System Sensor 4WTA-B Smoke Detector

The System Sensor 4WTA-B is a commercial 4-wire smoke detector designed for conventional fire alarm systems. It combines a smoke sensing chamber, a 135°F (57.2°C) fixed-temperature thermal sensor, and an integrated 85 dBA sounder in a single low-profile detector, providing dependable smoke and heat detection with local audible notification.

As part of the System Sensor i3™ Series, the detector features drift compensation, maintenance signaling, dual-color LED status indication, and plug-in installation for simplified servicing. This product is intended exclusively for commercial fire alarm installations.

Product Functions

• Detects airborne smoke
• Provides 135°F (57.2°C) fixed-temperature heat detection
• Integrated 85 dBA sounder
• Reports alarm conditions to the fire alarm control panel
• Automatic drift compensation
• Maintenance notification
• Freeze trouble indication
• Dual-color LED status indication
• Supports synchronized sounder operation with compatible modules

Electrical & System Information

The 4WTA-B operates from a 12/24 VDC non-polarized power source and is intended for conventional 4-wire fire alarm systems. It utilizes automatic drift compensation and smoothing algorithms to maintain reliable smoke detection while reducing nuisance alarms caused by dust accumulation.

When used with the optional RRS-MOD Reversing Relay/Synchronization Module, multiple i3 Series sounder detectors can activate simultaneously and may be synchronized and silenced from the fire alarm control panel.

Features

• Commercial 4-wire smoke detector
• Smoke sensing chamber
• 135°F (57.2°C) fixed-temperature thermal sensor
• Built-in 85 dBA sounder
• Automatic drift compensation
• Freeze trouble notification
• Dual-color LED indicators
• Plug-in detector head
• Removable smoke chamber
• Low standby current
• SEMS screw terminals
• i3™ Series design

Mounting & Design

The 4WTA-B includes a mounting base and installs on 3½-inch octagonal, 4-inch octagonal, single-gang, or 4-inch square electrical boxes with plaster rings, and may also be mounted directly to drywall using anchors where permitted.

Its plug-in detector head allows the base to be pre-wired, simplifying installation, inspection, cleaning, testing, and replacement without disturbing field wiring.

Protection & Applications

Suitable for:

• Office Buildings
• Schools
• Healthcare Facilities
• Hotels
• Apartment Buildings
• Retail Facilities
• Warehouses
• Light Industrial Facilities
• Commercial Properties

Compatibility

Compatible with:

• Conventional 4-Wire Fire Alarm Control Panels
• System Sensor i3™ Series Accessories
• RRS-MOD Reversing Relay/Synchronization Module
• 2W-MOD2 Maintenance/Test Module
• SENS-RDR Sensitivity Reader
• RT Removal Tool

Always verify compatibility with the installed fire alarm control panel, notification circuit, power supply, end-of-line supervision, and project requirements before installation.

Technical Specifications

Manufacturer: System Sensor

Parent Company: Honeywell

Model: 4WTA-B

Series: i3™

Product Type: 4-Wire Smoke Detector with Built-In Sounder

Detection Method: Smoke Sensing Chamber with Fixed-Temperature Thermal Sensor

Thermal Rating: 135°F (57.2°C) Fixed Temperature

Sounder Output: 85 dBA

Operating Voltage: 12/24 VDC Nominal (8.5–35 VDC)

Maximum Ripple Voltage: 30% Peak-to-Peak

Standby Current: 50 µA Maximum

Maximum Alarm Current: 35 mA

Alarm Contact Rating: 0.5 A @ 30 VAC/DC

Smoke Sensitivity: 2.5%/ft Nominal

Freeze Trouble Threshold: 41°F (5°C)

Operating Temperature: 32°F to 100°F (0°C to 37.8°C)

Operating Humidity: 0%–95% RH Non-Condensing

Wiring: 4-Wire Conventional

Terminal Size: 14–22 AWG

Dimensions: 5.3 in. Diameter × 2.0 in. Height (134 × 51 mm)

Weight: 7.1 oz. (200 g)

Mounting: Included Plug-In Base

Application: Indoor Commercial Fire Alarm Systems

Listings: UL 268 Listed for Fire Protection Signaling Systems. Verify product labeling and project requirements before installation.

Applications

The System Sensor 4WTA-B is designed for commercial conventional fire alarm systems requiring combined smoke detection, fixed-temperature heat detection, and local audible notification. Typical applications include office buildings, schools, hotels, healthcare facilities, apartment buildings, warehouses, retail spaces, and other commercial occupancies where a 4-wire smoke detector with an integrated sounder is required.

4WTA-B Datasheet