OP921 - Optical Smoke Detector. Model OP921 is an optical (smoke) addressable smoke detector used on Cerberus PRO systems. Model OP921 detects the presence of a system event/condition by measuring smoke obscuration in the sensing chamber at the point from where it is installed, sending an alarm signal to a Siemens-compatible FACP
Circuit breaker size S00 for motor protection, CLASS 10 A-release 0.18...0.25 A N-release 3.3 A Screw terminal Standard switching capacity with transverse auxiliary switch 1 NO+1 NC