Photography: ESL by Interlogix 521NCSXT Photoelectric Smoke & Heat Detector with CleanMe & Sounder, 2-Wire - UTC (Formerly GE Security/ESL)

Photography: GE Security 521NCRXT Photoelectric 2-Wire Smoke Detector w/CleanMe, Heat Sensor and Auxiliary Relay, 8.5 - 33 VDC. Smart Dual Fixed/Rate of Rise Heat - GE SECURITY

Photography: Electro Signal Lab / ESL - 521NCRXT - Electro Signal Lab / ESL

Photography: UTC FIRE & SECURITY 521NCSXT Photoelectric 2-Wire Smoke Detector with - UTC (Formerly GE Security/ESL)

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E S L 521 SERIES - Home Controls, Inc.
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1. ESL 500N Series. ESL 500N Series. Smoke Detector. Installation Instructions. WARNING. This document is intended for licensed electricians/ alarm installers.

GE- 521B- 2-Wire Smoke Detector With Clean-Me | DPC Dist
The ESL 521 Series self-diagnostic, two-wire smoke detectors are the industry's first conventional direct-wire smoke detectors with analog features such as ...