The 700 series conventional detector line includes a range of temperature detectors: The DT713-5 is a class A2 temperature detector with a fixed temperature threshold of 57°C and built in rate-or-rise functionality. Automatic self diagnostics: Dynamic full detector and sensitivity test. High false alarm immunity. Built-in relay option. Separate fire and fault LED. 12 - 24 VDC operation. Polarity insensitive. Part of a full range: optical, heat and optical/heat multi criteria detectors. EN54 approved and CPR certified. The DT713-5R has the same specifications as the DT713-5, but in addition includes a built in potential free changeover relay.