System Sensor 4WITAR-B 4-Wire Smoke Detector and Heat Sensor w/ Relay and Sounder

The System Sensor 4WITAR-B is an i3 Series conventional 4-wire photoelectric smoke detector with an isolated 135°F fixed heat sensor, built-in 85 dB sounder, and Form C relay for local signaling and control. It uses a plug-in, base-included design with Stop-Drop ’N Lock attachment plus drift compensation and smoothing algorithms to help reduce nuisance alarms and simplify inspection. Key Specifications: Type: Conventional 4-wire photoelectric smoke detector with isolated heat, sounder, and relay Core Function(s): Photoelectric smoke detection with local 85 dB temporal tone; isolated 135°F fixed-heat input and onboard Form C relay output Loop/Protocol: Conventional 4-wire Power: 10 to 35 V (4-wire), non-polarized; 50 µA max average standby; 50 mA max alarm current Indicators/UI: Dual-color LEDs for power-up, standby, out-of-sensitivity, freeze trouble, and alarm status Compatible Accessories: RRS-MOD – Reversing relay and synchronization module (for i3 sounder coordination) SENS-RDR – Sensitivity reader (percent-per-foot obscuration display) A77-AB2 – Retrofit adapter bracket System Compatibility: Works with conventional fire alarm control panels that support 4-wire smoke detectors and listed initiating circuits.