{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1911-1FA11-ZW98","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1911-1FA11-ZW98","canonicalUrl":"https://aoctrl.com/siemens/3RH1911-1FA11-ZW98","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1FA11-ZW98","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch, 3RH1911-1FA11-ZW98, 1 NO instantaneous contact, size S00, snap-on front mounting for contactor relays and power contactors, IP20 front protection.","salesMarkdown":"It snaps onto the front of a contactor relay or power contactor, adding one normally-open instantaneous contact to the assembly. This is the part you add when the base contactor runs out of auxiliary contacts for your feedback or interlock logic. ## Switching capacity — what the ratings mean This auxiliary switch carries two sets of rated values. The first set (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) reflects the thermal current and switching capability across a range of control voltages — the 6 A at 24 V and 230 V are the peaks, with derating as voltage climbs. The second set (at 24 V: 10 A, at 60 V: 4.7 A, at 110 V: 3 A, at 220 V: 1.2 A, at 440 V: 0.5 A, at 600 V: 0.26 A) is the AC-12 / AC-15 rated operational current for switching resistive and inductive loads. The AC-12 maximum is 10 A. For AC-15 at 690 V it's rated 1 A. So for a 24 VDC PLC output driving a contactor coil, this switch handles the load comfortably; for a 400 VAC motor circuit feedback, it's still good for 3 A. ## Safety feature — mirror contact This auxiliary switch is a mirror contact per IEC 60947-4-1 when paired with a 3RT1 contactor. That means the normally-closed mirror contact cannot close if the main contactor's power contacts are welded shut. It's a safety-relevant feature for feedback circuits in machine guarding or drive safety functions — the NC contact gives a positive indication of the main contact state. Snap-on front mounting onto S00 contactors — no tools needed, clips into the front face. The block measures 36.5 mm wide, 37.5 mm high, 41.5 mm deep. It accepts 2 x (0.5 to 1.5 mm²) solid or stranded, or 2 x (0.75 to 2.5 mm²) with ferrules. For AWG: 2 x (20 to 16) or 2 x (18 to 14). The front is IP20 protected — safe for finger contact inside an enclosure but not for washdown. ## Compliance documentation RoHS compliance date is July 1, 2006, which means it meets the original EU RoHS directive. The product carries the SIRIUS brand designation and is designed for use with Siemens contactor systems. No specific UL or CSA listing is stated in the evidence, but IEC 60947-4-1 mirror contact compliance is confirmed.","metaTitle":"Siemens 3RH1911-1FA11-ZW98 SIRIUS Auxiliary Switch, S00, 1 N","metaDescription":"Siemens 3RH1911-1FA11-ZW98 SIRIUS auxiliary switch for S00 contactors. 1 NO contact, snap-on front mount, IP20. Rated 6 A at 24 V, 10 A AC-12 max. Mirror contact per IEC 60947-4-1.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"41.5 mm","Width":"36.5 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","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"snap-on mounting","Product Category":"Auxiliary switch","Size Of Contactor":"S00","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","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":"1","Substance Prohibitance (Date)":"07/01/2006","protection class IP on the front":"IP20","Surge Voltage Resistance Rated Value":"6 kV","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","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 3RT1","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":"screw-type terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 V","number of CO contacts of auxiliary contacts instantaneous contact":"0","AWG number as coded connectable conductor cross section for auxiliary contacts":"20 ... 14"}},"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=159509&mlfb=3RH1911-1FA11-ZW98","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1FA11-ZW98/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1911-1FA11-ZW98","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/3RH1911-1FA11-ZW98 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}}