Functional Devices RIB2401SB-NC 20 Amp SPST-NC Power Relay with Override

The Functional Devices RIB2401SB-NC is a heavy-duty power relay designed for HVAC and industrial control applications requiring reliable switching of electrical loads. This relay features a 20 amp Single Pole Single Throw Normally Closed (SPST-NC) contact configuration with a manual override function for testing and emergency operation.

Key Features:

• 20 amp resistive load rating at 277 VAC
• SPST-NC (Single Pole Single Throw Normally Closed) contact configuration
• Dual voltage coil operates on 24 Vac/dc or 120 Vac
• Manual override switch for testing and emergency operation
• NEMA 1 rated enclosure for general indoor applications
• Pilot light indicates when relay is energized
• Universal mounting options for DIN rail or surface installation
• UL and cUL listed for safety compliance

The RIB2401SB-NC is ideal for switching motors, lighting loads, heating elements, and other electrical equipment in commercial HVAC systems, building automation, and industrial control panels. The normally closed contact design ensures the load remains connected when the coil is de-energized, making it suitable for fail-safe applications. The compact NEMA 1 housing protects internal components from dust and incidental contact, while the clear cover allows visual inspection of wiring and status indicators.