Functional Devices RIB023P-NC : Enclosed Power Relay, 20 Amp Contact Rating, Relay Contact Type: 3PST-N/C, 208-277 Vac Coil Voltage, NEMA 1 Housing

• Relays & Contact Type: One (1) 3PST Continuous Duty Coil – Normally Closed
• Expected Relay Life: 10 million cycles minimum mechanical
• Operating Temperature: -30 to 140° F
• Humidity Range: 5 to 95% (noncondensing)
• Operate Time: 20ms
• Relay Status: LED On = Activated
• Dimensions: 4.00" x 4.00" x 1.80" with 0.50" NPT Nipple
• Wires: 16", 600V Rated
• Approvals: UL Listed, UL916, UL864, C-UL, California State Fire Marshal, CE, RoHS
• Housing Rating: Accepted for Use in Plenum, NEMA 1
• Gold Flash: No
• Override Switch: No

• 20 Amp Resistive @ 300 Vac, 28 Vdc
• 20 Amp Ballast @ 277–480 Vac (Not rated for Electronic Ballast)
• 15 Amp Resistive @ 600 Vac
• 770 VA Pilot Duty @ 120 Vac, 1 Phase
• 1,158 VA @ 240 Vac, 1 Phase
• 1,110 VA @ 277 Vac, 1 Phase
• 1,640 VA @ 480 Vac, 1 Phase
• 1,466 VA @ 240 Vac, 3 Phase
• 2,112 VA @ 480 Vac, 3 Phase
• Heavy Pilot Duty @ 600 Vac
• 7.5 HP @ 480 Vac, 3 Phase
• 5 HP @ 240 Vac, 3 Phase
• 3 HP @ 480–600 Vac, 1 Phase
• 2 HP @ 240–277 Vac, 1 Phase
• 1 HP @ 120 Vac, 1 Phase

Coil Current: 187 mA @ 208–277 Vac

Coil Voltage Input: 208–277 Vac; 50–60 Hz (Drop Out = 60 Vac, Pull In = 160 Vac)

• What does the “-NC” mean in RIB023P-NC?
  “NC” indicates normally closed contacts, which means the circuit is closed when the relay coil is not energized. This configuration is useful in applications requiring a fail-safe or default-closed state.
• How is this different from the standard RIB023P?
  The RIB023P-NC is functionally the same in coil and contact ratings, but it uses a normally closed contact configuration instead of normally open.
• Can it be used with high-voltage control panels?
  Yes. With a 208–277 VAC coil and NEMA 1 housing, it’s designed for commercial panels and control systems using higher voltage inputs.

• Tip: Select the RIB023P-NC if your application requires relay contacts to remain closed during a power loss.
• Tip: Clearly label N/C wiring in the panel for future servicing and inspections.
• Mistake to Avoid: Do not substitute this in place of a standard N/O relay unless your control logic is designed for normally closed operation.
• Mistake to Avoid: This relay is not compatible with LED drivers or electronic ballast loads.

"The RIB023P-NC is our go-to for high-voltage fail-safe circuits. Works well in exhaust fan shutdown and override scenarios."
- Blake H., Automation Contractor, Denver, CO