{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1344-1DG40-0KA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1344-1DG40-0KA0","canonicalUrl":"https://aoctrl.com/siemens/3RH1344-1DG40-0KA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1344-1DG40-0KA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 4 NO contacts, 125 V DC coil with varistor, screw and snap-on mounting, IP20 front protection.","salesMarkdown":"The Siemens 3RH1344-1DG40-0KA0 is a SIRIUS auxiliary contactor, size S00, with four normally open (NO) instantaneous contacts and a 125 V DC coil that includes a built-in varistor for surge suppression. It's designed to switch control signals in a motor starter or contactor assembly — think of it as the logic-signal relay that tells the main power contactor when to close, or that feeds status back to a PLC. The coil draws 3.2 W during both closing and holding, so there's no inrush spike to size your DC supply around — steady-state power is the same as pull-in. ## Contact ratings — the numbers that decide fit Each NO contact is rated for switching at several common control voltages: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 1 A at 690 V. At 125 V DC (the coil voltage), the contact rating isn't directly listed, but the 24 V and 110 V figures (10 A and 1 A respectively) bracket it; expect the 125 V DC contact rating to be closer to the 1 A mark. For a sourcing decision, this means the contacts handle low-energy signals (e.g., from a sensor or pushbutton) without needing gold plating. Fastening is by screw and snap-on mounting onto a DIN rail. Depth is 111 mm. Wire terminations accept solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm². Compliance documentation covers RoHS (substance prohibition date 07/01/2006) and the standard SIRIUS product declarations. The built-in varistor is the surge suppressor design, so no external RC snubber is needed for coil suppression on DC control circuits.","metaTitle":"Siemens 3RH1344-1DG40-0KA0 SIRIUS Auxiliary Contactor, 4 NO,","metaDescription":"Siemens SIRIUS 3RH1344-1DG40-0KA0 auxiliary contactor, size S00, 4 NO contacts, 125 V DC coil, screw and snap-on mounting, IP20. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"111 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":"0.8","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":"10 000 000","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","Design Of The Surge Suppressor":"with varistor","protection class IP on the front":"IP20","Product Extension Auxiliary Switch":"No","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","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":"4","number of NO contacts for auxiliary contacts":"4","Type Of Voltage Of The Control Supply Voltage":"DC","Identification Number And Letter For Switching Elements":"44","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Required Spacing With Side-By-Side Mounting At The Side":"0 mm","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","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=447812&mlfb=3RH1344-1DG40-0KA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1344-1DG40-0KA0/alternatives.json"},"ai":{"faq":[{"question":"What is 3RH1344-1DG40-0KA0's listed depth?","answer":"The depth is 111 mm, which includes the coil terminals and the built-in varistor. Width is 45 mm, height is 57.5 mm."},{"question":"What wire sizes does the 3RH1344-1DG40-0KA0 accept?","answer":"Solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm²."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1344-1DG40-0KA0","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/3RH1344-1DG40-0KA0 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}}