Cranford Controls

Mains Voltage Safety Isolator

Product Overview

The Cranford Controls’ range of main voltage safety isolator switches provide a safe and secure method of isolating the voltage supply to fire alarm system products using mains voltage. Protected by a 4 Amp fast blow fuse, which is disconnected from the mains supply when isolated. The unit is supplied complete with an isolation key and a standard single gang back box which can be mounted on a standard 20mm conduit box.


  • Safe reliable isolation of Fire Panels and Power Supply Units
  • Compliant with the installation requirements of BS5839 Part 1
  • Robust modular design
  • Red or White version available
  • Surface and flush mounted
  • Power Indication LED


Maximum Voltage 250V -AC50Hz
Switch Contact Rating 250VAC 4amp, double pole
Fuse Rating 4A Fast
Weight (kg) 0.175
Switch Surge Rating 80 Amp
Dimensions (w x h x d, mm) 57 x 87 x 87
Environmental Protection Internal use only, not for outside applications

Part Numbers

513-007 Mains Isolator Switch with Keyswitch and Green LED Indicator – Red Body
513-008 Mains Isolator Switch with Keyswitch and Green LED Indicator – White Body