2-Wire Smoke and Heat Detector

Esl 521bxt 2 wire smoke and heat detector

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The ESL 521BXT provides smoke and heat detection. It is a 2-wire dual-purpose smoke and heat sensor that is great for residential application. The device uses photoelectric technology to detect smoke, it uses rate-of-rise and fixed temperature for heat. Buy the ESL 521BXT from Alarm Grid.

This product has been discontinued and is no longer in stock.


The ESL 521BXT is a 2-wire smoke and heat detector that works with the NetworX Alarm Control Panels. The 521BXT has a photoelectric smoke detector and a fixed temperature and rate-of-rise heat detector. It is a great hardwired life-safety and fire-protection sensor for residential use.

The photoelectric smoke detector uses an internal light to determine whether or not smoke is in the area. Smoke will cause the light to refract, and the sensor will respond to this change. The rate-of-rise sensor responds to temperature increases of 15 degrees Fahrenheit or higher in a single minute. The fixed temperature sensor actives at 135 degrees Fahrenheit or higher. The sensor measures 5 inches in diameter and has a thickness of 2 inches.

Brand: ESL

* Based on a 10% APR with 12 months financing. APR's will vary between 10% - 30% based on credit score and various factors.