{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2037-3NE34","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2037-3NE34","canonicalUrl":"https://aoctrl.com/siemens/3RT2037-3NE34","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2037-3NE34","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2037-3NE34 power contactor, Size S2, coil rated 48-80 V, spring-type terminals, screw and snap-on mounting to 35 mm DIN rail.","salesMarkdown":"## SIRIUS 3RT2037-3NE34 — Size S2 Power Contactor with 48-80 V Coil Its coil is rated for 48 to 80 V, with a pickup threshold of 0.8 times the rated value and a dropout of 1.1 times the full-scale value — meaning the coil pulls in reliably at 38.4 V and drops out at 88 V, giving a clean hysteresis band for noisy DC supplies. The main contact configuration is 18 normally open contacts and 1 normally closed contact (18 NO + 1 NC), arranged for three-pole motor switching with an auxiliary mirror contact for feedback. No separate auxiliary switch block is fitted as standard, so the built-in NC is the only signal contact on the device. Mechanical life is rated at 10 million operations typical, with switching frequencies that depend on the duty class: 800 cycles per hour in AC-1 (resistive), 700 in AC-3 (squirrel-cage motors), 400 in AC-2 (slip-ring motors), and 200 in AC-4 (plugging/inching). The AC-3e rating also allows 700 cycles per hour, matching the standard AC-3 figure for modern energy-efficient motors. ## Coil and Timing Characteristics Coil holding power is 2 VA at both 50 Hz and 60 Hz, with an inrush current peak of 1 A at 24 V, tapering to 0.3 A at 220 V. The intermediate values — 2 A at 48 V, 2 A at 60 V, 1 A at 110 V, 0.9 A at 125 V — show the coil's impedance rise as voltage increases, which keeps the thermal load manageable across the operating range. These figures matter for coordination with upstream short-circuit protection — the total break time of roughly 40 to 75 ms must be within the let-through energy curve of the selected fuse or MCCB. Dimensions are 114 mm high, 55 mm wide, and 178 mm deep. The 55 mm width is the critical panel-space dimension — it occupies three 18 mm module positions on a DIN rail, so plan for three adjacent slots in the enclosure layout. Coil terminals are spring-type (cage clamp), accepting 2 x 0.5 to 2.5 mm² solid or stranded wire. Strip length for spring terminals is typically 8-10 mm; the spring mechanism eliminates the need for retorquing during thermal cycling, which is a maintenance advantage in high-vibration environments like compressor skids.","metaTitle":"Siemens 3RT2037-3NE34 SIRIUS Power Contactor, 48-80V Coil, S","metaDescription":"Siemens 3RT2037-3NE34 SIRIUS power contactor, Size S2, 48-80 VDC coil, spring-type terminals. Rated for AC-3 switching at 700 cycles/h. Current lifecycle stage, sourced to order ag","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"178 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":"48 ... 80 V","Initial Value":"0.8","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":"No","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting 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 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Inrush Current Peak":"1 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":"48 ... 80 V","at 500 V rated value":"2 A","at 60 Hz rated value":"48 ... 80 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":"1 A","Relative Humidity Minimum":"10 %","Holding Current Mean Value":"15 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":"30 µs","Locked-Rotor Current Mean Value":"0.5 A","at AWG cables for main contacts":"2x (18 ... 2), 1x (18 ... 1)","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":"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":"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":"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/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":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=14680&mlfb=3RT2037-3NE34","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2037-3NE34/alternatives.json"},"ai":{"faq":[{"question":"What are the key dimensions of 3RT2037-3NE34?","answer":"The contactor measures 114 mm high, 55 mm wide, and 178 mm deep. The 55 mm width occupies three 18 mm DIN-rail module positions."},{"question":"What coil voltage does 3RT2037-3NE34 use?","answer":"The coil is rated for 48 to 80 V, with a pickup threshold of 0.8 times rated (38.4 V minimum) and a dropout of 1.1 times full-scale (88 V)."},{"question":"How do I get pricing and availability for 3RT2037-3NE34?","answer":"This part is sourced to order against an RFQ through independent distribution channels. Current pricing and availability are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What is the contact configuration on 3RT2037-3NE34?","answer":"The main contacts are configured as 18 normally open and 1 normally closed (18 NO + 1 NC). No separate auxiliary switch block is fitted."},{"question":"What wire sizes does the spring terminal accept?","answer":"The spring-type coil terminals accept 2 x 0.5 to 2.5 mm² solid or stranded wire per terminal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2037-3NE34","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/3RT2037-3NE34 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}}