System Sensor 4WTAR-B

The System Sensor 4WTAR-B is a 4-wire photoelectric i3 smoke detector with integrated thermal sensor and built-in audible sounder, designed for addressable fire alarm systems. Operating at 12–24 VDC, the detector combines smoke sensing with thermal protection and features an 85 dB temporal alarm tone with Form C relay output for reliable alerting and control integration.

Key Features

• Photoelectric smoke detection with 2.5% per foot nominal sensitivity per UL 268
• Integrated thermal sensor activating at 135°F (57°C)
• Built-in 85 dB temporal sounder for audible notification
• Form C relay with 0.5 A @ 30V AC/DC alarm contact rating
• i3 Series intelligent features: drift compensation and RF interference filtering
• Installer-friendly base with Stop-Drop N Lock detector mounting
• Maximum alarm current: 50 mA at 24 VDC

Technical Specifications

• Operating Voltage: 12–24 VDC
• Smoke Sensitivity: 2.5% per foot nominal (UL 268 standard)
• Thermal Activation: 135°F (57°C)
• Alarm Current: Maximum 50 mA
• Sounder Output: 85 dBA temporal pattern
• Relay Contacts: Form C, 0.5 A @ 30V AC/DC
• Operating Temperature: 32°F–100°F (0°C–37.8°C)
• Operating Humidity: 0–95% RH non-condensing
• Wiring: 4-wire configuration for power and signaling

Certifications

• UL Listed photoelectric smoke detector (UL 268)
• Compatible with addressable fire alarm systems
• i3 Series intelligence certified