{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2037-1NB34","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2037-1NB34","canonicalUrl":"https://aoctrl.com/siemens/3RT2037-1NB34","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2037-1NB34","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, Size S2 power contactor, 3RT2037-1NB34, 20-33 V AC/DC coil, screw-type terminals, 18-pole main contact configuration, 55 mm width, DIN rail mount.","salesMarkdown":"## SIRIUS Size S2 power contactor — 3RT2037-1NB34 The Siemens SIRIUS 3RT2037-1NB34 is a Size S2 power contactor with an 18-pole main contact set, designed for screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715. The coil accepts 20-33 V AC/DC, drawing 2 VA at 50 or 60 Hz, with an inrush peak of 3 A. Screw-type coil terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded wire. ## Duty ratings and switching frequency Switching frequency varies by duty class: AC-1 (resistive) max 800 operations/hour, AC-2 (slip-ring motor) 400 ops/h, AC-3 (squirrel-cage motor) 700 ops/h, AC-3e (enhanced AC-3) also 700 ops/h, and AC-4 (plugging/inching) 200 ops/h. The AC-3 and AC-3e ratings match typical motor-starting applications — the 700 ops/h ceiling means it handles frequent cycling on conveyors or pump stations without exceeding thermal limits. ## Mounting and environmental flexibility The envelope measures 114 mm high, 55 mm wide, and 174 mm deep — the 55 mm width means it occupies three standard 18 mm DIN-rail module spaces, so panel fill factor is straightforward to estimate. The operating range covers most indoor industrial enclosures without derating, though sustained ambient above 60 °C would require thermal review. The contactor comes without an auxiliary switch block (Auxiliary Switch: No). For applications requiring auxiliary contacts, a separate add-on block must be ordered. When added, the auxiliary contact breaking capacity at 24 V rated value is 6 A, at 48 V and 60 V it is 2 A, at 110 V it is 1 A, at 125 V it is 0.9 A, and at 220 V it is 0.3 A.","metaTitle":"Siemens 3RT2037-1NB34 SIRIUS Power Contactor, 20-33 V Coil","metaDescription":"Siemens SIRIUS 3RT2037-1NB34 Size S2 power contactor. 20-33 V AC/DC coil, screw terminals, 18-pole main contact set. DIN rail mount. Current lifecycle. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"174 mm","Width":"55 mm","at AC":"30 ... 55 ms","at DC":"30 ... 55 ms","Height":"114 mm","Upwards":"10 mm","Forwards":"10 mm","at 50 Hz":"2 VA","at 60 Hz":"2 VA","Downwards":"10 mm","Arcing Time":"10 ... 20 ms","At The Side":"6 mm","Rated Value":"20 ... 33 V","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-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":"No","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715","Full-Scale Value":"1.1","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 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Inrush Current Peak":"3 A","Product Designation":"Power contactor","at 24 V rated value":"6 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":"20 ... 33 V","at 500 V rated value":"2 A","at 60 Hz rated value":"20 ... 33 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","Locked-Rotor Current Peak":"2.6 A","Relative Humidity Minimum":"10 %","Holding Current Mean Value":"40 mA","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","Design Of The Surge Suppressor":"with varistor","Duration Of Inrush Current Peak":"50 µs","Locked-Rotor Current Mean Value":"1 A","Duration Of Locked-Rotor Current":"230 ms","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":"screw-type 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":"2 W","closing power of magnet coil at DC":"23 W","holding power of magnet coil at DC":"1 W","At Contactor For Auxiliary Contacts":"Screw-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 ... 16), 2x (18 ... 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), 2x (0.75 ... 2.5 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 %","with high demand rate according to SN 31920":"73 %","Type Of Voltage Of The Control Supply Voltage":"AC/DC","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 / Q600","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":"2","number of NO contacts for auxiliary contacts instantaneous contact":"2","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$177.80","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/038602df62d3b810b43ef8347cf6d9be.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=297327&mlfb=3RT2037-1NB34","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2037-1NB34/alternatives.json"},"ai":{"faq":[{"question":"What is the coil voltage range for 3RT2037-1NB34?","answer":"The coil accepts 20-33 V AC/DC, drawing 2 VA at 50 or 60 Hz, with an inrush peak of 3 A."},{"question":"What is the maximum switching frequency in AC-3 duty?","answer":"In AC-3 (squirrel-cage motor) duty, the maximum switching frequency is 700 operations per hour. AC-3e (enhanced) also rates 700 ops/h."},{"question":"Where can I buy 3RT2037-1NB34 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or price is published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2037-1NB34","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/3RT2037-1NB34 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}}