{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1140-1BN40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1140-1BN40","canonicalUrl":"https://aoctrl.com/siemens/3RH1140-1BN40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1140-1BN40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, auxiliary contactor, 4 NO, Size S00, screw and snap-on mounting, 45 mm width, 10 A AC-12 rated operational current.","salesMarkdown":"The Siemens 3RH1140-1BN40 is a SIRIUS auxiliary contactor in Size S00, carrying four normally-open (4 NO) instantaneous contacts. It is designed to switch control circuits — pilot devices, PLC inputs, contactor coils — not motor loads directly. The headline rating is 10 A at AC-12 (resistive loads and solid-state outputs) per IEC 60947-5-1. That 10 A holds at 24 V and 400 V, but drops to 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V — the switching capacity follows the voltage curve. For a controls integrator, the AC-12 rating means this contactor is sized for control-circuit duty, not motor switching. The 4 NO configuration gives you four independent signal paths; there are no NC, delayed, or make-before-break contacts on this variant. Ambient range is -25 to +60 °C operating, -55 to +80 °C storage, with a 2000 m altitude limit. At 45 mm wide, 57.5 mm tall, and 72 mm deep, this contactor occupies one standard 45 mm DIN-rail module. Zero clearance required at the sides for heat dissipation — the 0 mm side spacing lets you pack units tight. The screw terminals accept up to 4 mm², which covers most control-circuit wiring in 600 V panels. For a panel OEM wireman, the spring-cage variant (3RH2140-1BP40) is faster for high-volume builds, but the screw terminal on this part is field-serviceable with a standard PZ1 bit.","metaTitle":"Siemens 3RH1140-1BN40 SIRIUS Auxiliary Contactor, 4 NO, Size","metaDescription":"Siemens SIRIUS 3RH1140-1BN40 auxiliary contactor, 4 NO contacts, Size S00, screw/snap-on mount, 45 mm wide. Rated 10 A AC-12 at 400 V. Current production. Available to order.","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","Maximum":"2 000 m","At The Side":"0 mm","Rated Value":"250 V","On The Front":"IP20","Initial Value":"0.8","Mounting type":"screw and snap-on mounting","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","Auxiliary switch":"Yes","During Operation":"-25 ... +60 °C","During Transport":"-55 ... +80 °C","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","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","Closing power of magnet coil at DC":"3.2 W","Holding power of magnet coil at DC":"3.2 W","Operating current at AC-12 maximum":"10 A","Surge voltage resistance rated value":"6 kV","Reference code acc. to DIN EN 61346-2":"K","Reference code acc. to DIN EN 81346-2":"K","with low demand rate acc. to SN 31920":"40 %","With Degree Of Pollution 3 Rated Value":"690 V","with high demand rate acc. to SN 31920":"75 %","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","at AWG conductors for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","Contact reliability of auxiliary contacts":"1 faulty switching per 100 million (17 V, 1 mA)","For Auxiliary And Control Current Circuit":"screw-type terminals","Of Auxiliary Contacts Instantaneous Contact":"0","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","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","Of The Contactor With Added Electronics-Compatible Auxiliary Switch Block Typical":"5 000 000"}},"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=230700&mlfb=3RH1140-1BN40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1140-1BN40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 3RH1140-1BN40?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the closest functional second-source for the 3RH1140-1BN40?","answer":"The 3RH2140-1BP40 is the closest peer — same 4 NO contacts, same Size S00 frame, same footprint. The difference is terminal type: the 3RH1140-1BN40 uses screw terminals, the 3RH2140-1BP40 uses cage-clamp. It will drop into a panel specified around the 3RH2140-1BP40 without rewiring."},{"question":"What is the depth of the 3RH1140-1BN40?","answer":"The depth is 72 mm. Combined with the 45 mm width and 57.5 mm height, it fits standard 45 mm DIN-rail modules with zero side clearance required."},{"question":"What wire sizes does the 3RH1140-1BN40 accept?","answer":"The screw terminals accept 2x (0.5...1.5 mm²), 2x (0.75...2.5 mm²), or 2x 4 mm² solid or stranded conductors."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1140-1BN40","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/3RH1140-1BN40 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}}