{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-4HA02","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-4HA02","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-4HA02","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-4HA02","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2911-4HA02 auxiliary switch, snap-on mounting for contactor sizes S00, S0, S2, S3, ring terminal lug connection, 10 A AC-12 maximum operational current.","salesMarkdown":"## What the ratings mean for your panel The 3RH2911-4HA02 is a SIRIUS auxiliary switch rated for 10 A maximum at AC-12 duty — that's the resistive load ceiling for the auxiliary contacts, so keep inductive or pilot-duty loads within the AC-15 derating curve (1 A at 690 V). It snaps onto the front of Siemens contactors in sizes S00, S0, S2, and S3 — the same mounting footprint covers the whole SIRIUS block contactor family, so one spare part number supports multiple panel builds. The mirror contact function per IEC 60947-4-1 is present when paired with a 3RT2 contactor — this matters for safety circuits where the NC mirror contact must positively indicate the main contact state, as required in fail-safe drive disconnects. ## Current ratings across the voltage range Rated operational current at 24 V is 6 A (with a separate 10 A rating at 24 V for the alternative duty class), stepping down to 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V and 250 V, and 3 A at 400 V. The alternative rated-value set shows 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, 0.5 A at 440 V, and 0.26 A at 600 V — these are the figures to use when coordinating with the upstream protective device for the specific control voltage on site. Contact reliability is specified at 1 faulty switching per 100 million operations at 17 V, 1 mA — this is the low-level signal threshold; for dry-contact PLC inputs running at 24 V, the reliability margin is well into the safe zone. ## Mechanical life and environmental limits Typical mechanical service life is 10 million operating cycles — this is the unloaded mechanical endurance; actual electrical life depends on the switched current and voltage per the derating curves. Operating temperature range is -25 to +60 °C, with storage from -55 to +80 °C — the switch lives inside the contactor enclosure, so the panel ambient, not the machine-side temperature, governs the derating. IP00 on the front means no ingress protection at the operator face — the auxiliary switch relies on the contactor enclosure or panel door for splash and dust sealing. ## Sourcing and lifecycle status Termination is ring terminal lug connection — confirm the ring tongue size matches your panel wiring before committing the BOM line; the switch does not accept cage-clamp or screw-cage terminals. RoHS compliance date is 10/01/2009 — the switch meets the EU RoHS substance restrictions effective from that date.","metaTitle":"Siemens 3RH2911-4HA02 SIRIUS Auxiliary Switch, 10 A AC-12","metaDescription":"Siemens 3RH2911-4HA02 SIRIUS auxiliary switch, 10 A AC-12 max, snap-on mount for S00-S3 contactors. Current production. Quoted to order against BOM.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"43.7 mm","Width":"36 mm","title":"3RH2911-4HA02","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, 2 NC,.1/.2,.1/.2, --/--, --/--, current path: 1 NC, 1 NC, --, --, 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":"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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/09b56cb92489fc78cf5d1041f3dca7ae.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=285678&mlfb=3RH2911-4HA02"},"ai":{"faq":[{"question":"What contactor sizes does the 3RH2911-4HA02 snap onto?","answer":"It snaps onto the front of Siemens SIRIUS contactors in sizes S00, S0, S2, and S3 — the same mounting adapter covers the full block contactor range."},{"question":"How can I order the 3RH2911-4HA02 or check availability?","answer":"The auxiliary switch is sourced through independent distribution and quoted to order against your BOM — submit an RFQ for current pricing and lead time confirmation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-4HA02","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/3RH2911-4HA02 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}}