{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-2NF02","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-2NF02","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-2NF02","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2NF02","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 2 NC (solid-state compatible), spring-loaded terminals, front mount, 36 mm wide, IP20, for 3RT2 contactors and 3RH2 contactor relays.","salesMarkdown":"The Siemens 3RH2911-2NF02 is a front-mounted auxiliary switch block for the SIRIUS 3RT2 contactor and 3RH2 contactor relay family. It provides two normally-closed (NC) contacts, both rated for solid-state compatibility — meaning the contacts are designed for low-energy switching where oxide film on standard silver contacts can cause intermittent opens. The spring-loaded terminals accept 2x (0.5... 1.5 mm²) with ferrule or 2x (0.5... 2.5 mm²) solid, which matches the typical control-circuit wiring in a panel. Rated insulation voltage is 690 V at pollution degree 3, and surge voltage resistance is 6 kV, so it fits into 400/480 VAC control circuits without derating concerns. The 'solid-state compatible' designation is the defining feature here. Standard auxiliary contacts rely on a minimum wetting current to punch through silver-oxide film — typically around 10-20 mA at 5-10 V. The 3RH2911-2NF02 is specified for one incorrect switching operation per 100 million operations at 5 V, 1 mA, which is two orders of magnitude lower than standard contacts. If your PLC input card or solid-state relay expects a dry signal at milliamps, this block prevents false opens. The two NC contacts are arranged as two separate current paths — labeled.1/.2 and.1/.2 in the description — so you can wire one to the safety circuit and one to the PLC feedback without sharing a common terminal. ## Panel-fit notes The block is 36 mm wide, 41.5 mm high, and 47.7 mm deep — front-mounted so it clips onto the contactor without adding depth behind the panel. Protection class IP20 on the front means it is finger-safe once installed; no additional cover required in a standard IP54 enclosure. The spring-loaded terminals release with a screwdriver push, which speeds up wiring changes during commissioning.","metaTitle":"Siemens 3RH2911-2NF02 Auxiliary Switch, 2 NC, Spring Termina","metaDescription":"Siemens SIRIUS 3RH2911-2NF02 auxiliary switch with 2 NC contacts, solid-state compatible, spring-loaded terminals, IP20, for 3RT2 contactors. Active lifecycle.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Note":"with 3RT2.2/3/4","Depth":"47.7 mm","Width":"36 mm","title":"3RH2911-2NF02","Height":"41.5 mm","at 24 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), spring-loaded terminal, 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","Lagging Switching":"0","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":"one incorrect switching operation of 100 million switching operations (5 V, 1 mA)","Mechanical Service Life (Operating Cycles) Typical":"5 000 000","Type Of Electrical Connection For Auxiliary And Control Circuit":"spring-loaded terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$101.05","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/280101decd1f3023b627413693de20be.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=184686&mlfb=3RH2911-2NF02"},"ai":{"faq":[{"question":"What does the 'solid-state compatible' rating mean?","answer":"It means the contacts are engineered for reliable switching at very low voltage and current — specified at 5 V, 1 mA with only one incorrect operation per 100 million cycles. This avoids the oxide-film problem that causes standard contacts to intermittently fail when driving PLC inputs or solid-state relays."},{"question":"What contactors does this auxiliary switch fit?","answer":"It is designed for the SIRIUS 3RT2 contactor series (frames 2, 3, and 4) and the 3RH2 contactor relay series, per the product note. It mounts on the front of the contactor."},{"question":"What is the terminal type and wire range?","answer":"Spring-loaded terminals accept 2x (0.5... 1.5 mm²) with ferrule or 2x (0.5... 2.5 mm²) solid, and 2x (20... 14 AWG) for auxiliary contacts."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-2NF02","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/3RH2911-2NF02 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}}