SIRIUS safety relay safety-related speed monitoring DC 24 V, 45 mm spring-loaded terminal FK undelayed: 2 S FK delayed: 0 MK: 2 electrical auto-start/manual start basic unit maximum achievable PL according to EN 13849-1: e maximum achievable SIL according to IEC 61508: 3 SIRIUS 3TK28 speed monitor for safe standstill and speed monitoring in machines and systems, e.g. motors.The device is suitable for all common sensors and has an adjustable release delay. With the help of simple parameterization and constant diagnostics via the display, errors can be quickly rectified at any time. Thanks to the integrated protective door monitoring, the device ensures greater safety by only releasing the system in a safe state.The devices are available with different voltages and with screw or spring-loaded connections.Accessories such as connecting cables, adapters and nameplates make handling easier.Safety is a SIRIUS business.