{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT7037-1AL20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT7037-1AL20","canonicalUrl":"https://aoctrl.com/siemens/3RT7037-1AL20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT7037-1AL20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT7037-1AL20, Size S2 contactor, 3-pole, 3 NO main contacts, AC coil 230 V 50/60 Hz, screw-type terminals, IP20 front, IP00 terminal area.","salesMarkdown":"The Siemens 3RT7037-1AL20 is a Size S2 contactor with three normally-open main contacts and an AC coil rated for 230 V at both 50 Hz and 60 Hz. The screw-type terminals on both the main and auxiliary/control circuits make it a straightforward replacement in existing panels — no retooling for cage-clamp or ring-tongue. Dimensions are 112 mm high, 55 mm wide, 115 mm deep — the S2 footprint. Accepts 2 × (0.5 … 1.5 mm²) solid or stranded, or 2 × (0.75 … 2.5 mm²) with ferruled ends. The auxiliary contact block is field-addable — the product extension for auxiliary switches is supported. ## Coil and control considerations The AC coil draws 0.36 A at 50 Hz, 0.38 A at 60 Hz. Closing power is 0.76 W DC holding power — a low steady-state draw that keeps the coil cool in continuous duty. Auxiliary contacts are rated for PLC-level signals: the contact reliability spec says they're acceptable for PLC control at 17 V, 5 mA. For type of coordination 2 (limited short-circuit damage), the required upstream fuse is a gL/gG NH 3NA: 100 A. For type of coordination 1 (no damage to the contactor, but may need contact replacement), the fuse is gL/gG NH 3NA: 160 A. These are the fuse ratings the manufacturer specifies — use them to size the branch circuit protection. Mechanical endurance is not explicitly listed, but the switching frequency limits are: 800 operations per hour maximum at AC-3 (motor starting), 250 operations per hour at AC-4 (plugging/inching). Shock resistance is 15g for 5 ms and 8g for 10 ms sine pulse — enough for most industrial machinery but not for high-g mobile applications.","metaTitle":"Siemens 3RT7037-1AL20 Contactor, S2 Size, 3-Pole, AC Coil 23","metaDescription":"Siemens 3RT7037-1AL20 contactor, S2 frame, 3 NO main contacts, AC coil 230 V 50/60 Hz, screw terminals, IP20 front, active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"115 mm","Width":"55 mm","Height":"112 mm","at 50 Hz":"0.36","at 60 Hz":"0.38","On The Front":"IP20","During Storage":"-25 ... +70 °C","Of The Terminal":"IP00","at AC-3 maximum":"800 1/h","at AC-4 maximum":"250 1/h","lifecycle_stage":"current","During Operation":"-10 ... +55 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","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 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Degree Of Pollution":"3","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 50 Hz rated value":"230 V","at 60 Hz rated value":"230 V","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","Insulation Voltage Rated Value":"690 V","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","With Type Of Assignment 2 Required":"gL/gG NH 3NA: 100 A","closing power of magnet coil at DC":"0.76 W","holding power of magnet coil at DC":"0.35 W","Surge Voltage Resistance Rated Value":"6 kV","With Type Of Coordination 1 Required":"gL/gG NH 3NA: 160 A","shock resistance with sine pulse at AC":"15g / 5 ms, 8g / 10 ms","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"3","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":"3","Contact Reliability Of Auxiliary Contacts":"acceptability for PLC control (17 V, 5 mA)","Type Of Voltage Of The Control Supply Voltage":"AC","operating voltage at AC-3 rated value maximum":"690 V","operational current at DC-13 at 220 V rated value":"0.3 A","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Required Spacing With Side-By-Side Mounting At The Side":"0 mm","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","Connectable Conductor Cross-Section For Main Contacts Finely Stranded With Core End Processing":"25 mm²","Connectable Conductor Cross-Section For Auxiliary Contacts Finely Stranded With Core End Processing":"0.5 ... 2.5 mm²"}},"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=1534121&mlfb=3RT7037-1AL20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT7037-1AL20/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of 3RT7037-1AL20?","answer":"The depth is 115 mm."},{"question":"What is the width of 3RT7037-1AL20?","answer":"The width is 55 mm."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT7037-1AL20","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/3RT7037-1AL20 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}}