The KC2-OS is Kidde's conventional two-wire photoelectric smoke detector head, built for panels that need a proven, low-maintenance detector rather than an addressable loop device. It drops onto a KC2 series base and reports back through the same two-wire circuit used by the rest of a conventional zone, so replacing an aging detector or adding one to an existing loop doesn't mean rethinking the panel wiring.
Why installers reach for it
- Optica sensing technology: multi-criteria photoelectric detection discriminates real smoke from nuisance sources like cooking vapor, cutting down on false-alarm callbacks.
- Self-diagnostic: the detector continuously monitors its own sensitivity and operational status and reports drift automatically.
- Tri-color status LED: solid red for alarm, flashing yellow for trouble, flashing green for standby - readable at a glance during service calls.
- Head-and-base design: the detector head is field-replaceable without disturbing the base wiring.
Panel compatibility
The KC2-OS is compatible with Kidde FX5 and FX10 conventional panels, GSA-UM/MAB signature modules, and RZI16-2/RZI16-2RS zone interfaces. It carries the S10A two-wire compatibility identifier that panels use to confirm proper supervision.
Brand:
Kidde Commercial
Form factor:
Conventional two-wire photoelectric smoke detector head (base sold separately)
Power input:
6.5 to 33V DC
Standby current:
88 uA typical @ 24V DC
Sensitivity:
0.5% to 4.36%/ft photoelectric
Operating temp:
32 to 120 F (0 to 49 C)
UL two-wire compatibility ID:
S10A
Compatible bases:
KC2-SB, KC2-SB4, KC2-RB, KC2-RB4
Compatibility:
FX5, FX10, GSA-UM/MAB, RZI16-2, RZI16-2RS, FX-2WIRE
Compliance:
UL 268 7th Ed, ULC, FM, CSFM
Does the KC2-OS come with a base?
No. The KC2-OS is a head-only detector. Pair it with a KC2-SB standard base or a KC2-RB relay base, both sold separately.
What does the S10A compatibility ID mean?
S10A is the UL two-wire compatibility identifier Kidde conventional panels use to confirm the detector is properly supervised on a two-wire initiating circuit.
What's the difference between the KC2-OS and KC2-OSH?
The KC2-OS is smoke-only. The KC2-OSH adds an integral 135F fixed-temperature heat sensor alongside the same photoelectric chamber.
What panels can I use this detector on?
FX5 and FX10 conventional fire alarm control panels, GSA-UM/GSA-MAB signature class A-B modules, and RZI16-2/RZI16-2RS zone interfaces.
Spec Sheet
