Functional Devices RIB2401SB-NC : Enclosed Power Relay, 20 Amp Contact Rating, Relay Contact Type: SPST-N/C + Override, 24 Vac/dc/120 Vac Coil Voltage, NEMA 1 Housing

The RIB2401SB-NC is commonly used in commercial and industrial settings where a normally closed relay with manual override is needed. It’s ideal for fan shutoff circuits, emergency stop control, or systems where power must be interrupted unless actively powered by control voltage. The integrated override switch provides quick serviceability, while its dual coil voltage input supports flexible system design.

• Relays & Contact Type: One (1) SPST Continuous Duty Coil
• Expected Relay Life: 10 million cycles minimum mechanical
• Operating Temperature: -30 to 140° F
• Humidity Range: 5 to 95% (noncondensing)
• Operate Time: 18ms
• Relay Status: LED On = Activated
• Dimensions: 2.390" x 3.310" x 1.810" with 0.50" NPT Nipple
• Wires: 16", 600V Rated
• Approvals: UL Listed, UL916, UL864, C-UL, California State Fire Marshal, CE, RoHS
• Housing Rating: UL Accepted for Use in Plenum, NEMA 1
• Gold Flash: No
• Override Switch: Yes

• 20 Amp Resistive @ 277 Vac
• 20 Amp Ballast @ 277 Vac (N/O)
• 10 Amp Ballast @ 277 Vac (N/C)
• Not rated for Electronic Ballast
• 10 Amp Tungsten @ 120 Vac (N/O)
• 770 VA Pilot Duty @ 120 Vac
• 1,110 VA Pilot Duty @ 277 Vac
• 2 HP @ 277 Vac
• 1 HP @ 120 Vac

Coil Voltage Input:
24 Vac/dc or 120 Vac ; 50–60 Hz
Drop Out = 2.1 Vac / 3.8 Vdc
Pull In = 18 Vac / 22 Vdc

Coil Current:
50 mA @ 18 Vac
83 mA @ 24 Vac
47 mA @ 120 Vac
33 mA @ 22 Vdc
35 mA @ 24 Vdc
47 mA @ 30 Vdc

Notes:

• Order Normally Closed by adding “-NC” to end of model number