{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-2HA12-0KT0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-2HA12-0KT0","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-2HA12-0KT0","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2HA12-0KT0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 1 NO + 2 NC, spring-loaded terminals, rated 10 A at 24 V, for 3RT2 contactors and 3RH2 contactor relays.","salesMarkdown":"The Siemens 3RH2911-2HA12-0KT0 is a front-mounted auxiliary switch block in the SIRIUS family, designed to snap onto 3RT2 power contactors and 3RH2 contactor relays. It carries one normally-open and two normally-closed auxiliary contacts, wired out to terminals 21/22, 31/32, and 43/44 — the fourth position is unpopulated. The spring-loaded terminals accept 2x (0.5 to 2.5 mm²) without ferrule, or 2x (0.5 to 1.5 mm²) with core-end processing, and also take 2x (20 to 14 AWG) stranded. For inductive loads in AC-15 duty, the rated operational current drops to 1 A at 690 V — that's the figure that governs switching of contactor coils and solenoid valves at higher voltages. Mechanical life is 10 million switching cycles typical, so it outlasts most contactor bodies it rides on. Snap-on mounting to the front of the contactor or relay — no tools needed, no DIN rail footprint consumed beyond the base device. The block adds 36 mm width and 47.7 mm depth to the assembly, with a height of 41.5 mm. Surge voltage resistance is rated at 6 kV, and insulation voltage at 690 V AC with pollution degree 3 — standard for industrial control panels.","metaTitle":"Siemens 3RH2911-2HA12-0KT0 SIRIUS Auxiliary Switch, 1NO+2NC,","metaDescription":"Siemens SIRIUS auxiliary switch block for 3RT2 contactors and 3RH2 contactor relays. 1 NO + 2 NC contacts, spring-loaded terminals, rated 10 A at 24 V. Snap-on mounting, IP20 front","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Note":"with 3RH2","Depth":"47.7 mm","Width":"36 mm","Height":"41.5 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","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","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)","Without Core End Processing":"2x (0.5 ... 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 ... 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":"690 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/9297829e4c1c84c49be737ddb4186add.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=878010&mlfb=3RH2911-2HA12-0KT0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2HA12-0KT0/alternatives.json"},"ai":{"faq":[{"question":"What is the contact configuration on this auxiliary switch?","answer":"It provides 1 normally-open and 2 normally-closed contacts, wired to terminals 21/22, 31/32, and 43/44. The fourth contact position is unpopulated."},{"question":"What wire sizes does the spring-loaded terminal accept?","answer":"Without ferrule, it accepts 2x (0.5 to 2.5 mm²) solid or stranded. With core-end processing, 2x (0.5 to 1.5 mm²). AWG equivalent is 2x (20 to 14)."},{"question":"What is the rated operational current for AC-15 duty at 690 V?","answer":"The AC-15 rating at 690 V is 1 A. This is the figure that governs switching of inductive loads like contactor coils at higher voltages."},{"question":"Does this auxiliary switch fit 3RT2 contactors?","answer":"Yes, the order code note confirms it is designed for use with 3RT2 power contactors and 3RH2 contactor relays. It snaps onto the front of those base devices."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-2HA12-0KT0","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/3RH2911-2HA12-0KT0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}