The Functional Devices RIBU1C-RD is a 10-amp SPDT pilot control relay in a NEMA 1 Red housing, designed for fire alarm, smoke control, and life-safety system applications. The red enclosure version carries UL864 and California State Fire Marshal (CSFM) listings required for fire alarm and smoke control applications. Where codes require visually identifiable life-safety components, the RIBU1C-RD satisfies that requirement. It accepts two independent coil voltage inputs — 10-30 VAC/DC on the white/blue leads and 120VAC on the white/black leads — covering virtually every HVAC control voltage without stocking multiple coil variants. Gold flash contacts ensure reliable signal-level switching, and the relay carries Functional Devices' 10-year warranty with a rated mechanical life of 10 million cycles minimum.
Best for: Fire alarm, smoke control, and life-safety system applications requiring a 10-amp SPDT pilot relay with dual coil voltage flexibility and NEMA 1 Red rated housing.
The RIBU1C-RD is backed by Functional Devices' industry-leading 10-year warranty — the longest standard warranty in the RIB product line. Functional Devices reports a field failure rate of approximately 1 in 16,000 units.
When to Specify the RIBU1C-RD vs. Standard RIBU1C
The RIBU1C-RD is electrically identical to the standard RIBU1C — same dual coil voltage input, same 10-amp SPDT contacts, same gold flash contacts, same dimensions. The difference is the red enclosure and additional UL864 / California State Fire Marshal listings. Many AHJs (Authorities Having Jurisdiction) and fire codes require that relays used in fire alarm and smoke control circuits be visually identifiable as life-safety components. The red housing satisfies this requirement. If your application involves smoke damper control, stairwell pressurization, fire pump interlock, or any relay in a UL864-listed fire alarm system, specify the RIBU1C-RD. For standard HVAC and BAS applications where UL864 is not required, the standard RIBU1C is appropriate.
RIBU1C
Standard grey NEMA 1 housing. UL Listed, UL916. Plenum accepted. The most widely specified version for commercial HVAC and BAS applications.
RIBU1C-RD
Red enclosure. UL864 and California State Fire Marshal listed. Required for fire alarm and smoke control circuit applications.
RIBU1C-N4
NEMA 4 enclosure for wet, outdoor, and wash-down locations. UL508 listed for industrial control equipment.
| Wire Color | Function | Notes |
|---|---|---|
| White / Black stripe | 120VAC Coil Input | Use for 120VAC control circuits. Cap white/blue leads when using this input. |
| White / Blue stripe | 10-30 VAC/DC Coil Input | Use for 24VAC BAS outputs or 10-30VDC signals. Cap white/black leads when using this input. |
| White / Yellow stripe | Common (Comm) | Common terminal for SPDT contact circuit |
| Blue | N/C — Normally Closed | Connected to Common when coil is de-energized |
| Yellow | C — Contact | Switching contact output |
| Orange | N/O — Normally Open | Connected to Common when coil is energized |
| Specification | Value |
|---|---|
| Part Number | RIBU1C-RD |
| Contact Configuration | SPDT (Single Pole Double Throw) — 1 Relay, Continuous Duty Coil |
| Coil Voltage Input | 10-30 VAC/DC and 120VAC (dual input, 50-60 Hz) |
| Pull In Voltage | 9 VAC / 10 VDC |
| Drop Out Voltage | 2.1 VAC / 2.8 VDC |
| Coil Current — 10 VAC | 33 mA |
| Coil Current — 24 VAC | 46 mA |
| Coil Current — 120 VAC | 28 mA |
| Contact Rating — Resistive | 10A @ 277VAC | 10A @ 28VDC |
| Contact Rating — Pilot Duty | 480 VA @ 240-277VAC | 480 VA Ballast @ 277VAC |
| Contact Rating — Tungsten | 600W @ 120VAC N/O | 240W @ 120VAC N/C |
| Contact Rating — Motor | 1/3 HP @ 120-240VAC N/O | 1/6 HP @ 120-240VAC N/C | 1/4 HP @ 277VAC N/O | 1/8 HP @ 277VAC N/C |
| Electronic Ballast | Not rated for electronic ballast |
| Operate Time | 20ms |
| Expected Relay Life | 10 million cycles minimum (mechanical) |
| Gold Flash Contacts | Yes |
| Status LED | Yes — On = Relay Activated |
| Override Switch | No |
| Housing Rating | NEMA 1, Accepted for Use in Plenum |
| Enclosure Color | Red |
| Conduit Hub | 0.50” NPT |
| Dimensions | 1.70”H x 2.80”W x 1.50”D |
| Lead Wires | 16”, 600V rated |
| Operating Temperature | -30 to 140°F |
| Humidity Range | 5 to 95% non-condensing |
| Approvals | UL Listed, UL916, UL864, California State Fire Marshal (CSFM), C-UL, CE, RoHS |
| Origin | Made of US and non-US parts |
| Warranty | 10 Years |
| Bulk Ordering | Add -10PACK, -25PACK, or -100PACK to part number |
Smoke Control Systems
UL864 listing satisfies code requirements for relays in smoke damper and smoke exhaust control circuits
Fire Alarm Panel Interfaces
Used to switch HVAC equipment from fire alarm control panel outputs where UL864 listed components are required
Stairwell Pressurization
Interfaces fire alarm system to stairwell pressurization fans and dampers in high-rise smoke control applications
Fire Pump Interlock
Pilot duty rating suitable for fire pump motor starter coil control from fire alarm panel outputs
California Projects
California State Fire Marshal listing required for fire alarm and smoke control relays on California projects
Visual Life-Safety Identification
Red housing provides immediate visual identification of life-safety relays in mixed-use panels
Important — Electronic Ballast Rating & Coil Input Selection
The RIBU1C-RD is not rated for electronic ballast loads. Use for standard magnetic ballast and pilot duty rated loads only. When wiring the coil, use only one coil input at a time — either the 10-30 VAC/DC leads (white/blue) or the 120VAC leads (white/black). Cap off the unused leads. Never energize both coil inputs simultaneously.
- Mounting:
- Red Housing
- Number of Relays:
- 1
- Relay Contact Type:
- SPDT
