Cranford Controls R24/R12 Auxiliary Relay Unit
£12.20
Summary
The R24 auxiliary relay unit is designed to switch additional field devices via two relay outputs, making it an essential component for fire and security system installations. Each unit features an LED indicator that remains visible during relay operation, providing clear status monitoring for system operators.
The relay allows the supply voltage to be continued through the device via additional terminals, ensuring seamless integration with existing systems. Every R24 unit incorporates reverse polarity protection, safeguarding against incorrect wiring and potential damage during installation or maintenance.
Typical applications include automatic door retainers, smoke vents, and fan shutdown systems, all of which are intended to be operated by automatic fire detection and alarm systems. The versatile design makes it suitable for a wide range of fire safety and building management applications where reliable relay switching is essential.
Features
- Two relay outputs for switching additional field devices
- LED indicator remains visible during relay operation
- Supply voltage continuation through device via additional terminals
- Reverse polarity protection on each device
- Self-contained version available in metal enclosure
- Single gang plate version with ‘Auxiliary Relay Operated’ text
- PCB version for mounting inside PSUs and panels
- Custom legend available on request
- 24Vdc operation with 18-40Vdc voltage range
- 230Vac 5A relay contact rating
- IP43 protection rating on surface mount and metal enclosure versions
- Low current consumption at 22mA nominal
- Suitable for automatic door retainers, smoke vents and fan shutdown
- Designed for operation by automatic fire systems
FAQ
What voltage does the R24 relay operate on?
The R24 operates on 24Vdc nominal voltage with an operating range of 18-40Vdc, making it compatible with standard fire alarm system power supplies.
How many devices can the R24 relay switch?
The R24 features two relay outputs, allowing you to switch two separate field devices. Each relay contact is rated at 230Vac 5A, suitable for most fire safety equipment including door retainers, smoke vents, and fan controls.
Which mounting option should I choose?
Choose the PCB version (503-002) for installation inside control panels or PSUs, the surface mount version (503-001) for visible wall mounting with the ‘Auxiliary Relay Operated’ legend, or the metal enclosure version (503-003) for standalone installations requiring additional protection.
Is the R24 suitable for outdoor use?
The surface mount and metal enclosure versions have IP43 protection rating, providing protection against dust and water spraying. However, they are designed primarily for indoor applications or protected outdoor locations.
Can I customise the labelling on the relay?
Yes, custom legends are available on request for the surface mount version, allowing you to specify text that suits your particular application or installation requirements.
How do I know when the relay is operating?
Each R24 unit features an LED indicator that is clearly visible during relay operation, providing immediate visual confirmation of the relay’s status.
Specifications
- Operating Voltage Range : 18-40 Vdc
- Nominal Current Consumption : 22 mA
- Relay Contact Rating : 230Vac 5A
- Coil Impedance : 1100 Ω
- Protection Rating : IP43 (surface mount and metal enclosure versions)
- Number Of Relay Outputs : 2
- Contact Configuration : SPDT (Single Pole Double Throw)
- Mounting Options : PCB, surface mount, metal enclosure
- Weight Pcb Version : 0.06 kg
- Weight Surface Mount : 0.02 kg
- Weight Metal Enclosure : 0.61 kg
- Colours Available : White (ABS fire retardant plastic), Grey
- Reverse Polarity Protection : Yes
- Led Indicator : Yes
- Custom Legend : Available on request
Downloads
- Datasheet (Adobe PDF)
Additional information
| Weight | 2.1 kg |
|---|---|
| Voltage | 24V DC, 12V DC |