{"product_id":"siemens-sirius-3rr21-3rr22-current-monitoring-relays","title":"Siemens SIRIUS 3RR21 \/ 3RR22 Current Monitoring Relays (1.6-80 A)","description":"\u003cp class=\"ps-intro\"\u003eSIRIUS 3RR21 and 3RR22 current and active current monitoring relays for direct mounting on 3RT2 contactors sizes S00 to S2.\u003c\/p\u003e\u003ch4 class=\"ps-h\"\u003eKey features\u003c\/h4\u003e\u003cul class=\"ps-feat\"\u003e\n\u003cli\u003eBasic versions 3RR21: analog setting, 2-phase apparent current monitoring\u003c\/li\u003e\n\u003cli\u003eStandard versions 3RR22: digital setting, LC display, 3-phase active or apparent current\u003c\/li\u003e\n\u003cli\u003ePhase sequence, residual current and blocking current monitoring (3RR22)\u003c\/li\u003e\n\u003cli\u003eMeasuring ranges 1.6 ... 16 A, 4 ... 40 A and 8 ... 80 A\u003c\/li\u003e\n\u003cli\u003eSupply 24 V AC\/DC or 24 ... 240 V AC\/DC\u003c\/li\u003e\n\u003cli\u003eScrew or spring-loaded terminals\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4 class=\"ps-h\"\u003eSpecifications\u003c\/h4\u003e\u003ctable class=\"ps-kv\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eSiemens\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct line\u003c\/th\u003e\n\u003ctd\u003eSIRIUS 3RR2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFunction\u003c\/th\u003e\n\u003ctd\u003eCurrent \/ active current monitoring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMounting\u003c\/th\u003e\n\u003ctd\u003eOn 3RT2 contactors or stand-alone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCategory\u003c\/th\u003e\n\u003ctd\u003eMonitoring Relays\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSource\u003c\/th\u003e\n\u003ctd\u003eSiemens Catalog IC 10 · 2026, p. 953\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ctable class=\"ps-src\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2141-1AA30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Basic | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 6.25% of threshold | Supply: 24 V AC\/DC | Connection: Screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2141-2AA30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Basic | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 6.25% of threshold | Supply: 24 V AC\/DC | Connection: Spring-loaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2141-1AW30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Basic | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 6.25% of threshold | Supply: 24 ... 240 V AC\/DC | Connection: Screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2141-2AW30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Basic | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 6.25% of threshold | Supply: 24 ... 240 V AC\/DC | Connection: Spring-loaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2142-1AA30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Basic | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 6.25% of threshold | Supply: 24 V AC\/DC | Connection: Screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2142-2AA30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Basic | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 6.25% of threshold | Supply: 24 V AC\/DC | Connection: Spring-loaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2142-1AW30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Basic | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 6.25% of threshold | Supply: 24 ... 240 V AC\/DC | Connection: Screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2142-2AW30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Basic | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 6.25% of threshold | Supply: 24 ... 240 V AC\/DC | Connection: Spring-loaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2143-1AA30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Basic | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 6.25% of threshold | Supply: 24 V AC\/DC | Connection: Screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2143-3AA30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Basic | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 6.25% of threshold | Supply: 24 V AC\/DC | Connection: Spring-loaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2143-1AW30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Basic | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 6.25% of threshold | Supply: 24 ... 240 V AC\/DC | Connection: Screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2143-3AW30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Basic | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 6.25% of threshold | Supply: 24 ... 240 V AC\/DC | Connection: Spring-loaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2241-1FA30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Standard | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 0.1 ... 3 A | Supply: 24 V AC\/DC | Connection: Screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2241-2FA30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Standard | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 0.1 ... 3 A | Supply: 24 V AC\/DC | Connection: Spring-loaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2241-1FW30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Standard | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 0.1 ... 3 A | Supply: 24 ... 240 V AC\/DC | Connection: Screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2241-2FW30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Standard | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 0.1 ... 3 A | Supply: 24 ... 240 V AC\/DC | Connection: Spring-loaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2242-1FA30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Standard | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 0.1 ... 8 A | Supply: 24 V AC\/DC | Connection: Screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2242-2FA30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Standard | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 0.1 ... 8 A | Supply: 24 V AC\/DC | Connection: Spring-loaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2242-1FW30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Standard | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 0.1 ... 8 A | Supply: 24 ... 240 V AC\/DC | Connection: Screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2242-2FW30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Standard | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 0.1 ... 8 A | Supply: 24 ... 240 V AC\/DC | Connection: Spring-loaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2243-1FA30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Standard | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 0.2 ... 16 A | Supply: 24 V AC\/DC | Connection: Screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2243-3FA30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Standard | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 0.2 ... 16 A | Supply: 24 V AC\/DC | Connection: Spring-loaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2243-1FW30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Standard | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 0.2 ... 16 A | Supply: 24 ... 240 V AC\/DC | Connection: Screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RR2243-3FW30\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eVersion: Standard | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 0.2 ... 16 A | Supply: 24 ... 240 V AC\/DC | Connection: Spring-loaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":67535295381794,"sku":"3RR2141-1AA30","price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1021\/0744\/7586\/files\/siemens-sirius-3rr21-3rr22-current-monitoring-relays.jpg?v=1792150147","url":"https:\/\/prosourcemro.com\/products\/siemens-sirius-3rr21-3rr22-current-monitoring-relays","provider":"ProSource MRO","version":"1.0","type":"link"}