BEAMA Guide - Low Voltage Switch and Fusegear Devices

11 January 2022

This Guide provides specifiers, installers and end users, guidance on the low-voltage switch and fusegear devices. This Guide considers switching devices conforming to to BS EN 60947-3 and fuses conforming to the BS EN 60269 series. Edition 4 of IEC 60947-3 includes new content reflecting the changing application for low-voltage switchgear and fusegear devices. The new content includes:

a) Critical load current tests for DC switches.

b) Requirements for a conditional short-circuit rating for disconnectors, switches, and switch-disconnectors protected by circuit-breakers.

c) Requirements for connection to aluminium conductors.

d) Device power losses measurement.

This Guide covers definitions and application of switching devices and fuses.