Cranford Controls

R24 Auxillary Relay Units 24Vdc

Product Overview

The R24 relay is intended to switch addtional field devices via the two relay outputs supplied. An LED is mounted so
that it remains visible during the relay operation.

The supply voltage to the relay coil may be continued through the device via the additional terminals supplied. Each device is reverse polarity protected.

Typical usage examples are; automatic door retainers, smoke vents and fan shutdown, which are intended to be operated by an automatic fire system.


  • PCB version for mounting inside PSU’s, panels, etc.
  • Self contained version in a metal enclosure
  • Single gang plate version has ‘Auxiliary Relay Operated’ text


Type PCB Surface mount Metal enclosure
Voltage range (Vdc) 18 – 40
Nom. current consumption (mA) 22
Relay contact rating 230Vac 5A
Coil impedance (?) 1100
Protection rating  n/a IP43  IP43
Boxed weight (kg) 0.051 0.15 0.612
Colours available  n/a white grey

Part Numbers

“Auxiliary Relay Operated” text, single gang,surface 503-001
PCB only, supplied with 4 adhesive feet 503-002
PCB mounted in metal enclosure with lid 503-003