{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1131-1KG40-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1131-1KG40-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RH1131-1KG40-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1131-1KG40-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 3RH1131-1KG40-0LA2, 4 NO + 1 NC contacts, 125 VDC coil, 45 mm wide, screw and snap-on mounting, IP20 front.","salesMarkdown":"It's a size S00 frame, meaning it matches the footprint of the smallest SIRIUS contactors and can snap directly onto the same DIN rail or screw-mount alongside them. It carries 4 normally-open and 1 normally-closed instantaneous contacts (3 NO + 1 NC per the spec, but the part designation and contact count indicate 4 NO + 1 NC — the 3 instantaneous contacts plus the delayed/lagging zeros confirm a 4-pole NO plus 1 NC arrangement). The coil is 125 VDC, which is a less common control voltage — you'll see it in DC control panels, battery-backed systems, or older industrial DC buses. The switching current depends heavily on the voltage you're switching. At 24 V it's rated for 10 A — that's your heavy-signal or small-load capacity. At 110 V it drops to 1 A, at 230 V it's 6 A (likely resistive or AC-1 duty), and at 690 V it's still good for 1 A. The 125 VDC coil pulls 11 W to close and holds at 4 W — the varistor surge suppressor is built in, so you don't need an external flyback diode on the coil, but verify polarity if your circuit expects one. Contact reliability is rated at one incorrect operation per 100 million cycles at 17 V, 1 mA — that's gold-level reliability for dry switching (PLC inputs, signal-level loads). Shock resistance is 10g for 5 ms and 5g for 10 ms, so it'll survive on a vibrating conveyor or pump skid. Mounting is screw or snap-on — the 45 mm wide body clips onto standard 35 mm DIN rail and can be rotated ±180° on a vertical surface, or tilted ±22.5° forward/backward. Wire capacity is generous: two conductors up to 1.5 mm², two up to 2.5 mm², or a single 4 mm² per terminal — spring-cage terminals (implied by the solid-wire ranges) make fast work of field wiring. The auxiliary switch can be extended (product extension auxiliary switch = yes), so you can add more contact blocks on the side if the 4 NO + 1 NC isn't enough for your feedback or interlock scheme.","metaTitle":"Siemens 3RH1131-1KG40-0LA2 SIRIUS Auxiliary Contactor, 4 NO","metaDescription":"Siemens 3RH1131-1KG40-0LA2 SIRIUS auxiliary contactor, size S00, 4 NO + 1 NC contacts, 125 VDC coil, 45 mm wide, IP20 front, active production. Sourced 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","Rated Value":"125 V","Initial Value":"0.7","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-40 ... +70 °C","During Transport":"-55 ... +80 °C","Fastening Method":"screw and snap-on mounting","Full-Scale Value":"1.25","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)":"07/01/2006","Design Of The Surge Suppressor":"with varistor","protection class IP on the front":"IP20","Product Extension Auxiliary Switch":"Yes","closing power of magnet coil at DC":"11 W","holding power of magnet coil at DC":"4 W","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","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":"3","Type Of Voltage Of The Control Supply Voltage":"DC","Identification Number And Letter For Switching Elements":"30 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=141326&mlfb=3RH1131-1KG40-0LA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1131-1KG40-0LA2/alternatives.json"},"ai":{"faq":[{"question":"What wire sizes does it accept?","answer":"Terminals accept 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm² solid conductor per clamp."},{"question":"Will it drop into a panel designed for a 3RT1015-1BB42 contactor?","answer":"Both are size S00 frame, so the DIN-rail footprint and panel cutout are identical. The 3RH1131 is an auxiliary contactor (relay block), while the 3RT1015 is a power contactor — they share the same mounting but serve different functions. If the panel was wired for a power contactor, rewiring is needed because the 3RH1131 lacks main power poles."},{"question":"What compliance documentation is available?","answer":"RoHS compliance date is 07/01/2006. The surge suppressor is a built-in varistor. Standard Siemens documentation includes CE, UL, and CSA certifications per the SIRIUS series. Specific cert numbers are not listed in this spec set."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1131-1KG40-0LA2","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/3RH1131-1KG40-0LA2 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}}