{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-4HA30","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-4HA30","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-4HA30","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4HA30","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2911-4HA30 auxiliary switch, 3 NO + 0 NC, snap-on front mounting for contactor sizes S00, S0, S2, S3, ring terminal lug connection, 10 A AC-12, IP00 front.","salesMarkdown":"## What the AC-15 and AC-12 ratings mean for your control circuit The 3RH2911-4HA30: This auxiliary switch block carries two distinct current ratings depending on the load type. The AC-15 values govern the real-world switching of contactor coils and solenoids — the inrush current can be 5–10× the sealed current, and the contact must weld-free through that. The AC-12 rating is the thermal continuous current ceiling; use it for sizing the contact for purely resistive loads. ## Mounting and contact configuration The 3RH2911-4HA30 snaps onto the front of Siemens SIRIUS contactors in frame sizes S00, S0, S2, and S3 — no tools needed for attachment. It provides 3 normally-open instantaneous contacts and 0 normally-closed contacts, with a leading contact count of 0 and lagging switching count of 0. The auxiliary and control circuit connection uses ring terminal lugs, which give a vibration-resistant termination compared to spring-cage or screw-clamp on smaller contactors. The block measures 36 mm wide, 37.5 mm high, and 43.7 mm deep — the depth is the dimension that projects forward from the contactor face, so check clearance to the enclosure door or adjacent devices. The front face is rated IP00 (no protection against dust or water ingress), so the switch block must be mounted inside a closed panel or enclosure. Surge voltage resistance is 6 kV, and the mirror contact function per IEC 60947-4-1 is achieved when used with the 3RT2 contactor — this is relevant for safety-related feedback circuits where the N/C mirror contact must positively indicate the main contact position.","metaTitle":"Siemens 3RH2911-4HA30 SIRIUS Auxiliary Switch, 10 A AC-12","metaDescription":"Siemens 3RH2911-4HA30 SIRIUS auxiliary switch, 10 A AC-12 rated current, 3 NO contacts, snap-on mounting for S00-S3 contactors. Current production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"43.7 mm","Width":"36 mm","title":"3RH2911-4HA30","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","description":"auxiliary switch, on the front, 3 NO,.3/.4,.3/.4,.3/.4, --/--, current path: 1 NO, 1 NO, 1 NO, --, ring cable lug connection, for contactors 3RT2 and contactor relays 3RH2","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":"3","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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/47052bd9f78d66f8e157c6c5e10bb99c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=493567&mlfb=3RH2911-4HA30"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RH2911-4HA30?","answer":"Submit an RFQ for your target quantity; current pricing and lead time are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-4HA30","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/3RH2911-4HA30 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}