SIRIUS safety relay safety-related standstill monitoring AC 400 V, 45 mm screw connection FK undelayed: 3 NO + 1 NC FK delayed: 0 MK: 3 Auto-start basic device max. error category EN 954-1: 4 maximum achievable PL according to EN 13849-1: e maximum achievable SIL according to IEC 61508: 3 SIRIUS 3TK28 standstill monitor for safe standstill monitoring of motors.The device can be used flexibly with various motors and frequency converters and has an adjustable standstill delay. It is cost-effective because no additional sensors are required. Higher system availability is achieved through rapid error diagnostics and display on error LEDs.The devices are available with different voltages and with screw or spring-loaded connections.Accessories such as nameplates make handling easier.Safety is a SIRIUS business.