{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2037-3AL20-ZW97","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2037-3AL20-ZW97","canonicalUrl":"https://aoctrl.com/siemens/3RT2037-3AL20-ZW97","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2037-3AL20-ZW97","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S2 power contactor, 3RT2037-3AL20-ZW97, 65 A at 480 V AC-3, spring-type terminals for main and coil, screw and snap-on 35 mm DIN rail, size S2.","salesMarkdown":"The Siemens 3RT2037-3AL20-ZW97 is a SIRIUS S2 power contactor — the core switching element for motor loads, resistive heaters, and transformer primaries in a 400–480 V panel. Spring-type terminals on the coil mean no screwdriver needed for the control wiring — a time-saver on the line when you're swapping a contactor under a headlamp. The main contacts use the same spring-cage style, accepting 2x 0.5–2.5 mm² solid or stranded. The headline number is 65 A at 480 V under AC-3 duty — that's the motor-switching rating, the one that governs for a standard three-phase induction motor. That puts it in the S2 frame class, good for motors roughly up to 30–40 hp depending on your line voltage and duty cycle. Switching rates vary by duty: 800 cycles/hour for AC-1 resistive loads, 700/h for AC-3 and AC-3e motor starting, 400/h for AC-2 (slip-ring motors), and 200/h for AC-4 (plugging/inching). Pick the rate that matches your application — over-cycling on AC-4 will cook the contacts. Auxiliary contacts are built in: 1 N/O + 1 N/C as standard, which covers the basic feedback to the PLC or safety relay without adding a side-mount block. Coil pickup and dropout timing: 10–18 ms at AC, arcing time 10–20 ms. That's fast enough for most sequencing but worth knowing if you're coordinating with a soft-start or VFD bypass. ## Environmental range and clearances Clearance to adjacent devices: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the side — standard S2 spacing, no surprises.","metaTitle":"Siemens 3RT2037-3AL20-ZW97 SIRIUS S2 Power Contactor, 65 A a","metaDescription":"Siemens SIRIUS S2 power contactor 3RT2037-3AL20-ZW97, 65 A AC-3 at 480 V, spring-type coil terminals, screw/snap-on DIN rail, -25 to +60 °C. Quoted to order.","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 DIN 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":"230 V","at 500 V rated value":"2 A","at 60 Hz rated value":"230 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","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)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"3.8 W","for AWG cables for auxiliary contacts":"2x (20 ... 14)","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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=181642&mlfb=3RT2037-3AL20-ZW97","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2037-3AL20-ZW97/alternatives.json"},"ai":{"faq":[{"question":"What are the key dimensions of 3RT2037-3AL20-ZW97?","answer":"Depth 130 mm, width 55 mm, height 114 mm. It's a standard S2 frame size that fits the usual DIN-rail footprint."},{"question":"What is the AC-3 current rating at 480 V?","answer":"Rated 65 A at 480 V for AC-3 motor duty. That's the figure to use for sizing motor loads."},{"question":"How is this contactor mounted?","answer":"Screw or snap-on mounting onto 35 mm DIN rail per DIN EN 60715. Mounting position allows ±180° rotation on vertical surfaces and ±22.5° tilt forward/backward."},{"question":"Who supplies 3RT2037-3AL20-ZW97 and how is it quoted?","answer":"Sourced and quoted to order through independent distribution. Submit an RFQ for current availability and pricing — confirmed at quote time, not listed here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2037-3AL20-ZW97","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/3RT2037-3AL20-ZW97 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}}