{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1422-1BF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1422-1BF40","canonicalUrl":"https://aoctrl.com/siemens/3RH1422-1BF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1422-1BF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH1422-1BF40 auxiliary contactor, size S00, 110 V DC coil, 10 A AC-12 rated, 2 instantaneous N/O contacts, screw and snap-on mounting, IP20 front.","salesMarkdown":"## SIRIUS S00 auxiliary contactor — 110 V DC coil, 10 A switching The 3RH1422-1BF40 is a Siemens SIRIUS auxiliary contactor in frame size S00, designed for control-circuit switching in motor starter and relay logic panels. The 10 A AC-12 rating is the ceiling for general-purpose control loads; the 690 V figure shows it handles high-voltage signal isolation without derating to zero. Two instantaneous N/O contacts (no delayed or lagging switching) with a contact reliability of one incorrect operation per 100 million cycles at 17 V, 1 mA — this matters when switching low-level PLC inputs or dry-contact signals where oxide films on standard contacts cause intermittent opens. ## Panel fit — 72 mm depth, screw or snap-on DIN rail The dual-conductor terminals allow daisy-chaining control power without extra junction blocks — useful when feeding multiple auxiliary contactors from one 110 V DC rail. Shock rated 10g at 5 ms and 5g at 10 ms — sufficient for industrial panel mounting on machine frames or conveyor sections, but not for direct engine-mount applications without additional damping. ## Lifecycle and compliance — active, RoHS, 6 kV surge Rated surge voltage resistance 6 kV, pollution degree 3, which means it's designed for industrial environments where transient overvoltages from motor switching or nearby lightning are expected — no external MOV needed for basic insulation coordination. RoHS compliance date 07/01/2006, so it meets EU substance restrictions for current installations. The product extension auxiliary switch is available — meaning the contactor accepts add-on auxiliary contact blocks for field expansion without replacing the base unit. This is standard for the SIRIUS S00 platform but worth confirming if your BOM calls for more than the two built-in N/O contacts.","metaTitle":"Siemens 3RH1422-1BF40 SIRIUS Auxiliary Contactor, 110 V Coil","metaDescription":"Siemens 3RH1422-1BF40 SIRIUS auxiliary contactor, size S00, 110 V DC coil, 10 A AC-12 rated, 2 N/O contacts. IP20 front, DIN rail or screw mount.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"72 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Width":"90 mm","title":"3RH1422-1BF40","Height":"57.5 mm","Rated Value":"110 V","description":"Contactor relay latched, 4-pole 2 NO + 2 NC Size S00 110 V DC!!! Phased-out product!!! Successor is SIRIUS 3RH2 Preferred successor type is >>3RH2422-1BF40<<","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-55 ... +80 °C","Fastening Method":"screw and snap-on mounting","Full-Scale Value":"1.1","Shock Resistance":"10g / 5 ms and 5g / 10 ms","Delayed Switching":"0","Lagging Switching":"0","Mounting Position":"+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface","Size Of Contactor":"S00","Product Brand Name":"SIRIUS","Contact Reliability":"one incorrect switching operation of 100 million switching operations (17 V, 1 mA)","Degree Of Pollution":"3","Product Designation":"Auxiliary contactor","at 24 V rated value":"10 A","Of Contactor Typical":"5 000 000","at 110 V rated value":"1 A","at 220 V rated value":"0.27 A","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 500 V rated value":"2 A","at 690 V rated value":"1 A","Instantaneous Contact":"2","For Auxiliary Contacts":"0","Make-Before-Break Switching":"0","Substance Prohibitance (Date)":"07/01/2006","protection class IP on the front":"IP20","Product Extension Auxiliary Switch":"Yes","closing power of magnet coil at DC":"3.2 W","holding power of magnet coil at DC":"3.2 W","Surge Voltage Resistance Rated Value":"6 kV","operational current at AC-12 maximum":"10 A","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","reference code according to IEC 81346-2":"K","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)","Touch Protection Against Electrical Shock":"finger-safe","with low demand rate according to SN 31920":"40 %","Of Auxiliary Contacts Instantaneous Contact":"0","with high demand rate according to SN 31920":"75 %","number of NC contacts for auxiliary contacts":"2","number of NO contacts for auxiliary contacts":"2","Type Of Voltage Of The Control Supply Voltage":"DC","Identification Number And Letter For Switching Elements":"22 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Required Spacing With Side-By-Side Mounting At The Side":"0 mm","Of The Contactor With Added Auxiliary Switch Block Typical":"5 000 000","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","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000","Design Of The Fuse Link For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/c5aa7e4054255eb470c6dc2c9a1ac121.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=404407&mlfb=3RH1422-1BF40"},"ai":{"faq":[{"question":"What is the 3RH1422-1BF40 used for?","answer":"It is an auxiliary contactor for control-circuit switching in motor starter panels, relay logic, and PLC output isolation. The 110 V DC coil and 10 A AC-12 contacts suit it for switching solenoid valves, signal lamps, and small contactor coils within a control cabinet."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1422-1BF40","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/3RH1422-1BF40 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}}