{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-2CA01-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-2CA01-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-2CA01-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2CA01-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS front-side auxiliary switch, 1 NC contact, spring-type terminals, 10 A at 24 V, for 3RT1 contactors, snap-on mounting, IP20.","salesMarkdown":"The Siemens 3RH1921-2CA01-ZX95 is a front-side auxiliary switch block from the SIRIUS family, carrying one normally-closed (NC) contact in a 10 mm-wide housing. It is designed to snap onto 3RT1 contactors, adding a feedback or interlock contact without expanding the panel footprint beyond the contactor's own width. The spring-loaded terminals accept 2x (0.5... 1.5 mm²) with ferrule or 2x (0.5... 2.5 mm²) solid, matching the wiring practice on a typical DIN-rail assembly. At higher voltages the current derates: 6 A at 24 V DC, 2 A at 60 V DC, 1 A at 110 V DC, and 0.3 A at 220 V DC. For AC loads at 400 V it handles 3 A, and at 690 V it carries 1 A in AC-15 duty. The 6 kV surge voltage resistance and 690 V rated insulation voltage (pollution degree 3) mean it lives comfortably in a 400 V motor-control panel without extra isolation. ## Mechanical endurance and contact reliability That low-level switching capability matters for PLC inputs or safety relay feedback where dry-contact signals must be consistent over years of operation. ## Environmental limits and mounting The snap-on fastening method clips directly onto the contactor's front side — no tools, no extra DIN rail space. Front protection is IP20, standard for enclosed control panels.","metaTitle":"Siemens 3RH1921-2CA01-ZX95 SIRIUS Auxiliary Switch, 1 NC, 10","metaDescription":"Siemens SIRIUS 3RH1921-2CA01-ZX95 front-side auxiliary switch, 1 NC contact, spring-type terminals, rated 10 A at 24 V. Active production, snap-on for 3RT1 contactors. Quoted to or","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","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","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":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=412802&mlfb=3RH1921-2CA01-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2CA01-ZX95/alternatives.json"},"ai":{"faq":[{"question":"What does the 'with 3RT1' note mean on this auxiliary switch?","answer":"It means the 3RH1921-2CA01-ZX95 is designed to mount directly onto Siemens 3RT1 contactors. The snap-on interface is specific to that contactor series."},{"question":"How do I get current pricing and availability for 3RH1921-2CA01-ZX95?","answer":"Submit an RFQ through this listing. Availability and current pricing are confirmed at quote time through independent distribution channels."},{"question":"What are the key ratings for this auxiliary switch?","answer":"Rated 10 A at 24 V (AC-15/DC-13), derating to 6 A at 24 V DC, 3 A at 400 V AC, and 1 A at 690 V AC. Insulation voltage is 690 V with 6 kV surge resistance."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-2CA01-ZX95","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-ZX95 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}}