UTC Interlogix (Formerly GE Security/ESL) 521NCSXT 2-Wire Photoelectric Smoke Detector, CleanMe, Sounder

The UTC 521NCSXT self-diagnostic, 2-wire smoke detector is a conventional, direct-wire smoke detector with analog features such as remote maintenance/trouble reporting (CleanMe), drift compensation, and multi-criteria detection.

The 521NCSXT continually monitors its own sensitivity and operational status, and provides a visual and remote trouble condition if the unit drifts out of the sensitivity range or fail internal diagnostics.

The 521 NCSXT is equipped with both a rate-of-rise and fixed temperature sensor, a temporal 3 sounder and operates on 8.5 - 33 VDC.


Also known as: ES-521NCSXT, GES-521NCSXT

Technical Specifications: Listings: 511 UL 268 Reset time: 1 second minimum Mounting dimensions: 4.75 in. (12.1cm) diameter; 0.3 in. (0.8cm) height Detector head dimensions: 5 in. (12.7cm) diameter; 2 in. (5cm) height Drift compensation adjustment: 1.0%/ft. max UL 2-wire compatibility identifier: DIP switch 1 ON S09A, DIP switch 1 OFF S10A, S11A (RX models) Heat detector specifications rate of rise: - 15 F/min and >105 F (8.3 C/min and >40.6 C) Detector packaging: 10 detectors per carton Field wiring size: 12-24 AWG Color: White head and base RFI immunity: 20V/m minimum; 0-1000MHz Operating humidity range: 0 to 95% non-condensing Photoelectic sensitivity: 3.1% + 0.5 - 1.0% Alarm current: 10 mA min. - 60 mA max Alarm contacts: 500mA @ 36VDC (resistive) Aux. relay contacts: 2A @ 30VDC Typical alarm current (12/24V): up to 60mA max. if not limited by control panel Typical average standby current: 70 uA (12/24V) Maximum ripple: (pk to pk) 10% (V p-p) Voltage: DIP switch 1 ON for standard 24V operation (8.5-33 VDC), polarity sensitive Operating termperature: 32° to 100°F (0° to 37°C)

For more information about the UTC (Formerly GE Security/ESL) 521NCSXT, please contact us.