{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1921-2EE02-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1921-2EE02-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RH1921-2EE02-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1921-2EE02-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH1921-2EE02-ZX95 first lateral auxiliary switch, 2 NC contacts, encapsulated solid-state compatible, spring-type terminals, for 3RT1 contactors, 10 mm width, IP20 front.","salesMarkdown":"## What This Auxiliary Switch Block Is and Where It Fits The 3RH1921-2EE02-ZX95 is a first lateral auxiliary switch block from the Siemens SIRIUS family, designed to snap onto the side of a 3RT1 contactor or contactor relay. The note 'with 3RT1' in the spec is the compatibility anchor — this block mounts specifically on that contactor series, not on a DIN rail or a different frame size. It provides 2 normally-closed (NC) contacts in an encapsulated housing, rated for solid-state compatibility. The spring-loaded terminals (cage clamp) accept 2x (0.5 to 2.5 mm²) without core end processing, or 2x (0.5 to 1.5 mm²) with ferrules, plus 2x (20 to 14 AWG) for auxiliary circuits. ## Contact Ratings and Switching Reliability The contact ratings vary by voltage: 0.3 A at 24 V and 60 V, 3 A at 110 V, and 1 A at 220 V. The 3 A at 110 V figure is the load-bearing spec for AC pilot duty in North American control circuits; the 1 A at 220 V covers European 230 V control loops. The 0.3 A at 24/60 V is the DC switching limit — relevant if you're switching a DC solenoid or indicator lamp. Contact reliability is specified at 1 faulty switching per 100 million operations at 17 V, 1 mA. This is the low-level signal reliability figure — it tells you the block can handle dry switching into a PLC input or solid-state load without the contact oxidation that plagues standard contacts at milliampere levels. Mechanical service life is 10 million switching cycles typical. That's a long-life block for high-cycle applications like packaging lines or conveyor systems where the auxiliary follows the main contactor every machine cycle. ## Environmental and Electrical Ratings The block measures 10 mm wide by 72.5 mm high by 71 mm deep — the 10 mm width is the space it occupies on the contactor side, so it adds minimal footprint to the contactor assembly. Snap-on mounting means it clips directly onto the 3RT1 contactor without tools. Rated insulation voltage is 500 V at pollution degree 3, with a surge voltage resistance of 6 kV. This covers 480 V panel applications with adequate clearance for transient overvoltages. IP20 on the front means finger-safe but not washdown — suitable for enclosed panels only. Operating temperature range is -25 to +60 °C, storage range -55 to +80 °C. The storage range is wider than operation, which matters if the block sits in a warehouse or on a shelf before installation.","metaTitle":"Siemens 3RH1921-2EE02-ZX95 SIRIUS Auxiliary Switch, 2 NC","metaDescription":"Siemens SIRIUS 3RH1921-2EE02-ZX95 first lateral auxiliary switch, 2 NC contacts, spring-type terminals, for 3RT1 contactors. Rated 3 A at 110 V, 1 A at 220 V.","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-ZX95","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 Reusable packaging = 144 units","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/759fbe0a7f5b95f55c80070e54525559.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=507659&mlfb=3RH1921-2EE02-ZX95"},"ai":{"faq":[{"question":"What contactor does 3RH1921-2EE02-ZX95 mount on?","answer":"This auxiliary switch block is designed specifically for the Siemens 3RT1 contactor series. The spec note 'with 3RT1' confirms the compatibility — it snaps onto the side of that contactor frame, not onto a DIN rail or a different series."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1921-2EE02-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/3RH1921-2EE02-ZX95 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}}