{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-2HA03","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-2HA03","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-2HA03","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2HA03","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block 3RH2911-2HA03, 3 NC contacts, spring-loaded terminals, snap-on mounting for 3RT2 contactors and 3RH2 contactor relays, rated 10 A maximum.","salesMarkdown":"## What this block does in the panel The Siemens 3RH2911-2HA03 is a SIRIUS auxiliary switch block that snaps onto the front of 3RT2 contactors and 3RH2 contactor relays, adding three normally-closed (NC) signal paths to the switching assembly. Each of the three NC current paths is rated for a maximum of 10 A, with specific switching capacities at different control voltages: 6 A at 24 V AC/DC and 230 V, 3 A at 400 V, and 1 A at 110 V — so it handles both low-voltage PLC outputs and higher-voltage motor-control circuits in the same block. The spring-loaded terminals accept 2x (0.5 to 2.5 mm²) stranded without ferrules, or 2x (0.5 to 1.5 mm²) with ferrules — no screwdriver torque check needed, which saves time when you're wiring a row of these on a DIN rail in a crusher panel. Snap-on mounting means it clips directly onto the contactor front without tools; the 36 mm width matches the standard contactor footprint, so it doesn't eat extra rail space. ## Rated for the environment it lives in Insulation voltage is rated 690 V at pollution degree 3, and surge voltage resistance is 6 kV — that's coordination for industrial environments where motor starts and contactor dropout create transients. Mechanical service life is 10 million switching cycles typical, and contact reliability is 1 faulty switching per 100 million operations at 17 V, 1 mA — the block is rated for the long haul on a conveyor or pump starter that cycles daily. ## Wiring and fit notes The block has no leading, lagging, or instantaneous contact timing options — all three NC contacts switch simultaneously when the contactor armature moves. AWG range for the spring terminals is 2x (20 to 14) — standard control wiring sizes are covered without pigtail adapters. Depth is 47.7 mm, height 41.5 mm, width 36 mm.","metaTitle":"Siemens 3RH2911-2HA03 SIRIUS Auxiliary Switch, 3 NC, 10 A, S","metaDescription":"Siemens 3RH2911-2HA03 SIRIUS auxiliary switch block, 3 NC contacts, rated 10 A maximum. Spring-loaded terminals, snap-on mount for 3RT2/3RH2 contactors. IP20 front. Current lifecyc","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","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":"0","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/710f7cfd9a5b578f877584ab8bbb2425.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=360012&mlfb=3RH2911-2HA03","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2HA03/alternatives.json"},"ai":{"faq":[{"question":"What is 3RH2911-2HA03's listed note (with 3RH2) on this component line?","answer":"The note states 'with 3RH2', meaning this auxiliary switch block is designed to mount on Siemens 3RH2 contactor relays (and 3RT2 contactors per the description)."},{"question":"What is the depth of 3RH2911-2HA03?","answer":"The depth is 47.7 mm, with a width of 36 mm and height of 41.5 mm."},{"question":"Will 3RH2911-2HA03 drop into a panel specified around a different contactor auxiliary block?","answer":"The 3RH2911-2HA03 is designed specifically for snap-on mounting on Siemens 3RT2 contactors and 3RH2 contactor relays. It will not mechanically fit other contactor brands or series without adapter hardware."},{"question":"What compliance documentation does this brand provide for 3RH2911-2HA03?","answer":"As a Siemens SIRIUS component, the 3RH2911-2HA03 carries IEC/EN 60947-5-1 compliance for auxiliary contact blocks; specific RoHS, REACH, and UL documentation is available from the manufacturer upon request."},{"question":"Where can I buy 3RH2911-2HA03?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-2HA03","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/3RH2911-2HA03 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}}