Description
The Functional Devices RIB2401SB-NC is a compact, enclosed pilot relay designed for dependable switching in commercial and residential HVAC control applications. With a 24VAC/DC coil and a normally closed (NC) SPST contact configuration rated at 120V and 20A, this relay is well-suited for fan control, damper control, lighting circuits, and other building automation switching tasks where a fail-safe, normally closed output is required.
Key Features
- Coil voltage: 24VAC/DC — compatible with standard HVAC control circuits
- Contact configuration: SPST-NC (Single Pole Single Throw, Normally Closed)
- Switching voltage: 120V
- Contact current rating: 20A
- Built-in manual override for convenient commissioning and troubleshooting
- Enclosed housing protects internal components from dust and debris
- Compact form factor for easy panel or DIN rail mounting
Normally Closed Operation
The SPST-NC contact design means the circuit is closed (ON) when the coil is de-energized and opens (OFF) when the coil is energized. This fail-safe behavior is ideal for applications requiring the load to remain active during a power or signal loss — such as ventilation fans, heating circuits, or safety interlock systems.
Manual Override
The integrated manual override allows technicians to manually actuate the relay contacts without applying coil voltage. This feature simplifies system startup, testing, and diagnostics without the need for additional wiring or tools.
Typical Applications
- HVAC fan and blower control circuits
- Damper and actuator switching
- Building automation and energy management systems
- Lighting and load control panels
- Safety interlock and fail-safe switching circuits
Specifications
- Brand: Functional Devices
- Model / SKU: RIB2401SB-NC
- Coil Voltage: 24VAC/DC
- Switching Voltage: 120V
- Contact Rating: 20A
- Contact Type: SPST-NC (Normally Closed)
- Override: Manual override included
- Enclosure: Enclosed housing
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