{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-2EA20-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-2EA20-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-2EA20-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2EA20-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS first lateral auxiliary switch, 2 NO contacts, spring-loaded terminals, 10 A maximum, for 3RT1 contactors, snap-on mounting.","salesMarkdown":"The Siemens SIRIUS 3RH1921-2EA20-ZX95 is a first lateral auxiliary switch block that adds two normally-open (NO) contacts to a 3RT1 power contactor or contactor relay. It snaps onto the side of the contactor without tools, expanding the control circuit without increasing the panel's DIN-rail footprint. Rated for a maximum of 10 A, the switching capacity varies significantly with the applied DC voltage: 6 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, and 3 A at 400 V. These are not continuous ratings — they define the make/break capability for the auxiliary contacts in a control circuit. The spring-loaded terminals accept 2x (0.5... 2.5 mm²) stranded without ferrules, or 2x (0.5... 1.5 mm²) with core-end processing. AWG 20 to 14 for the auxiliary wiring. This is a tool-less connection — strip, insert, spring clamps it — which speeds panel wiring and eliminates screw-torque checks. ## Switching performance and durability Surge voltage resistance is 6 kV, and the insulation voltage at pollution degree 3 is 500 V AC. The 3RH1921-2EA20-ZX95 is an active product in the Siemens SIRIUS line. No end-of-life notice or successor has been issued.","metaTitle":"Siemens 3RH1921-2EA20-ZX95 SIRIUS Auxiliary Switch, 2 NO, 10","metaDescription":"Siemens SIRIUS 3RH1921-2EA20-ZX95 first lateral auxiliary switch with 2 NO contacts, spring-loaded terminals, rated 10 A. Active product, sourced to order. Snap-on for 3RT1 contact","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Note":"with 3RT1","Depth":"71 mm","Width":"10 mm","Height":"72.5 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":"2","With Core End Processing":"2x (0.5 ... 1.5 mm²)","Without Core End Processing":"2x (0.5 ... 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 ... 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":"500 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/42ef307c805ba26f1c84d5d435b3eb8f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=336607&mlfb=3RH1921-2EA20-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2EA20-ZX95/alternatives.json"},"ai":{"faq":[{"question":"What is the note 'with 3RT1' on this component?","answer":"The note indicates this auxiliary switch block is designed to mount laterally onto Siemens 3RT1 series contactors and contactor relays. It is not a standalone device — it must be snapped onto a 3RT1 base unit."},{"question":"Where can I buy 3RH1921-2EA20-ZX95 and how is it quoted?","answer":"This part is sourced to order against an RFQ through independent industrial-automation distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm quote."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-2EA20-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/3RH1921-2EA20-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}}