The ESL 541 Series self-diagnostic, four-wire smoke detectors are the industry's first conventional direct-wire four wire smoke detectors with analog features such as drift compensation and multi-criteria detection. Compatible with all 12-24 Volt DC Alarm Panels that provide Class A or Class B Initiation Circuits.
*Note four wire smoke detectors must have the DC Power Circuit Supervised using an end-of-line relay at the last detector in the circuit. End-of-Line Relay is not included.
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