Temperature monitoring relay PT100, thermocouple J, K 1 threshold value, width 22.5 mm Overshoot and undershoot AC/DC 24 V 1 changeover contact, closed-circuit principle screw connection Temperature monitoring relay SIRIUS 3RS2 for measuring temperatures in solid, liquid and gaseous media, e.g. for controlling and regulating processes or for protecting motors and systems from inadmissible temperatures. The devices are easy to operate using rotary and slide switches, the hysteresis is adjustable. The relays are suitable for sensor types PT100, PT1000, thermocouples type J and type K. The family of temperature monitoring relays 3RS consists of analog and digitally adjustable relays for connecting one to three sensors (resistance sensor or thermocouple). They are available with removable screw or spring-loaded terminals. Variants with communication via IO-Link are also available. Nameplates, push-in tabs and sealable cover caps are available as accessories. SIRIUS Relays - a program for all situations.