System Sensor (4WTR-B) 4-wire, smoke/thermal detector with Form C relay

System Sensor 4WTR-B 4-Wire Conventional Combination Smoke and Thermal Detector

The System Sensor 4WTR-B is a dual-technology fire detector that combines photoelectric smoke detection with thermal heat sensing in a single device. This combination approach reduces nuisance alarms while ensuring reliable detection across a broader range of fire types, from fast-flaming fires to slow-smoldering combustion.

The 4WTR-B operates on a 4-wire circuit, providing separate power and signal connections that give system designers greater flexibility in circuit layout and supervision. Its compatibility with standard conventional fire alarm panels makes the System Sensor 4WTR-B a strong choice for applications where the additional protection of dual-technology detection is required without migrating to an addressable system.

Common applications for the 4WTR-B include kitchens, mechanical rooms, storage areas, and other environments where either smoke or heat alone might trigger nuisance alarms. The detector mounts on the System Sensor B501-WH base for a consistent installation profile. Contact Life Safety Consultants for availability and technical support when specifying the 4WTR-B for your project.

• Combination photoelectric smoke and thermal heat detection
• 4-wire power and signal circuit
• Reduces nuisance alarms with dual-technology sensing
• Compatible with conventional fire alarm control panels
• Mounts on System Sensor B501-WH base

For more information, contact the Life Safety Consultants team at (888) 557-0558, or email us at: sales@lifesafetycom.com