{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-1CA10-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-1CA10-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-1CA10-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1CA10-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch, 1 NO, snap-on front mounting for S0 contactors, 10 A AC-12, 6 A at 230 V, mirror contact per IEC 60947-4-1.","salesMarkdown":"Rated for 10 A continuous in AC-12 duty (resistive loads) and 6 A at 230 V, it handles typical control-circuit switching for contactor coils, pilot lights, and PLC inputs across a range of voltages: 6 A at 24 V, 2 A at 48/60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220/250 V, and 3 A at 400 V. The contact is a mirror contact per IEC 60947-4-1 when used with a 3RT1 contactor, meaning its NO position mechanically mirrors the main contactor poles — critical for safety circuits where a welded main contact must not be masked by a false auxiliary feedback. Snaps onto the front of a size S0 contactor (3RT1 series) — no tools, no DIN-rail space consumed. Dimensions are 51 mm deep, 10 mm wide, 38 mm tall, so it adds negligible depth to the contactor body. Terminals accept 2 x (0.5…1.5 mm²) or 2 x (0.75…2.5 mm²) solid/stranded, or 2 x (20…16) / 2 x (18…14) AWG. Front protection is IP20 — fine inside an enclosure, not for washdown zones. ## Reliability and compliance Surge voltage withstand is 6 kV. The part carries a substance prohibitance date of 07/01/2006, indicating RoHS compliance from that date.","metaTitle":"Siemens 3RH1921-1CA10-ZX95 SIRIUS Auxiliary Switch, 1 NO, sn","metaDescription":"Siemens 3RH1921-1CA10-ZX95 SIRIUS auxiliary switch for S0 contactors. 1 NO, snap-on front mount, mirror contact per IEC 60947-4-1. Rated 10 A AC-12, 6 A at 230 V. Sourced to order","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"51 mm","Width":"10 mm","Height":"38 mm","at 24 V":"6 A","at 48 V":"2 A","at 60 V":"2 A","at 110 V":"1 A","at 125 V":"0.9 A","at 220 V":"0.3 A","at 230 V":"6 A","at 250 V":"0.3 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 Category":"Auxiliary switch","Size Of Contactor":"S0","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"auxiliary switch","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","Design Of The Product":"for snapping onto the front","Instantaneous Contact":"1","Substance Prohibitance (Date)":"07/01/2006","protection class IP on the front":"IP20","Surge Voltage Resistance Rated Value":"6 kV","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","mirror contact according to IEC 60947-4-1":"Yes; with 3RT1","operational current at AC-15 at 690 V rated value":"1 A","Mechanical Service Life (Operating Cycles) Typical":"10 000 000","operational current of auxiliary contacts at AC-12 maximum":"10 A","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","number of CO contacts of auxiliary contacts instantaneous contact":"0","AWG number as coded connectable conductor cross section for auxiliary contacts":"20 ... 14"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d5b44e910fe19f8001b283029214028f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=476566&mlfb=3RH1921-1CA10-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1CA10-ZX95/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH1921-1CA10-ZX95 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or price is published here."},{"question":"What is the depth of 3RH1921-1CA10-ZX95?","answer":"The depth is 51 mm, measured from the mounting face of the contactor front."},{"question":"What is the width of 3RH1921-1CA10-ZX95?","answer":"The width is 10 mm — it occupies a single 10 mm slot on the contactor front."},{"question":"Will 3RH1921-1CA10-ZX95 drop into a panel specified around 3RH2122-1BA40?","answer":"No. The 3RH1921-1CA10-ZX95 is designed for S0 contactors (snap-on front mount), while the 3RH2122-1BA40 is for larger S2/S3 frames. They are not mechanically interchangeable without changing the contactor base."},{"question":"What compliance documentation does Siemens provide for 3RH1921-1CA10-ZX95?","answer":"The part carries a substance prohibitance date of 07/01/2006, indicating RoHS compliance. It is designed as a mirror contact per IEC 60947-4-1. Full declaration and UL/CSA file numbers are available from Siemens on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-1CA10-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/3RH1921-1CA10-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}}