{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-4NF02","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-4NF02","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-4NF02","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4NF02","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2911-4NF02 auxiliary switch, solid-state compatible, 2 NC contacts, 690 V insulation voltage, snap-on front mounting for contactors size S00–S3, ring terminal lug connection.","salesMarkdown":"## Solid-State-Compatible 2 NC Auxiliary Switch for SIRIUS Contactors The 3RH2911-4NF02 is a front-mounted auxiliary switch designed for the SIRIUS 3RT2 contactor and 3RH2 contactor relay series. It provides two normally-closed (NC) contacts that are solid-state compatible, meaning the low-energy switching circuit (5 V, 1 mA) is rated for one incorrect switching operation per 100 million cycles — critical when the switch feeds a PLC input or a solid-state logic input that cannot tolerate contact oxidation. Rated insulation voltage is 690 V AC at pollution degree 3, with a surge voltage resistance of 6 kV. This positions the switch for 400 V and 690 V industrial control panels where transient overvoltages from motor starts or nearby lightning are common. ## Mounting and Connection — Snap-On Front Fit, Ring Lug Terminals Snap-on mounting to the front of contactors in sizes S00, S0, S2, and S3 — no tools needed for installation, and the switch sits flush against the contactor face, adding 36 mm width and 43.7 mm depth to the assembly. The ring terminal lug connection accepts crimp ring lugs for secure, vibration-resistant wiring in the auxiliary and control circuits. Mechanical service life is 5,000,000 operating cycles typical, matching the endurance of the base contactor in high-cycle applications like conveyor systems or packaging machinery. ## Sourcing and Lifecycle — Current Production, Available to Order The mirror contact feature per IEC 60947-4-1 is present when the switch is used with 3RT2.2/3/4 contactors — this is a safety-relevant attribute for applications requiring welded-contact detection in motor starter circuits.","metaTitle":"Siemens 3RH2911-4NF02 SIRIUS Auxiliary Switch, 2 NC, 690 V","metaDescription":"Siemens 3RH2911-4NF02 SIRIUS auxiliary switch, 2 NC solid-state compatible contacts, 690 V insulation, 5M cycles. Snap-on front mount for S00–S3 contactors.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"43.7 mm","Width":"36 mm","title":"3RH2911-4NF02","Height":"37.5 mm","at 24 V":"0.3 A","at 48 V":"0.3 A","at 60 V":"0.3 A","description":"auxiliary switch, solid-state compatible, on the front, 2 NC,.1/.2, --/--, --/--,.1/.2, current path: 1 NC (solid-state compatible), --, --, 1 NC (solid-state compatible), ring cable lug connection, for contactors 3RT2 and contactor relays 3RH2","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"snap-on mounting","Product Category":"Auxiliary switch","Lagging Switching":"0","Size Of Contactor":"S00, S0, S2, S3","Product Brand Name":"SIRIUS","Product Designation":"auxiliary switch","Suitability For Use":"Contactor relay and power contactor","Design Of The Product":"for snapping onto the front","Instantaneous Contact":"0","Substance Prohibitance (Date)":"10/01/2009","protection class IP on the front":"IP00","Surge Voltage Resistance Rated Value":"6 kV","Contact Reliability Of Auxiliary Contacts":"one incorrect switching operation of 100 million switching operations (5 V, 1 mA)","mirror contact according to IEC 60947-4-1":"Yes; with 3RT2.2/3/4","Mechanical Service Life (Operating Cycles) Typical":"5 000 000","Type Of Electrical Connection For Auxiliary And Control Circuit":"ring terminal lug connection","insulation voltage with degree of pollution 3 at AC rated value":"690 V","number of CO contacts of auxiliary contacts instantaneous contact":"0"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a9c8d0e999557e171e2b4a176a99fe58.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=321459&mlfb=3RH2911-4NF02"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-4NF02","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/3RH2911-4NF02 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}