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ESL brand 500 Series conventional photoelectric smoke detectors come in a variety of models from the simplest to the most complex smoke and fire alarm applications. The 500 Series offers sounders in two- and four-wire applications, specifically to meet residential code requirements. For example, the 500 Series offers choices for optional auxiliary relays and isolated heat sensors for commercial applications, such as elevator recall or hotel/dorm rooms.
Specifications
521NCRXT Specifications PDF
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