{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-1GA04-ZW97","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-1GA04-ZW97","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-1GA04-ZW97","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-1GA04-ZW97","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2911-1GA04-ZW97 contactor relay, auxiliary switch block, 4 NC contacts, screw-type terminals, 10 A maximum, snap-on DIN rail mounting, IP20 front protection.","salesMarkdown":"## What the 4 NC contacts mean for your control circuit The 3RH2911-1GA04-ZW97: This is a front-mounted auxiliary switch block for Siemens SIRIUS contactor relays — specifically the 3RH2140 and 3RH2440 frames (EN 50011 keyed). It carries four normally-closed contacts, wired as 51/52, 61/62, 71/72, 81/82, with screw-type terminals. The NC configuration means the contacts are closed when the relay coil is de-energized — useful for safety interlock circuits, status feedback on a dropped-out contactor, or anti-tie-down logic where the closed state must be verified before a start sequence. Rated 10 A maximum, but the real switching capacity depends on the voltage and duty: at 24 V AC-15 it handles 10 A, at 110 V it drops to 3 A, and at 440 V it's 0.5 A. The 690 V AC-15 rating is 1 A — that's the ceiling for inductive pilot-duty loads at high voltage. ## Snap-on DIN rail fit and panel space Snap-on mounting to standard DIN rail — no screws needed. The block is 36 mm wide, 43.7 mm deep, 37.5 mm high, so it takes up one standard 36 mm module slot on the rail. Terminal capacity is 2x (0.5...1.5 mm²) and 2x (0.75...2.5 mm²) per clamp, or 2x (20...16) and 2x (18...14) AWG. The screw terminals are open-front — a Pozidriv #1 driver reaches them without removing the block. IP20 on the front means finger-safe from the panel face; the rear is open to the DIN rail cavity. No washdown rating — keep it inside a closed enclosure. ## Lifecycle and sourcing — active, but multi-unit packaging Mechanical service life is 10 million switching cycles typical. Contact reliability is 1 faulty switching per 100 million operations at 17 V, 1 mA — that's the low-energy threshold where oxide films on silver contacts can cause intermittents. Quoted to order against your BOM quantity. Availability and current pricing confirmed at RFQ time — the spread is in the volume break, not the unit price.","metaTitle":"Siemens 3RH2911-1GA04-ZW97 Contactor Relay, 4 NC, 10 A","metaDescription":"Siemens 3RH2911-1GA04-ZW97 SIRIUS contactor relay. 4 NC auxiliary contacts, screw terminals, 10 A max, snap-on DIN rail. Active production. Quoted to order.","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":"3RH2911-1GA04-ZW97","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, 4 NC, 51/52, 61/62, 71/72, 81/82, current path: 1 NC, 1 NC, 1 NC, 1 NC, screw terminal, physically coded, only with contactor relays 3RH2140 and 3RH2440 combinable (according to EN 50011), multi-unit packaging, pack = 120 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","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), 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/745b007446d09359747ea8c37d577169.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=774108&mlfb=3RH2911-1GA04-ZW97"},"ai":{"faq":[{"question":"What does the 'with 3RH2' note mean on this part?","answer":"It means the auxiliary switch block is physically coded to fit only Siemens 3RH2140 and 3RH2440 contactor relays per EN 50011. It will not snap onto a standard 3RT2 contactor — the keying prevents mismounting."},{"question":"What are the AC-15 current ratings at common control voltages?","answer":"At 24 V it's 10 A; at 110 V it's 3 A; at 220 V it's 1.2 A; at 440 V it's 0.5 A; at 600 V it's 0.26 A. The 690 V AC-15 rating is 1 A. These are the inductive pilot-duty limits — resistive loads can run higher per the DC ratings."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-1GA04-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/3RH2911-1GA04-ZW97 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}}