{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1140-1BB40-ZW97","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1140-1BB40-ZW97","canonicalUrl":"https://aoctrl.com/siemens/3RH1140-1BB40-ZW97","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1140-1BB40-ZW97","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 4 NO instantaneous contacts, 24 V DC coil, screw and snap-on mounting, IP20 front.","salesMarkdown":"It's the part you grab when the control circuit needs to mirror a main contactor's state or add extra signal paths without pulling another power contactor into the panel. Coil is 24 V DC, pulling 3.2 W to close and the same 3.2 W to hold — no inrush spike to size your DC supply around. That's a straight number for the panel power budget. Rated operational current hits 10 A in AC-12 duty (resistive loads at line frequency), so it handles pilot-duty signalling, PLC outputs, and contactor coils within that envelope. At 230 V AC it's rated 6 A; at 400 V AC it drops to 3 A — the derating curve matters if you're switching a bank of contactor coils on a 400 V control transformer. Front protection is IP20 — fine inside a closed cabinet, but keep it behind a panel door if there's any washdown or dust in the room. Terminal capacity accepts solid conductors: 2x 0.5 to 1.5 mm², 2x 0.75 to 2.5 mm², or a single 4 mm². That covers most control wiring gauges you'll pull in a panel — no need for ferrule adapters on standard 1.5 mm² or 2.5 mm² runs. Shock resistance is 10g for 5 ms and 5g for 10 ms, which covers most industrial vibration profiles without contact bounce. Depth is 72 mm, height 57.5 mm — fits standard S00 enclosure cutouts. RoHS compliance date is 07/01/2006, so it meets the EU substance restrictions. The part carries the SIRIUS brand from Siemens, which means the usual CE, UL, CSA, and IEC certifications apply to the series — the specific approvals for this variant are listed on the nameplate and in the manufacturer's declaration. That's a wide enough thermal envelope for unheated warehouses and shipping containers.","metaTitle":"Siemens 3RH1140-1BB40-ZW97 SIRIUS Auxiliary Contactor, 24 V","metaDescription":"Siemens SIRIUS 3RH1140-1BB40-ZW97 auxiliary contactor, size S00, 24 V DC coil, 4 NO contacts, 10 A AC-12 rated, screw/snap-on mount, IP20. Current production.","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":"45 mm","Height":"57.5 mm","Rated Value":"24 V","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":"30 000 000","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":"4","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":"0","number of NO contacts for auxiliary contacts":"4","Type Of Voltage Of The Control Supply Voltage":"DC","Identification Number And Letter For Switching Elements":"40 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":"10 000 000","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,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=306273&mlfb=3RH1140-1BB40-ZW97","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1140-1BB40-ZW97/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this auxiliary contactor?","answer":"24 V DC coil drawing 3.2 W, 4 NO instantaneous contacts, rated 10 A at AC-12 (resistive), 6 A at 230 V AC, 3 A at 400 V AC. Mechanical life is 30 million operations. Surge voltage resistance is 6 kV. Mounts on DIN rail, size S00 frame, 45 mm wide."},{"question":"Will 3RH1140-1BB40-ZW97 drop into a panel specified around 3RT1015-1BB42?","answer":"Both are size S00 frame contactors from the Siemens SIRIUS family, so the physical footprint and DIN-rail clip pattern are the same. The 3RH1140 is an auxiliary contactor (4 NO, no main power contacts), while the 3RT1015 is a power contactor. They share the same mounting dimensions and terminal spacing, so no rewiring of the DIN-rail layout is needed — just swap the function. The 3RH1140-1BB40-ZW97 has a 24 V DC coil; verify the 3RT1015-1BB42 coil voltage matches your control circuit."},{"question":"What compliance documentation is available for this part?","answer":"RoHS compliance date is 07/01/2006. The SIRIUS series carries CE, UL, CSA, and IEC certifications per Siemens standard declarations. The specific approvals are printed on the nameplate; the manufacturer provides a declaration of conformity for the series."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1140-1BB40-ZW97","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/3RH1140-1BB40-ZW97 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}}