{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-4HA20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-4HA20","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-4HA20","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4HA20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch, front-mounted, 2 NO, ring terminal lug connection, for 3RT2 contactors and 3RH2 contactor relays, 10 A maximum, IP00 front protection.","salesMarkdown":"## Auxiliary switch for 3RT2 and 3RH2 contactors The Siemens 3RH2911-4HA20 is a front-mounted auxiliary switch block for the SIRIUS series, designed to snap onto 3RT2 power contactors and 3RH2 contactor relays. It provides two normally open (NO) instantaneous contacts rated for a maximum of 10 A, with a rated operational current of 10 A at 24 V AC/DC and 6 A at 230 V AC. ## Contact ratings and switching reliability Switching capacity varies by voltage: at 24 V rated value it handles 10 A, at 110 V rated value 3 A, at 220 V rated value 1.2 A, and at 440 V rated value 0.5 A. ## Mounting and connection Snap-on mounting directly onto the contactor or relay body — no DIN rail required for the switch itself. The auxiliary and control circuit connection uses ring terminal lugs, which provide a vibration-resistant termination common in panel builds. Dimensions are 36 mm wide, 37.5 mm high, and 43.7 mm deep. Front protection class is IP00, meaning the switch is intended for installation inside an enclosure that provides the required ingress protection for the application.","metaTitle":"Siemens 3RH2911-4HA20 Auxiliary Switch, 2 NO, 10 A, SIRIUS","metaDescription":"Siemens SIRIUS auxiliary switch for 3RT2/3RH2 contactors. 2 NO, 10 A max, ring terminal lug connection. Snap-on mounting, 43.7 mm depth. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Note":"with 3RH2","Depth":"43.7 mm","Width":"36 mm","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","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","at AC-15 at 690 V rated value":"1 A","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)","Mechanical Service Life (Operating Cycles) Typical":"10 000 000","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"}},"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=5252&mlfb=3RH2911-4HA20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4HA20/alternatives.json"},"ai":{"faq":[{"question":"What is the contact configuration of 3RH2911-4HA20?","answer":"It provides two normally open (NO) instantaneous contacts. There are no leading or lagging switching contacts on this block."},{"question":"What is the maximum current rating for 3RH2911-4HA20?","answer":"The maximum rated current is 10 A. At 24 V rated value it also handles 10 A; at 230 V rated value it handles 6 A."},{"question":"Where can I buy 3RH2911-4HA20?","answer":"This part is sourced 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/3RH2911-4HA20","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/3RH2911-4HA20 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}}