The KC2-RB4 is the 6-inch, trim-skirt version of Kidde's KC2 relay base, adding auxiliary relay functionality underneath any KC2 series detector head so a single conventional loop can also drive a fan shutdown, damper, or door closer directly off the detector's alarm state.
Why installers reach for it
- Built-in auxiliary relay: contacts change state automatically the moment the connected detector goes into alarm.
- Trim skirt included: the 6-inch diameter base ships with a trim skirt already in place, hiding mounting tabs without ordering a separate GSA-TS accessory.
- Shares detector diagnostics: works with any KC2-OS, KC2-OSH, or KC2-H head - no separate wiring scheme to remember per detector type.
Compatibility
Compatible with the full KC2 series head lineup (KC2-OS, KC2-OSH, KC2-H).
Brand:
Kidde Commercial
Form factor:
Relay base with integral trim skirt, 4 terminals, 6-inch diameter
Weight:
0.2 lb (0.09 kg)
Compatible detectors:
KC2-OS, KC2-OSH, KC2-H
Function:
Adds auxiliary relay output that follows the connected detector's alarm state
Mounting:
Standard North American electrical box; trim skirt included
Spec Sheet
