{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-2EE02","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-2EE02","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-2EE02","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2EE02","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH1921-2EE02 lateral auxiliary switch, 2 NC contacts, encapsulated solid-state compatible, spring-type terminals, for 3RT1 contactors, snap-on mounting, IP20 front.","salesMarkdown":"## 2 NC auxiliary switch for 3RT1 contactors The Siemens 3RH1921-2EE02 is a lateral auxiliary switch block designed to snap onto the side of 3RT1 contactors, adding two normally-closed (NC) contacts. The contacts are encapsulated and rated as solid-state compatible, meaning they switch reliably at the low voltages and currents typical of PLC inputs and electronic control circuits. This rating confirms the switch will close consistently on dry logic-level signals without adding a sealing current resistor. ## Switching capacity across control voltages The 3 A / 110 V figure covers most 110 VAC control relay and contactor coil loads; the 0.3 A at 24 V is sufficient for a bank of PLC digital inputs or a small indicator lamp string. Mechanical service life is 10 million switching cycles typical, with surge voltage resistance rated at 6 kV and insulation voltage at 500 V for pollution degree 3. The IP20 front protection means the switch is touch-safe on the front face but not sealed against dust ingress into the enclosure. ## Snap-on mounting and spring termination The switch snaps onto the contactor without tools — the fastening method is snap-on mounting, and the 10 mm width means it adds minimal DIN rail space to the contactor assembly. The 71 mm depth and 72.5 mm height match the 3RT1 contactor envelope, so the assembled pair fits standard control panel cutouts and enclosure depths without interference.","metaTitle":"Siemens 3RH1921-2EE02 SIRIUS lateral auxiliary switch, 2 NC","metaDescription":"Siemens 3RH1921-2EE02 SIRIUS lateral auxiliary switch, 2 NC contacts, spring-loaded terminals, for 3RT1 contactors. Active production, sourced to order.","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","title":"3RH1921-2EE02","Height":"72.5 mm","at 24 V":"0.3 A","at 60 V":"0.3 A","at 110 V":"3 A","at 220 V":"1 A","description":"first lateral auxiliary switch 2 NC contacts, encapsulated (solid-state compatible), spring-type terminal, for contactors 3RT1","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","Instantaneous Contact":"0","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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/2b75db0d0c89662568ca5f591bf6c59f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=300093&mlfb=3RH1921-2EE02"},"ai":{"faq":[{"question":"What contactors does the 3RH1921-2EE02 mount on?","answer":"The 3RH1921-2EE02 is designed for use with 3RT1 contactors. It snaps onto the lateral side of the contactor to add two NC auxiliary contacts without increasing the panel depth beyond the contactor envelope."},{"question":"How can I order the 3RH1921-2EE02 and check availability?","answer":"The 3RH1921-2EE02 is sourced to order through independent distribution. No stock-holding claim is made — each order is quoted against the BOM."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-2EE02","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/3RH1921-2EE02 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}