{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-1CA10-ZW95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-1CA10-ZW95","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-1CA10-ZW95","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1CA10-ZW95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH1921-1CA10-ZW95 auxiliary switch, 1 NO, for S0 contactor relay and power contactor, snap-on front mounting, mirror contact per IEC 60947-4-1, IP20 front, AC-15 6 A at 230 V.","salesMarkdown":"## S0 auxiliary switch for contactor front-mount It carries one normally open instantaneous contact and is rated as a mirror contact per IEC 60947-4-1 when used with 3RT1 contactors — meaning the NO position mechanically mirrors the main contact state, critical for safety circuits that need positive feedback of contactor weld or dropout. The switch block measures 10 mm wide, 51 mm deep, and 38 mm high, fitting the standard S0 footprint without consuming extra DIN rail space. Snap it onto the contactor front, wire the terminals — 2x (0.5…1.5 mm²) solid or 2x (0.75…2.5 mm²) stranded, or 2x (20…16) AWG / 2x (18…14) AWG — and it's live. IP20 on the front face keeps fingers out but expects enclosure protection beyond that. The auxiliary contact is rated for AC-15 (solenoid/contactor coil) and DC-13 (electromagnet) loads at multiple voltages. At 230 V AC, it switches 6 A; at 400 V AC, 3 A; at 690 V AC, 1 A. For DC circuits, it handles 10 A at 24 V, 4.7 A at 60 V, 1.2 A at 220 V, and 0.26 A at 600 V. These are the operational currents — match them to your coil inrush or holding load, not the main contactor's motor current. Substance prohibitance date is July 1, 2006, indicating RoHS compliance from that point. It is designed as a mirror contact per IEC 60947-4-1, which implies the manufacturer has submitted it to the relevant type tests under that standard.","metaTitle":"Siemens 3RH1921-1CA10-ZW95 SIRIUS Auxiliary Switch, S0 Snap-","metaDescription":"Siemens SIRIUS 3RH1921-1CA10-ZW95 auxiliary switch for S0 contactors. Snap-on mounting, 1 NO contact, mirror contact per IEC 60947-4-1. AC-15 rated 6 A at 230 V. IP20 front. Active","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=313031&mlfb=3RH1921-1CA10-ZW95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1CA10-ZW95/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH1921-1CA10-ZW95 and what is the lead time?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."},{"question":"What is the closest functional second-source for 3RH1921-1CA10-ZW95?","answer":"The 3RH2122-1BA40 is a different block — 2 NO contacts instead of 1 NO, and a different form factor. It will not drop into a panel wired for the 3RH1921-1CA10-ZW95 without rewiring the extra contact and checking the S0 mounting compatibility. Stick with the exact order code for a drop-in replacement."},{"question":"What compliance documentation does Siemens provide for 3RH1921-1CA10-ZW95?","answer":"The part is RoHS compliant (substance prohibitance date July 1, 2006) and designed as a mirror contact per IEC 60947-4-1. Standard Siemens SIRIUS declaration of conformity and RoHS certificates are available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-1CA10-ZW95","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-ZW95 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}}