Silent Knight SK-4 Four Zone Conventional Fire Alarm Control Panel

The Silent Knight SK‑4 is a four‑zone conventional fire alarm control panel engineered to deliver reliable protection for small to medium sized commercial, industrial or institutional buildings. It incorporates modern microprocessor based circuitry to monitor and manage four Class B initiating device circuits (IDCs) and two Class B notification appliance circuits (NACs) under 120 VAC supply. The SK‑4 supports conventional input devices such as two‑ and four‑wire smoke detectors, pull‑stations, water‑flow and tamper switches, enabling flexible field wiring. It features selectable silent or audible walk‑test modes, individual zone disable switches, Form C alarm/trouble/supervisory relays, and synchronization support for leading brands of notification appliances offering enhanced adaptability during installation and service. The modular design accepts optional modules including Class A converter, LED interface, zone relay and transmitter modules, allowing system expansion and customization. It is housed in a compact red metal cabinet sized at approximately 14.5″ W × 15″ H × 3″ D and weighs around 15 lbs ready‑to‑install. The SK‑4 charges sealed lead acid batteries up to 7 Ah internally or up to 18 Ah with an external battery box, and complies with standard fire alarm signalling codes.