12V/4-wire Operation With Alarm Relay: 4W Conventional Fire 10V-30V Operation Suitable for fast fire detection where normal temperatures do not exceed 38°C Unsuitable for environments where the temperature may change rapidly Microprocessor Technology Digital Technology Detection Algorithms Latch Input Enables Auto Reset: 4W Alarm Situation Test Button EN54-5 Compliant Exodus rate of rise heat detector detects r apid temperature increases or temperatures above 58°C.