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Form C trouble relay
The EVS-50W has its own power supply with battery backup and four speaker circuits which can be expanded to eight speaker circuits with the optional EVS-CE4
Its gold-plated contacts prevent corrosion and it is available with a weather-proof backbox for outdoor use
for AA1 Size Enclosure
Silent Knight SK-PHOTO-R-W Intelligent Photoelectric Smoke Detector With Remote Test Capability In Duct DNR/DNRW
Notifier ABF-1DB Semi-Flush-Mount Backbox SK-MONITOR Form C trouble relayNotifier ABF 1DB Semi Flush Mount Backbox for ACS Series Annunciators Box only: 252mm high x 117mm wide x 63mm deep. Door: 279mm high x 152mm wide x 19 mm deep.