S4 Self Test Detectors
Gent S4T-780-S Self-Test Heat Sensor + Sounder

- Operating voltage
- 35V - 48V
- IP rating
- IP21C
- Enclosure
- Terluran GP-35 (ABS) for outer housing
- Ambient operating temperature
- -10 °C to +50 °C
- Sounder current
- 2 mA average and 4.5 mA maximum in Turbo mode mA
- Sounder approval (EN54)
- EN54-3: 2001 + A1: 2002 + A2: 2006 / EN54-3: 2014 + A1: 2019
- Heat approval (EN54)
- EN54-5: 2017 + A1: 2018
Required to operate
Needed to install, power or certify this product.

Base - Common for all S-Quad Sensors
Mounting base common to all S-Quad Self-Test sensors
Overview
What it is and how it fits the system.
The Gent S4T-780-S is an S4 SELF-TEST Heat Sensor Sounder, a loop-powered device in the S-Quad Self-Test (S4T) series combining a heat sensor with an integrated sounder. It delivers heat detection and audible alarm output from a single self-test-capable loop device.
Technical overview
The S4T-780-S is a Gent by Honeywell S4 SELF-TEST Heat Sensor Sounder, a loop-powered S-Quad Self-Test series device combining a heat sensor with an integrated sounder. It delivers heat detection and audible alarm output from a single self-test-capable loop device, operating on 35V–48V with IP21C enclosure protection. The device features Terluran GP-35 (ABS) outer housing in white (RAL 9010) or black (RAL 9005) finishes.
It operates in ambient temperatures from -10°C to +50°C and stores between -20°C and +65°C, with 95% non-condensing relative humidity between +5°C and +45°C. The sounder draws 2 mA average and up to 4.5 mA maximum in Turbo mode, with Bluetooth range of 10m. Approvals include EN54-3: 2001 + A1: 2002 + A2: 2006 / EN54-3: 2014 + A1: 2019 for sounder, EN54-5: 2017 + A1: 2018 for heat detection, and LPCB, CE & UKCA certification. Compatible with S4-700 base, and supports optional S4-705 covers, S4-FLUSH kit, and 13449-01 remote LED.
Specifications
Full technical data for this part.
| Description | S4 SELF-TEST Heat Sensor Sounder |
|---|---|
| Operating voltage | 35V - 48V |
| IP rating | IP21C |
| Enclosure | Terluran GP-35 (ABS) for outer housing |
| Colour | White : RAL 9010 Black : RAL 9005 |
| Storage Temperature | -20 °C to +65 °C |
| Ambient operating temperature | -10 °C to +50 °C |
| Relative Humidity | 95 % non-condensing (+5 °C to +45 °C) % |
| Bluetooth range | 10m |
| Sounder current | 2 mA average and 4.5 mA maximum in Turbo mode mA |
| Sounder approval (EN54) | EN54-3: 2001 + A1: 2002 + A2: 2006 / EN54-3: 2014 + A1: 2019 |
| Heat approval (EN54) | EN54-5: 2017 + A1: 2018 |
| Approvals | LPCB approval, CE & UKCA |
Specifications sourced from manufacturer documentation.
Specifications per manufacturer documentation, subject to change — E&OE. Spotted an inaccuracy? Let us know
Enhancements (optional)
Optional additions — this product works without them.

S-Quad Semi-Flush Mounting Kit
Semi-flush mounting kit for S-Quad Self-Test device

Remote LED (for use with common base S4-700)
External repeat LED driven by device I/O
Compare variants
Alternatives in the same range — pick the variant that fits your install.

