{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-4HA11","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-4HA11","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-4HA11","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4HA11","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 3RH2911-4HA11, 1 NO + 1 NC, front-mount, 10 A, ring cable lug connection, for 3RT2/3RH2.","salesMarkdown":"The Siemens 3RH2911-4HA11 is a front-mounted auxiliary switch block in the SIRIUS family, designed specifically for 3RT2 power contactors and 3RH2 contactor relays. It provides one normally-open and one normally-closed instantaneous contact, wired via ring cable lug terminals. Snap-on mounting onto the contactor or relay front face means no tools or additional hardware are needed for installation — it clips directly into the designated slot on the device. The maximum thermal current is 10 A, but the real-world switching capability depends on voltage and load type. At 24 V it switches 6 A; at 110 V it handles 1 A; at 230 V it manages 6 A; at 400 V it drops to 3 A. These are the AC-15 rated values for inductive loads with solenoids and contactor coils — the most common auxiliary circuit duty. For DC switching at 24 V the contact is rated 10 A, at 60 V it handles 4.7 A, at 110 V it manages 3 A, and at 220 V it drops to 1.2 A. The DC ratings follow the expected curve for breaking a DC inductive load without an arc-suppression network. The insulation voltage is rated 690 V at pollution degree 3, with a surge voltage withstand of 6 kV. The ring cable lug connection is less common than screw-cage terminals on some sibling blocks, so verify your termination preference before committing the BOM line. If your panel standard uses screw terminals, the 3RH2911-4HA11 requires a ring lug crimp tool and appropriate lug size for your wire gauge. At 36 mm wide, 37.5 mm tall, and 43.7 mm deep, this block adds minimal footprint to the contactor or relay it mounts on. The IP00 front protection means it is intended for enclosed panels only — no exposed live parts in the field. Mechanical service life is 10 million switching cycles typical, matching the base contactor or relay it attaches to.","metaTitle":"Siemens 3RH2911-4HA11 SIRIUS Auxiliary Switch, 1 NO + 1 NC,","metaDescription":"Siemens SIRIUS auxiliary switch block 3RH2911-4HA11 with 1 NO + 1 NC contacts, rated 10 A. Snap-on mounting for 3RT2 contactors and 3RH2 contactor relays. Ring cable lug connection","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Note":"with 3RH2","Depth":"43.7 mm","Width":"36 mm","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","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","at AC-15 at 690 V rated value":"1 A","protection class IP on the front":"IP00","Surge Voltage Resistance Rated Value":"6 kV","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":"ring terminal lug connection","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/eafc2574b3b531434be941e8f8018243.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=251045&mlfb=3RH2911-4HA11","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4HA11/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative if I cannot source this exact code?","answer":"The 3RT1015-1BB42 is a SIRIUS power contactor in size S00 that shares the same auxiliary contact ratings (10 A at 24 V, 6 A at 230 V, 3 A at 400 V) and the same contact reliability specification. However, it is a complete contactor with screw terminals, not a front-mount auxiliary block — it replaces the base device, not just the switch block. If you need only the auxiliary block function, verify that the replacement contactor's built-in auxiliary contacts match your circuit count."},{"question":"Will the 3RH2911-4HA11 fit a panel wired for a 3RT1015-1BB42?","answer":"Not directly as a drop-in. The 3RH2911-4HA11 is a front-mounted auxiliary block that clips onto a 3RT2 or 3RH2 base device. The 3RT1015-1BB42 is a complete contactor with its own auxiliary contacts built in. If the panel already has a 3RT1015-1BB42, you would not add this block to it — the contactor's own auxiliary contacts are already present. If the panel uses a different base contactor, the 3RH2911-4HA11 may not be mechanically compatible."},{"question":"What compliance documentation is available for this part?","answer":"The part carries the SIRIUS brand and is designed to IEC/EN 60947-5-1 standards for control circuit devices. Insulation coordination is rated for pollution degree 3 at 690 V with 6 kV surge withstand. Specific RoHS, REACH, and UL file information should be confirmed against the manufacturer's current compliance declarations for the order code."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-4HA11","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/3RH2911-4HA11 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}}