{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2037-3AC20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2037-3AC20","canonicalUrl":"https://aoctrl.com/siemens/3RT2037-3AC20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2037-3AC20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S2 power contactor, 3RT2037-3AC20, 65 A at 480 V AC-3, spring-type coil terminals, screw and snap-on DIN rail mount.","salesMarkdown":"The Siemens 3RT2037-3AC20 is a SIRIUS S2-frame power contactor rated for 65 A at 480 V in AC-3 duty — the motor-switching curve that governs most induction-motor loads up to that current. The S2 frame footprint is 55 mm wide, 114 mm tall, and 130 mm deep. ## Switching performance and operating rates Maximum operating frequency varies by duty: 800 cycles/hour for AC-1 resistive loads, 700 cycles/hour for AC-3 motor starting, and 200 cycles/hour for AC-4 plugging/reversing. Arcing time spans 10 to 20 ms; the main contactor is rated for 10 million mechanical operations typical. ## Environmental limits and auxiliary contacts Coil draws 0.36 A at 50 Hz and 0.39 A at 60 Hz at 24 V rated value.","metaTitle":"Siemens 3RT2037-3AC20 SIRIUS Power Contactor, 65 A at 480 V","metaDescription":"Siemens SIRIUS 3RT2037-3AC20 power contactor, S2 frame, 65 A AC-3 at 480 V. Active lifecycle. Spring-type terminals. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"130 mm","Width":"55 mm","at AC":"10 ... 18 ms","Height":"114 mm","Upwards":"10 mm","Forwards":"10 mm","at 50 Hz":"0.36","at 60 Hz":"0.39","Downwards":"10 mm","Arcing Time":"10 ... 20 ms","At The Side":"6 mm","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Spring-type terminals","at AC-1 maximum":"800 1/h","at AC-2 maximum":"400 1/h","at AC-3 maximum":"700 1/h","at AC-4 maximum":"200 1/h","lifecycle_stage":"current","Auxiliary Switch":"Yes","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715","at AC-3e maximum":"700 1/h","For Main Contacts":"18 ... 1","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":"S2","Solid Or Stranded":"2x (0.5 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Power contactor","at 24 V rated value":"10 A","at 48 V rated value":"2 A","at 60 V rated value":"2 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"1 A","at 125 V rated value":"0.9 A","at 220 V rated value":"0.3 A","at 230 V rated value":"10 hp","at 400 V rated value":"3 A","at 440 V rated value":"0.6 A","at 480 V rated value":"65 A","at 50 Hz rated value":"24 V","at 500 V rated value":"2 A","at 60 Hz rated value":"24 V","at 600 V rated value":"52 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Auxiliary Contacts":"20 ... 14","For Main Current Circuit":"screw-type terminals","at 110/120 V rated value":"5 hp","at 200/208 V rated value":"20 hp","at 220/230 V rated value":"20 hp","at 460/480 V rated value":"50 hp","at 575/600 V rated value":"50 hp","Relative Humidity Minimum":"10 %","Of Main Circuit Rated Value":"6 kV","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"11.4 W","at AC-2 at 400 V rated value":"30 kW","at AC-3e rated value maximum":"690 V","at AC-4 at 400 V rated value":"55 A","safety-related switching OFF":"Yes","Substance Prohibitance (Date)":"10/01/2014","at AWG cables for main contacts":"2x (18 ... 2), 1x (18 ... 1)","Of Auxiliary Circuit Rated Value":"6 kV","at AC-5a up to 690 V rated value":"70.4 A","at AC-5b up to 400 V rated value":"53.9 A","For Auxiliary And Control Circuit":"spring-loaded terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gG: 125A (690V,100kA), aM: 63A (690V,100kA), BS88: 100A (415V,80kA)","Without Load Current Share Typical":"17.2 W","At Contactor For Auxiliary Contacts":"Spring-type terminals","With Type Of Coordination 1 Required":"gG: 250 A (690 V, 100 kA), aM: 160 A (690 V, 100 kA), BS88: 200 A (415 V, 80 kA)","at AWG cables for auxiliary contacts":"2x (20 ... 14)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"3.8 W","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","mirror contact according to IEC 60947-4-1":"Yes","with low demand rate according to SN 31920":"40 %","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","with high demand rate according to SN 31920":"73 %","Type Of Voltage Of The Control Supply Voltage":"AC","Limited To 1 S Switching At Zero Current Maximum":"1 055 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"730 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"520 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"336 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"272 A; Use minimum cross-section acc. to AC-1 rated value","contact rating of auxiliary contacts according to UL":"A600 / P600","Of Main Circuit With Degree Of Pollution 3 Rated Value":"690 V","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","Of Auxiliary Circuit With Degree Of Pollution 3 Rated Value":"690 V","For Short-Circuit Protection Of The Auxiliary Switch Required":"gG: 10 A (500 V, 1 kA)","minimum cross-section in main circuit at maximum AC-1 rated value":"25 mm²","number of NC contacts for auxiliary contacts instantaneous contact":"1","number of NO contacts for auxiliary contacts instantaneous contact":"1","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":"https://cdn.aoctrl.com/a77323bd0db1832977acad4753703d8c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=19500&mlfb=3RT2037-3AC20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2037-3AC20/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for 3RT2037-3AC20?","answer":"The 3RT2015-2AP02 is a smaller S0-frame contactor from the same SIRIUS family, but it does not match the 65 A AC-3 rating of the S2-frame 3RT2037-3AC20. A panel built around the S0 frame would need rewiring to accommodate the larger S2 footprint and higher current path."},{"question":"What are the key dimensions of 3RT2037-3AC20?","answer":"Width 55 mm, height 114 mm, depth 130 mm. Clearance: 10 mm upward, forward, and downward; 6 mm to the side."},{"question":"Where can I buy 3RT2037-3AC20?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2037-3AC20","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/3RT2037-3AC20 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}}