{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-1LA20-ZW98","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-1LA20-ZW98","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-1LA20-ZW98","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-1LA20-ZW98","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2911-1LA20-ZW98 auxiliary switch, front-mounted, 2 NO contacts, 10 A maximum, screw-type terminals, snap-on mounting for 3RT2 contactors and 3RH2 contactor relays.","salesMarkdown":"## What this front-mounted auxiliary switch does The 3RH2911-1LA20-ZW98 is a SIRIUS auxiliary switch block that snaps onto the front of Siemens 3RT2 contactors and 3RH2 contactor relays, adding two normally-open signal contacts (73/74, 83/84) for feedback or interlocking. Rated 10 A maximum, with AC-15 current ratings that drop as voltage rises: 6 A at 24 V, 3 A at 110 V, 1.2 A at 220 V, and 0.5 A at 440 V — the 690 V AC-15 rating is 1 A, which governs the contact life in high-voltage control circuits. Contact reliability is specified at one faulty switching per 100 million operations at 17 V, 1 mA — that covers dry-contact PLC inputs where the load current is well below the rated thermal current. ## Snap-on fit and wiring for panel integration Snap-on mounting to the contactor front face — no DIN-rail slot consumed. Dimensions are 36 mm wide, 37.5 mm tall, 43.7 mm deep, which keeps the assembly within the contactor envelope. Screw-type terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) per clamp, or 2x (20 to 16 AWG) and 2x (18 to 14 AWG). Cable entry from the top — plan wire routing above the contactor. IP20 on the front face means finger-safe in the enclosure but not washdown-rated. Rated insulation voltage is 690 V AC at pollution degree 3, with a 6 kV surge voltage resistance — suitable for 400 V line-to-line control panels with adequate clearance. ## Sourcing and lifecycle for this SIRIUS auxiliary No direct second-source cross-reference — the 3RH2 family is Siemens-specific for the 3RT2 contactor platform. Mechanical service life is 10 million switching cycles typical — that's a long-term spare for a contactor that cycles infrequently (valve control, conveyor interlock). The 2 NO contacts are independent; leading and lagging contact timing is not specified (both marked 0), so they switch simultaneously.","metaTitle":"Siemens 3RH2911-1LA20-ZW98 Auxiliary Switch, 2 NO, 10 A","metaDescription":"Siemens 3RH2911-1LA20-ZW98 SIRIUS auxiliary switch, 2 NO contacts, rated 10 A max. Screw terminals, snap-on mounting for 3RT2/3RH2 contactors.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Note":"with 3RH2","Depth":"43.7 mm","Width":"36 mm","title":"3RH2911-1LA20-ZW98","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","description":"auxiliary switch, on the front, 2 NO, 73/74, 83/84, current path: 1 NO, 1 NO, cable entry from the top, screw terminal, for contactors 3RT2 and contactor relays 3RH2, multi-unit packaging, pack = 60 units","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":"2","With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 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 ... 16), 2x (18 ... 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":"screw-type terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/408dc7cf0af33be26d46923723542afd.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=52326&mlfb=3RH2911-1LA20-ZW98"},"ai":{"faq":[{"question":"What is the 3RH2911-1LA20-ZW98 rated for at 690 V AC?","answer":"In AC-15 duty at 690 V, the rated operational current is 1 A. This is the limiting factor for high-voltage control circuits — the contact can switch a 690 V pilot load but at a lower current than the 10 A maximum thermal rating."},{"question":"Will this auxiliary switch fit a 3RT2 contactor?","answer":"Yes, the 3RH2911-1LA20-ZW98 is designed for snap-on mounting to the front of 3RT2 contactors and 3RH2 contactor relays. It adds two NO contacts without increasing the DIN-rail footprint."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-1LA20-ZW98","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/3RH2911-1LA20-ZW98 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}