{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1131-1BC40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1131-1BC40","canonicalUrl":"https://aoctrl.com/siemens/3RH1131-1BC40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1131-1BC40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, 3RH1131-1BC40, 3 NO contacts, size S00, 45 mm width, 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, IP20 front, screw and snap-on mounting.","salesMarkdown":"The Siemens 3RH1131-1BC40 is a SIRIUS auxiliary contactor with three normally-open (3 NO) instantaneous contacts, sized in the S00 frame. It is designed for control-circuit switching — signalling, interlocking, and logic functions inside a motor control centre or panel — not for direct motor loads. The 45 mm width and screw-and-snap-on mounting let it land on a DIN rail alongside a SIRIUS contactor or as a standalone block. The contact ratings are given by operating voltage because the switching capacity of a control-circuit contact depends on the voltage it interrupts. At 24 V the contacts carry 10 A; at 230 V they carry 6 A; at 400 V they carry 3 A; and at 690 V they carry 1 A. These are the thermal current ratings (Ith) for the respective AC voltages — the actual make/break capacity in a given duty class (AC-15 for solenoid loads, AC-14 for resistive) will be lower. For a 24 VDC control loop the coil holding power is 3.2 W, so the 10 A rating leaves generous headroom for multiple pilot devices. Wire sizes accepted: two conductors of 0.5–1.5 mm², two of 0.75–2.5 mm², or a single 4 mm² — spring-cage or screw terminals depending on variant (this order code uses screw terminals). Shock resistance rated at 10g / 5 ms and 5g / 10 ms. Surge voltage resistance 6 kV. RoHS compliance date 01.07.2006 — the part meets the original RoHS directive.","metaTitle":"Siemens 3RH1131-1BC40 SIRIUS Auxiliary Contactor, 3 NO, S00","metaDescription":"Siemens SIRIUS 3RH1131-1BC40 auxiliary contactor, 3 NO contacts, size S00, 45 mm width, IP20 front. Active production, screw/snap-on mount. Rated 10 A at 24 V, 6 A at 230 V, 3 A at","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":"30 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":"3","For Auxiliary Contacts":"0","Make-Before-Break Switching":"0","Substance Prohibitance (Date)":"01.07.2006 00:00:00","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","reference code acc. to IEC 81346-2":"K","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","operational current at AC-12 maximum":"10 A","with low demand rate acc. to SN 31920":"40 %","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)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Touch Protection Against Electrical Shock":"finger-safe","Of Auxiliary Contacts Instantaneous Contact":"0","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"3","Type Of Voltage Of The Control Supply Voltage":"DC","B10 value with high demand rate acc. to SN 31920":"1 000 000; With 0.3 x Ie","Identification Number And Letter For Switching Elements":"31 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=8721&mlfb=3RH1131-1BC40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1131-1BC40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 3RH1131-1BC40?","answer":"The 3RT1015-1BB42 is a SIRIUS contactor in the same S00 frame size, but it is a main contactor (power switching) with 3 power poles, not an auxiliary contactor. The 3RH1131-1BC40 is specifically an auxiliary contactor with 3 NO control-circuit contacts. They are not form-fit-function substitutes — the 3RT1015-1BB42 has a different coil voltage and contact configuration. For a direct replacement, stick with the 3RH1131 order code."},{"question":"What is the depth of 3RH1131-1BC40?","answer":"72 mm depth, with a width of 45 mm and height of 57.5 mm."},{"question":"What wire sizes does 3RH1131-1BC40 accept?","answer":"Screw terminals accept 2x (0.5–1.5 mm²), 2x (0.75–2.5 mm²), or 2x 4 mm² solid or stranded conductors."},{"question":"Will 3RH1131-1BC40 drop into a panel specified around 3RT1015-1BB42 without rewiring?","answer":"Both parts share the S00 frame size and the same 45 mm width and snap-on DIN rail mounting, so the physical footprint and rail clip are identical. However, the 3RT1015-1BB42 is a power contactor with different terminal layout and coil voltage — the wiring from a power contactor circuit will not match the auxiliary contactor's control-circuit terminals. Panel wiring would need to be re-terminated."},{"question":"What compliance documentation does Siemens provide for 3RH1131-1BC40?","answer":"RoHS compliance dated 01.07.2006. The part carries a reference code per IEC 81346-2 (K for contactor/relay). Surge voltage resistance 6 kV and pollution degree 3 per IEC 60947. IP20 front protection."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1131-1BC40","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/3RH1131-1BC40 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}}