The MR104C packs four independently switched SPDT relays into one dustproof metal enclosure, with a red LED per position so a tech can confirm which relay is energized without pulling a meter.
Built for the commercial fire installer
Each relay position accepts whichever control voltage the job calls for — 24 Vdc, 24 Vac, 115 Vac, or 230 Vac — by landing on the correct input terminals, so one enclosure covers mixed-voltage control jobs instead of stocking separate relays per voltage. Positions snap apart from the four-position master if a job only needs one or two relays, and track mounting hardware drops straight into standard equipment cabinets.
Key features
- Four SPDT relay positions, each independently powered from 24 Vdc, 24 Vac, 115 Vac, or 230 Vac
- Red LED per position confirms coil energization at a glance — no meter required
- Dustproof metal enclosure with LED viewing port
- Snap-apart design lets single, dual, or triple relay modules break off the 4-position master
- UL recognized at 10 million mechanical operations; UL listed as control unit accessory
- Track mounting hardware for standard equipment cabinets
Compatibility
General-purpose control and switching for fire alarm, HVAC, security, energy management, and lighting control systems.
Brand:
Kidde Commercial
Form factor:
4-position SPDT relay bank, metal enclosure
Contact rating:
10A
Input voltages:
24 Vdc, 24 Vac, 115 Vac, or 230 Vac (per position)
Indicators:
Red LED per relay position
Listings:
UL recognized (10M ops), UL listed control unit accessory
What voltages can energize each relay position?
Each of the four SPDT positions can be energized independently from 24 Vdc, 24 Vac, 115 Vac, or 230 Vac by wiring to the matching input terminals.
Can I use fewer than four relays from this unit?
Yes, single, dual, or triple relay modules snap apart from the standard four-position master.
How do I tell which relay is energized?
Each position has its own red LED, visible through the enclosure's viewing port, so no metering is required to check status.
What's the contact rating?
10 Amp SPDT contacts, UL recognized for 10 million mechanical operations.
Spec Sheet
