{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-1FE13","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-1FE13","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-1FE13","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1FE13","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 3RH1921-1FE13, 2 NC (solid-state-compatible) + 1 NO + 1 NC, snap-on mounting, IP20, 0.3 A at 24 V/60 V, 51 mm depth.","salesMarkdown":"It snaps onto the front of the contactor, adding one normally-open and one normally-closed contact, plus two normally-closed contacts that are rated solid-state-compatible for switching low-energy signals like PLC inputs or solid-state relay coils. The front IP20 protection keeps fingers out of the terminal area inside a control panel. The switch block is rated 0.3 A at both 24 V and 60 V — that is the continuous thermal current for the auxiliary contacts, not a motor-switching figure. It means the contacts are sized for control-circuit loads: relay coils, indicator lamps, or PLC digital inputs. For higher-current auxiliary switching you would step up to the standard 10 A contacts on a larger block. ## Panel integration — snap-on, screw terminals Mounting is snap-on onto the contactor front — no tools, no DIN rail required for the block itself. The screw-type terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) with core-end processing, or the AWG equivalents 2x (20 to 16) and 2x (18 to 14). Dimensions are 44 mm wide, 38 mm tall, 51 mm deep — the depth is the critical dimension for clearance between the contactor front and the enclosure door or busbar.","metaTitle":"Siemens 3RH1921-1FE13 SIRIUS Auxiliary Switch, 2 NC, 1 NO+1","metaDescription":"Siemens SIRIUS 3RH1921-1FE13 auxiliary switch block with 2 NC (solid-state-compatible) and 1 NO+1 NC contacts. Snap-on mounting, IP20, 0.3 A at 24 V/60 V. Phased-out; successor 3RH","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Note":"with 3RT1","Depth":"51 mm","Width":"44 mm","Height":"38 mm","at 24 V":"0.3 A","at 60 V":"0.3 A","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"snap-on mounting","Product Brand Name":"SIRIUS","Suitability For Use":"Contactor relay and power contactor","Instantaneous Contact":"1","With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","protection class IP on the front":"IP20","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Mechanical Service Life (Switching Cycles) Typical":"5 000 000","Type Of Electrical Connection For Auxiliary And Control Circuit":"screw-type terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=485324&mlfb=3RH1921-1FE13","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1FE13/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH1921-1FE13 and get current pricing?","answer":"The 3RH1921-1FE13 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What does 'with 3RT1' mean in the note for 3RH1921-1FE13?","answer":"The note 'with 3RT1' indicates this auxiliary switch block is designed to mount on Siemens SIRIUS 3RT1 series contactors and contactor relays. It snaps onto the front of those devices to add auxiliary contacts."},{"question":"What is the depth of 3RH1921-1FE13?","answer":"The depth of the 3RH1921-1FE13 auxiliary switch block is 51 mm. This is the dimension from the contactor face outward toward the enclosure door — critical for clearance when mounted in a panel."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-1FE13","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3RH1921-1FE13 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}