{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-1DA11-ZW95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-1DA11-ZW95","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-1DA11-ZW95","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1DA11-ZW95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS first lateral auxiliary switch, 1 NO + 1 NC, screw-type terminals, 10 A, snap-on mounting for 3RT1 contactors, order code 3RH1921-1DA11-ZW95.","salesMarkdown":"It is explicitly designed for use with 3RT1 contactors — the \"with 3RT1\" note on the order code tells you it snaps onto the side of those power contactor frames, not the 3RT2 or 3RT5 series. Snap-on mounting onto the contactor profile means no tools or extra brackets for panel integration; the 10 mm width keeps the assembly compact on the DIN rail. ## What the contact ratings mean for your circuit The auxiliary contacts are rated 10 A maximum, with specific current-carrying capacities at different voltages: 10 A at 24 V, 6 A at 125 V, 6 A at 230 V, and 3 A at 400 V. These are the thermal continuous currents the contacts can handle — the actual switching capacity for motor or inductive loads will be lower and governed by the AC/DC utilization category of your application. The gold-flash or silver-nickel alloy on these contacts handles that regime reliably. The multi-unit packaging of 252 pieces per case (noted in the description) means it ships in bulk for OEM or panel-shop volume; single-unit orders are typically re-packed from that case quantity. Snap-on mounting onto the 3RT1 contactor profile — no DIN rail footprint of its own, it rides on the contactor body. Screw-type terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) with core-end processing, or 2x (20 to 16 AWG) and 2x (18 to 14 AWG) for stranded wire.","metaTitle":"Siemens 3RH1921-1DA11-ZW95 SIRIUS Auxiliary Switch, 1NO+1NC,","metaDescription":"Siemens 3RH1921-1DA11-ZW95 SIRIUS first lateral auxiliary switch, 1 NO + 1 NC, screw terminals, 10 A rated at 24 V, snap-on for 3RT1 contactors. Current lifecycle stage. Sourced to","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Note":"with 3RT1","Depth":"71 mm","Width":"10 mm","Height":"80 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","Instantaneous Contact":"1","With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","protection class IP on the front":"IP20","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 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":"screw-type terminals","insulation voltage with degree of pollution 3 at AC rated value":"500 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=268759&mlfb=3RH1921-1DA11-ZW95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-1DA11-ZW95/alternatives.json"},"ai":{"faq":[{"question":"What does the 'with 3RT1' note mean on this order code?","answer":"It means this auxiliary switch block is mechanically designed to snap onto Siemens 3RT1 series contactors. It will not fit 3RT2 or 3RT5 frames without an adapter."},{"question":"Where can I buy 3RH1921-1DA11-ZW95 and get current pricing?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What is the contact rating at 24 VDC for this auxiliary switch?","answer":"The contacts are rated 10 A at 24 V for continuous current. For inductive DC loads, derate according to the DC-13 switching capacity curve."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-1DA11-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/3RH1921-1DA11-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}}