61812-1. Time relays for industrial and residential use. Part 1. Requirements and tests (20th November 2020) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (63 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
316. BS EN IEC 61812-1. Time relays for industrial and residential use. Part 1. Requirements and tests (7th July 2020) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (63 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
317. BS EN IEC 61857-33. Electrical insulation systems. Procedures for thermal evaluation. Part 33. Multifactor evaluation with increased factors at elevated temperature (14th May 2021) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (27 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
318. BS EN IEC 61869-1. Instrument transformers. Part 1. General requirements (7th May 2021) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (143 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
319. BS EN IEC 61869-210. Instrument transformers. Part 210. Additional requirements for low power current transformers and current sensors for application within Low Voltage systems (6th November 2020) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (99 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
320. BS EN IEC 61869-9 AMD1. Instrument transformers. Part 9. Digital interface for instrument transformers (17th January 2023) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (15 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗