{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-2XA40-0MA0-ZW97","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-2XA40-0MA0-ZW97","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-2XA40-0MA0-ZW97","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2XA40-0MA0-ZW97","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 4 NO, spring-loaded terminals, snap-on mounting, for 3RT2 contactors and 3RH2 contactor relays, 10 A max, IP20.","salesMarkdown":"The Siemens SIRIUS 3RH2911-2XA40-0MA0-ZW97 is a front-mount auxiliary switch block designed for the 3RT2 power contactor and 3RH2 contactor relay families. It provides four normally-open (4 NO) auxiliary contacts in a single 36 mm wide housing that snaps onto the front of the base device — no extra DIN rail space required. The spring-loaded terminals accept 2x (0.5...1.5 mm²) with ferrule or 2x (0.5...2.5 mm²) solid, and the IP20 front protection means it lives inside the panel, not on the machine face. The contact arrangement is four independent NO paths (53/54, 63/64, 73/74, 83/84), each rated for 10 A maximum. That 10 A figure is the thermal current rating — what the contacts can carry continuously in free air. The real switching capacity depends on voltage and load type: at 24 V it switches 6 A (AC-15), at 230 V it still handles 6 A, and at 400 V it drops to 3 A. For DC loads, the ratings are lower — 10 A at 24 V, 4.7 A at 60 V, 0.5 A at 440 V — reflecting the harder arc extinction on DC. The AC-15 rating at 690 V (1 A) tells you this block is certified for electromagnetic load switching — contactor coils, solenoid valves, small transformers — at the higher end of the voltage range. The 6 kV surge voltage resistance means it can handle the transient spikes common on 400 V industrial networks without welding or degrading the contacts. Insulation is rated for 690 V AC at pollution degree 3, which covers most factory-floor environments where conductive dust or humidity is present. That matters when you're using these contacts to switch PLC inputs or low-voltage sensor signals — dry-switching conditions where oxide films on standard contacts can cause intermittent failures. The SIRIUS block is designed for that regime, so it won't ghost-fault on a 24 VDC input card. That's the mechanism, not the electrical endurance — actual contact life under load will be lower depending on switching frequency and inrush current, but the base mechanical figure gives you a floor for preventive replacement intervals on high-cycle applications like conveyor interlocks or press controls. Snap-on mounting to the front of the 3RT2 or 3RH2 base device — no tools needed, no DIN rail consumed. The block adds 47.7 mm depth and 36 mm width to the assembly, with a height of 41.5 mm. Spring-loaded terminals: strip 8 mm, push the orange actuator, insert the wire, release. Accepts 2x (0.5...1.5 mm²) with ferrule or 2x (0.5...2.5 mm²) solid, or 2x (20...14 AWG). The leading and lagging contact timing is zero — all four NO contacts close and open simultaneously, so no sequencing between them.","metaTitle":"Siemens 3RH2911-2XA40-0MA0-ZW97 SIRIUS Auxiliary Switch, 4 N","metaDescription":"Siemens SIRIUS auxiliary switch block 3RH2911-2XA40-0MA0-ZW97, 4 NO contacts, spring-loaded terminals, snap-on for 3RT2/3RH2, IP20, 690 V insulation, 10 A max. Current lifecycle st","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":"4","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 (Operating 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/d50cfc86b6e1ae536d8006c567b73859.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=249779&mlfb=3RH2911-2XA40-0MA0-ZW97","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2XA40-0MA0-ZW97/alternatives.json"},"ai":{"faq":[{"question":"What does the note 'with 3RH2' mean?","answer":"The note indicates this auxiliary switch block is designed to mount on the front of Siemens 3RH2 contactor relays (and 3RT2 power contactors). It is not a standalone device — it requires a base contactor or relay to snap onto."},{"question":"What is the depth of this auxiliary switch block?","answer":"The depth is 47.7 mm, measured from the front face of the base contactor or relay it mounts on."},{"question":"What compliance documentation does this part carry?","answer":"The evidence does not list specific compliance marks (UL, CSA, CE, RoHS, REACH) for this order code. Standard Siemens SIRIUS components typically carry CE and UL/CSA certifications, but confirm the specific documentation for your jurisdiction with your Siemens channel partner."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-2XA40-0MA0-ZW97","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/3RH2911-2XA40-0MA0-ZW97 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}}