{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-2CA10-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-2CA10-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-2CA10-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2CA10-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, front-side auxiliary switch, 1 NO contact, spring-loaded terminals, for 3RT1 contactors, 3RH1921-2CA10-ZX95, rated 10 A max, snap-on mounting.","salesMarkdown":"The Siemens 3RH1921-2CA10-ZX95 is a front-side auxiliary switch block from the SIRIUS family, designed to snap onto 3RT1 contactors. It adds one normally-open (NO) contact for feedback or control logic, wired via spring-loaded terminals that accept 2x (0.5…2.5 mm²) stranded or 2x (20…14 AWG) solid conductors. Rated for 10 A maximum, with a switching curve that drops as voltage rises — 6 A at 24 V, 3 A at 400 V, 0.26 A at 600 V — so it handles both 24 VDC control circuits and higher-voltage signal switching within the same block. The AC-15 rating at 690 V is 1 A, covering inductive pilot-duty loads. Snap-on mounting clips directly to the front of a 3RT1 contactor — no tools needed. Dimensions are 10 mm wide, 38 mm tall, 51 mm deep, so it adds minimal width to the contactor stack. Spring-loaded terminals (cage-clamp style) accept up to 2x 1.5 mm² with ferrules or 2x 2.5 mm² bare stranded. Strip length is standard 8–10 mm. No screw torque to check — just push the spring, insert, release. The 10 A maximum is the thermal continuous current (Ith). The real-world switching capacity depends on voltage and load type: at 24 V it switches 6 A (resistive) or 10 A (rated value for the 24 V DC coil circuit). For AC-15 pilot duty at 690 V, it's rated 1 A — enough for a contactor coil or small solenoid. Mechanical life is 10 million cycles typical, so it outlasts most contactors it rides on. That covers industrial panel environments with moderate contamination (dust, non-condensing humidity).","metaTitle":"Siemens 3RH1921-2CA10-ZX95 SIRIUS Auxiliary Switch, 1 NO, Sp","metaDescription":"Siemens SIRIUS 3RH1921-2CA10-ZX95 front-side auxiliary switch, 1 NO contact, spring-loaded terminals, rated 10 A max. Active production. Snap-on for 3RT1 contactors. Quoted to orde","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":"1","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=490883&mlfb=3RH1921-2CA10-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2CA10-ZX95/alternatives.json"},"ai":{"faq":[{"question":"What wire size fits the spring terminals?","answer":"Accepts 2x (0.5…2.5 mm²) without ferrules, or 2x (0.5…1.5 mm²) with ferrules. AWG equivalent is 2x (20…14)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-2CA10-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/3RH1921-2CA10-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}}