... Modes -- ROR, Fixed Temperature HEIMAN Fire Alarm Products4 Wire Conventional Heat Detector --- HM-203HC-4Power Supply Non-Polar Input Low Standby Current ... (relay N.O.); 5mA (relay N.C.)Alarm IndicationRed LEDEnvironment-10 °C ~ +50 °C , Humidity ≤ 95%RHTemp. Trip Point57°C (135 ... ) Direct control on material, testing, quality, leadtime etc. Fire Alarm Heat Detector (Rate-Of-Rise, Fixed Temperature)