{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-2CA01","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-2CA01","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-2CA01","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2CA01","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH1921-2CA01 front-side auxiliary switch, 1 NC contact, spring-type terminal, for 3RT1 contactors, 10 A maximum rated current.","salesMarkdown":"The 3RH1921-2CA01 is a front-side auxiliary switch block from the Siemens SIRIUS family, designed to snap onto the front of 3RT1 contactors. These are the currents the NC contact can make and break under inductive load conditions typical of contactor coils and solenoid valves. The contact is rated for both AC and DC switching. The switch measures 10 mm wide, 38 mm high, and 51 mm deep — a slim footprint that adds negligible width to the contactor stack. It snaps onto the front of the 3RT1 contactor without tools; the spring-loaded terminals face forward for wiring access after mounting. The front face carries IP20 protection — finger-safe but not sealed against dust or moisture.","metaTitle":"Siemens 3RH1921-2CA01 SIRIUS auxiliary switch, 1 NC","metaDescription":"Siemens 3RH1921-2CA01 SIRIUS front-side auxiliary switch, 1 NC contact, spring-type terminal, rated 10 A max, for 3RT1 contactors.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Note":"with 3RT1","Depth":"51 mm","Width":"10 mm","title":"3RH1921-2CA01","Height":"38 mm","Maximum":"10 A","at 24 V":"6 A","at 60 V":"2 A","at 110 V":"1 A","at 125 V":"6 A","at 220 V":"0.3 A","at 230 V":"6 A","at 250 V":"6 A","at 400 V":"3 A","description":"front-side auxiliary switch, 1 NC contact, spring-type terminal, for contactors 3RT1","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","at 24 V rated value":"10 A","at 60 V rated value":"4.7 A","at 110 V rated value":"3 A","at 220 V rated value":"1.2 A","at 440 V rated value":"0.5 A","at 600 V rated value":"0.26 A","Instantaneous Contact":"0","With Core End Processing":"2x (0.5 ... 1.5 mm²)","Without Core End Processing":"2x (0.5 ... 2.5 mm²)","at AC-15 at 690 V rated value":"1 A","protection class IP on the front":"IP20","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 14)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Mechanical Service Life (Switching Cycles) Typical":"10 000 000","Type Of Electrical Connection For Auxiliary And Control Circuit":"spring-loaded terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$12.00","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/6dc5998b8490c52f4d2ef00432023f89.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=367737&mlfb=3RH1921-2CA01"},"ai":{"faq":[{"question":"What contactors does the 3RH1921-2CA01 mount on?","answer":"This auxiliary switch is designed for the Siemens 3RT1 contactor series. It snaps onto the front of the contactor to add one NC auxiliary contact."},{"question":"What is the maximum switching current of the 3RH1921-2CA01?","answer":"The maximum rated current is 10 A."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-2CA01","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/3RH1921-2CA01 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}