{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1344-1AH20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1344-1AH20","canonicalUrl":"https://aoctrl.com/siemens/3RT1344-1AH20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1344-1AH20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S3 power contactor, 3RT1344-1AH20, screw-type terminals, 42 kW at 230 V, 1000 V insulation voltage, IP20 front, size S3.","salesMarkdown":"The Siemens 3RT1344-1AH20 is a SIRIUS S3 power contactor — a screw-terminal, three-pole unit rated for switching motor loads up to 42 kW at 230 V (AC-3 duty at 60 °C) and carrying a 1000 V insulation voltage rating. Pollution degree 3 (conductive pollution, typical for control enclosures without climate control) is baked into the design. The size S3 frame (146 x 93 x 139 mm) fits standard panel layouts with side-by-side mounting permitted, so you can pack multiple contactors without derating for heat buildup. Front face carries IP20 protection — safe for finger contact in a closed cabinet. The terminal area is IP00, meaning the main circuit lugs are exposed once the cover is off; standard panel practice applies. RoHS compliance date is 05/01/2012. ## Termination & Wiring Solid wire capacity: 2x (0.5...1.5 mm²), 2x (0.75...2.5 mm²), max 2x (0.75...4 mm²). Stranded: 2x (10...50 mm²). Minimum permissible cross-section at 40 °C and 60 °C is 35 mm² — that's the thermal limit for continuous current; the contactor can accept smaller wire for control circuits, but the main circuit should not be undersized below that. ## Coil & Switching Characteristics Rated control supply voltage: 48 V at 50/60 Hz. Operating range: 0.8...1.1 x Us at 50 Hz, 0.85...1.1 at 60 Hz. Drop-out and arcing times: 10...25 ms AC (10...15 ms arcing). Switching frequency at AC-1: up to 1000 operations per hour. Rated breaking capacity at 24 V: 10 A; at 60 V: 2 A; at 110 V: 1 A; at 220 V: 0.3 A; at 230 V: 6 A; at 400 V: 3 A. These are DC switching values — important when using the contactor for DC loads or in DC-intermediate circuits. ## Environmental & Mechanical Operating temperature: -25 to +60 °C. Storage: -55 to +80 °C. Mechanical service life: 10 million operations typical. The wide storage range covers most transport and warehouse conditions.","metaTitle":"Siemens 3RT1344-1AH20 SIRIUS Power Contactor, S3, 42 kW at 2","metaDescription":"Siemens 3RT1344-1AH20 SIRIUS S3 power contactor. Rated 42 kW at 230 V, 1000 V insulation voltage, screw terminals, IP20 front. Current-production part, quoted to order. Request a q","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"139 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)","Width":"93 mm","at AC":"10 ... 25 ms","Height":"146 mm","Stranded":"2x (10 ... 50 mm²)","at 50 Hz":"0.8 ... 1.1","at 60 Hz":"0.85 ... 1.1","Arcing Time":"10 ... 15 ms","On The Front":"IP20; IP20 on the front with cover / box terminal","1 Rated Value":"50 Hz","2 Rated Value":"60 Hz","During Storage":"-55 ... +80 °C","Of The Terminal":"IP00","at AC-1 maximum":"1 000 1/h","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm and 75 mm standard mounting rail","Size Of Contactor":"S3","Solid Or Stranded":"2x (2.5 ... 16 mm²)","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"power contactor","at 24 V rated value":"10 A","at 60 V rated value":"2 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"1 A","at 220 V rated value":"0.3 A","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 50 Hz rated value":"48 V","at 60 Hz rated value":"48 V","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","Substance Prohibitance (Date)":"05/01/2012","at 40 °C minimum permissible":"35 mm²","at 60 °C minimum permissible":"35 mm²","Insulation Voltage Rated Value":"1 000 V","at 230 V at 60 °C rated value":"42 kW","at AWG cables for main contacts":"2x (10 ... 1/0)","For Auxiliary And Control Circuit":"screw-type terminals","With Type Of Assignment 2 Required":"fuse gL/gG: 125 A","Surge Voltage Resistance Rated Value":"6 kV","With Type Of Coordination 1 Required":"fuse gL/gG: 250 A","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","operational current at AC-12 maximum":"10 A","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"4","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Number Of Poles For Main Current Circuit":"4","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Thermal Short-Time Current Limited To 10 S":"600 A","Finely Stranded Without Core End Processing":"2x (10 ... 35 mm²)","apparent holding power of magnet coil at AC":"25 VA","apparent pick-up power of magnet coil at AC":"247 VA","Type Of Voltage Of The Control Supply Voltage":"AC","Required Spacing For Grounded Parts At The Side":"6 mm","contact rating of auxiliary contacts according to UL":"A600 / Q600","Inductive Power Factor With Closing Power Of The Coil":"0.62","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.27","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","number of NC contacts for auxiliary contacts instantaneous contact":"0","number of NO contacts for auxiliary contacts instantaneous contact":"0","Of The Contactor With Added Electronically Optimized 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=86722&mlfb=3RT1344-1AH20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1344-1AH20/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1344-1AH20 and how is it quoted?","answer":"Available through independent distribution. Sourced and quoted to order against an RFQ — availability and current pricing confirmed at quote time."},{"question":"What is the closest functional second-source for 3RT1344-1AH20?","answer":"The closest functional peer in the same SIRIUS family is the 3RT1044-1FB46. Both are S3 size contactors with screw terminals, but the 3RT1044-1FB46 has a different coil voltage (not specified here) and may have slightly different switching ratings. Verify coil voltage and auxiliary contact configuration before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1344-1AH20","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/3RT1344-1AH20 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}}