{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-1FB22-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-1FB22-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-1FB22-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-1FB22-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2911-1FB22-ZX95 auxiliary switch, front-mount, 2 NO + 2 NC, 10 A maximum, screw terminals, snap-on DIN rail.","salesMarkdown":"## What this auxiliary switch does in the panel The 3RH2911-1FB22-ZX95 is a front-mounted auxiliary switch block for Siemens SIRIUS contactor relays (3RH2) and power contactors (3RT2). It adds 2 normally-open and 2 normally-closed contacts to the base device, with a defined contact sequence: one NO leading, one NC lagging, and the remaining NO and NC instantaneous. Rated for a maximum thermal current of 10 A, with AC-15 switching at 690 V rated at 1 A. DC ratings drop with voltage: 10 A at 24 V, 6 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, 0.5 A at 440 V, and 0.26 A at 600 V — the DC arc extinction limits the current as voltage rises. Snap-on mounting to DIN rail (35 mm) — no tools required. Dimensions are 36 mm wide, 37.5 mm tall, and 43.7 mm deep, fitting standard panel cutouts for SIRIUS contactor accessories. ## Sourcing and lifecycle — active production, no obsolescence concern Sourced to order against your BOM quantity. ## Wiring and contact reliability for control circuits Screw-type terminals accept 2x (0.5 to 1.5 mm²) and 2x (0.75 to 2.5 mm²) conductors, or 2x (20 to 16 AWG) and 2x (18 to 14 AWG). The dual-wire capacity per clamp simplifies daisy-chaining control signals without extra terminal blocks. Contact reliability is specified at 1 faulty switching per 100 million operations at 17 V and 1 mA — this low-level switching performance matters for PLC input circuits where dry contacts must pass milliamps without oxide film resistance. Mechanical service life is 10 million switching cycles typical, which covers most control applications over a 10-15 year panel life without replacement. ## Insulation coordination and environmental limits Rated insulation voltage is 690 V AC at pollution degree 3, with a surge voltage resistance of 6 kV. This means the switch can be used in 400/480 V panels without additional creepage or clearance concerns, even in dusty or conductive environments (PD3). Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C. Front protection class is IP20 — suitable for enclosed panels where the switch is not exposed to direct contact or dripping water.","metaTitle":"Siemens 3RH2911-1FB22-ZX95 Auxiliary Switch, 10 A, SIRIUS","metaDescription":"Siemens 3RH2911-1FB22-ZX95 SIRIUS auxiliary switch, 2 NO + 2 NC, 10 A max, snap-on DIN rail. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"43.7 mm","Width":"36 mm","title":"3RH2911-1FB22-ZX95","Height":"37.5 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","description":"auxiliary switch, on the front, 2 NO + 2 NC, 11 U,.3/.4,.1/.2,.5/.6,.7/.8, current path: 1 NO, 1 NC, 1 NC, 1 NO, 1 NC (lagging), 1 NO (leading), screw terminal, for contactors 3RT2 and contactor relays 3RH2, reusable packaging, pack = 351 units","During Storage":"-55 ... +80 °C","Leading Contact":"1","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"snap-on mounting","Lagging Switching":"1","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), 2x (0.75 ... 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 ... 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":"690 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e0adb5e4500a438528b91d2f95dbe1bf.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=56974&mlfb=3RH2911-1FB22-ZX95"},"ai":{"faq":[{"question":"What is the contact sequence on this auxiliary switch block?","answer":"The 3RH2911-1FB22-ZX95 has 2 NO + 2 NC contacts arranged as: one NO leading contact (closes before the main contacts), one NC lagging contact (opens after the main contacts), plus one instantaneous NO and one instantaneous NC. This sequence is critical for applications like star-delta starters or reversing contactors where timing matters."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-1FB22-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/3RH2911-1FB22-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}}