{"product_id":"siemens-sirius-3rb21-electronic-overload-relays-adjustable-class","title":"Siemens SIRIUS 3RB21 Electronic Overload Relays (S6–S12, Adj. Class)","description":"\u003cp class=\"ps-intro\"\u003eSIRIUS 3RB21 electronic overload relays with adjustable trip class 5E to 30E protect motors from 50 A to 630 A in sizes S6 to S12.\u003c\/p\u003e\u003ch4 class=\"ps-h\"\u003eKey features\u003c\/h4\u003e\u003cul class=\"ps-feat\"\u003e\n\u003cli\u003eTrip class adjustable: 5E, 10E, 20E or 30E\u003c\/li\u003e\n\u003cli\u003eSetting ranges 50-200 A, 55-250 A and 160-630 A\u003c\/li\u003e\n\u003cli\u003eBusbar connection or straight-through transformer versions\u003c\/li\u003e\n\u003cli\u003eFor mounting on contactors and stand-alone installation\u003c\/li\u003e\n\u003cli\u003eAuxiliary contacts 1 NO + 1 NC, manual\/automatic RESET, TEST and self-monitoring\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\u003eClass\u003c\/th\u003e\n\u003ctd\u003e5E\/10E\/20E\/30E adjustable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct line\u003c\/th\u003e\n\u003ctd\u003eSIRIUS 3RB2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAux. contacts\u003c\/th\u003e\n\u003ctd\u003e1 NO + 1 NC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower supply\u003c\/th\u003e\n\u003ctd\u003eInternal\u003c\/td\u003e\n\u003c\/tr\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\u003eCatalog section\u003c\/th\u003e\n\u003ctd\u003eIC 10 ch. 7 Protection equipment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCategory\u003c\/th\u003e\n\u003ctd\u003eElectronic Overload Relays\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePoles\u003c\/th\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRated frequency\u003c\/th\u003e\n\u003ctd\u003e50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSource\u003c\/th\u003e\n\u003ctd\u003eSiemens Catalog IC 10 · 2026, p. 7\/103-7\/103\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\u003e3RB2153-4FC2\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eSize: S6 | Setting range: 50–200 A | Motor rating: 30–90 kW | Version: Busbar connection | Connection: Screw (aux. circuit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RB2153-4FF2\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eSize: S6 | Setting range: 50–200 A | Motor rating: 30–90 kW | Version: Busbar connection | Connection: Spring-loaded (aux. circuit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RB2153-4FW2\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eSize: S6 | Setting range: 50–200 A | Motor rating: 30–90 kW | Version: Straight-through transformer | Connection: Screw (aux. circuit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RB2153-4FX2\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eSize: S6 | Setting range: 50–200 A | Motor rating: 30–90 kW | Version: Straight-through transformer | Connection: Spring-loaded (aux. circuit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RB2163-4GC2\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eSize: S10\/S12 | Setting range: 55–250 A | Motor rating: 30–132 kW | Version: Busbar connection | Connection: Screw (aux. circuit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RB2163-4GF2\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eSize: S10\/S12 | Setting range: 55–250 A | Motor rating: 30–132 kW | Version: Busbar connection | Connection: Spring-loaded (aux. circuit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RB2163-4MC2\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eSize: S10\/S12 | Setting range: 160–630 A | Motor rating: 90–355 kW | Version: Busbar connection | Connection: Screw (aux. circuit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3RB2163-4MF2\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eSize: S10\/S12 | Setting range: 160–630 A | Motor rating: 90–355 kW | Version: Busbar connection | Connection: Spring-loaded (aux. circuit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":67534405697826,"sku":"3RB2153-4FC2","price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1021\/0744\/7586\/files\/siemens-sirius-3rb21-electronic-overload-relays-adjustable-class.jpg?v=1792131831","url":"https:\/\/prosourcemro.com\/products\/siemens-sirius-3rb21-electronic-overload-relays-adjustable-class","provider":"ProSource MRO","version":"1.0","type":"link"}