{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-4HA03","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-4HA03","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-4HA03","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4HA03","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch, 3RH2911-4HA03, snap-on front mount for contactor sizes S00, S0, S2, S3, 10 A AC-12, 6 kV surge voltage resistance.","salesMarkdown":"The Siemens 3RH2911-4HA03 is a SIRIUS auxiliary switch designed for snapping onto the front of contactor relays and power contactors in sizes S00, S0, S2, and S3. It provides additional contact sets for status feedback, interlocking, or control logic without expanding the panel footprint — the 36 mm width matches the contactor's own envelope. The switch carries a rated operational current of 10 A at AC-12 (resistive load) and 6 A at 24 V, 230 V for general use. The AC-15 rating at 690 V is 1 A — that is the inductive load capability for solenoid or contactor coils, which is the typical duty for an auxiliary in a motor starter. The mirror contact feature per IEC 60947-4-1 means the normally closed contact cannot be held closed by a welded main contact when used with a 3RT2 contactor, a requirement for safety-related feedback circuits. The 6 kV rated surge voltage resistance ensures the contacts withstand transient overvoltages common in industrial control panels without flashover. ## Mounting and connection Snap-on mounting to the contactor front — no tools needed, aligns with the contactor's own DIN-rail clip. Connection is via ring terminal lugs, which provide a vibration-resistant termination for the auxiliary and control circuits. The IP00 front protection means it is intended for enclosure installation, not open-panel washdown areas.","metaTitle":"Siemens 3RH2911-4HA03 SIRIUS Auxiliary Switch, 10 A AC-12","metaDescription":"Siemens SIRIUS 3RH2911-4HA03 auxiliary switch, snap-on for S00-S3 contactors. 10 A AC-12, 6 kV surge, mirror contact per IEC 60947-4-1. Current production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"43.7 mm","Width":"36 mm","Height":"37.5 mm","at 24 V":"6 A","at 48 V":"2 A","at 60 V":"2 A","at 110 V":"1 A","at 125 V":"0.9 A","at 220 V":"0.3 A","at 230 V":"6 A","at 250 V":"0.3 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","Product Category":"Auxiliary switch","Lagging Switching":"0","Size Of Contactor":"S00, S0, S2, S3","Product Brand Name":"SIRIUS","Product Designation":"auxiliary switch","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","Design Of The Product":"for snapping onto the front","Instantaneous Contact":"0","Substance Prohibitance (Date)":"10/01/2009","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)","mirror contact according to IEC 60947-4-1":"Yes; with 3RT2","operational current at AC-15 at 690 V rated value":"1 A","Mechanical Service Life (Operating Cycles) Typical":"10 000 000","operational current of auxiliary contacts at AC-12 maximum":"10 A","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","number of CO contacts of auxiliary contacts instantaneous contact":"0"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=489379&mlfb=3RH2911-4HA03","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4HA03/alternatives.json"},"ai":{"faq":[{"question":"What contactor sizes does this auxiliary switch fit?","answer":"It snaps onto the front of SIRIUS contactor sizes S00, S0, S2, and S3 — covering the most common motor starter frames up to about 40–65 A motor full-load current depending on voltage."},{"question":"Does the 3RH2911-4HA03 provide mirror contacts for safety circuits?","answer":"Yes, it is listed as a mirror contact per IEC 60947-4-1 when used with a 3RT2 contactor. This means the NC contact mechanically reflects the state of the main contacts, a requirement for feedback in safety-related applications."},{"question":"What is the mechanical service life?","answer":"Typical mechanical service life is 10,000,000 operating cycles — suitable for high-duty-cycle applications like conveyor or pump control."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-4HA03","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/3RH2911-4HA03 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}}