Siemens Sirius 3RN2 Thermistor Relay for motor protection

Thermistor motor protection relay Standard evaluation unit 22.5 mm housing Spring type clamp 2 changeover contacts US = 24 V AC/DC Manual/Auto/Remote reset with ATEX approval 2 LEDs (READY/TRIPPED) galvanic isolation Test/reset button Wire break monitoring Short circuit monitoring non-volatile Thermistor motor protection relay SIRIUS 3RN2 to protect motors from overheating, including in potentially explosive atmospheres, using direct temperature measurement with ATEX approval. Direct measurement of the motor winding temperature means the motor is protected even under abnormal conditions such as heavy start, braking state, frequent switching or insufficient cooling, thus making cautious oversizing of the motor unnecessary. The devices can be used to protect motors in atmospheres where there is a possibility of gas or dust explosions. It is not necessary to set unit parameters, as PTC sensors are used. LEDs enable quick fault diagnosis. The devices are climate resistant, safe to touch and can be used worldwide thanks to their wide voltage range and international certifications. Available as monostable or bistable evaluation unit, with and without ATEX approval, with one or two sensor circuits as well as auto-RESET, manual RESET and/or remote RESET. The devices are available with screw or spring-loaded (push-in) terminals. Versions are available in widths of 17.5 mm or 22.5 mm, for TH35 DIN rail or for screw mounting with adapter (accessories) as well as with hard gold-plated contacts. Standardized accessories for all unit versions, such as removable terminals, push-in feet and coding pins, simplify selection and storage. 3RN2 thermistor motor protection relays replace the proven 3RN1 series. SIRIUS relays - a series for every application.