{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2637-1AB03","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2637-1AB03","canonicalUrl":"https://aoctrl.com/siemens/3RT2637-1AB03","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2637-1AB03","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2637-1AB03 capacitor contactor, S2 size, 24 V AC 50 Hz coil, screw-type terminals, 65 mm width, 114 mm height, 130 mm depth, DIN rail mount.","salesMarkdown":"## Capacitor switching duty and coil draw The 3RT2637-1AB03: This is a SIRIUS capacitor contactor (size S2) designed specifically for switching power-factor-correction capacitor banks — the inrush current from a discharged capacitor is handled by the contactor's damping resistors, not the main contacts. The 24 V AC 50 Hz coil draws 6 A at pickup and holds at lower current; the coil connection uses screw-type terminals. Switching frequency is limited by the capacitor discharge cycle: at 230 V and 240 V the contactor can switch 100 times per hour, dropping to 25 cycles per hour at 690 V. This is not a general-purpose contactor for motor starts — the capacitor-specific damping network limits the make/break rate. ## Panel fit and wire termination Main power terminals accept stranded wire from 10 to 50 mm² (single) or 10 to 35 mm² (double). The contactor has one instantaneous auxiliary contact.","metaTitle":"Siemens 3RT2637-1AB03 SIRIUS Capacitor Contactor","metaDescription":"Siemens 3RT2637-1AB03 SIRIUS capacitor contactor, S2 size, 24 VAC 50 Hz coil, screw terminals, DIN rail mount. Current production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"130 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Width":"65 mm","at AC":"10 ... 18 ms","Height":"114 mm","at 24 V":"6 A","at 60 V":"2 A","Stranded":"2x (10 ... 35 mm²), 1x (10 ... 50 mm²)","at 110 V":"1 A","at 125 V":"0.9 A","at 220 V":"0.3 A","at 230 V":"6 A","at 400 V":"3 A","at 50 Hz":"0.8 ... 1.1","at 690 V":"0 A","at 40 °C":"1x 50 mm²","at 60 °C":"2x 35 mm²","Attachable":"1","Arcing Time":"10 ... 20 ms","1 Rated Value":"50 Hz","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-type terminals","Type Of Voltage":"AC","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 50022","at 230 V maximum":"100 1/h","at 240 V maximum":"100 1/h","at 400 V maximum":"100 1/h","at 480 V maximum":"50 1/h","at 500 V maximum":"45 1/h","at 600 V maximum":"32 1/h","at 690 V maximum":"25 1/h","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), 2x 4 mm²","Product Brand Name":"SIRIUS","Product Designation":"capacitor contactors","at 50 Hz rated value":"24 V","Instantaneous Contact":"1","For Main Current Circuit":"screw-type terminals","Relative Humidity Minimum":"10 %","Of Main Circuit Rated Value":"6 kV","Substance Prohibitance (Date)":"05/01/2014","For Grounded Parts At The Side":"10 mm","Of Auxiliary Circuit Rated Value":"6 kV","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","At Contactor For Auxiliary Contacts":"Screw-type terminals","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 2x 12","With Side-By-Side Mounting At The Side":"10 mm","Electrical Endurance (Operating Cycles)":"150 000","number of NC contacts for main contacts":"0","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":"0.00000001","mirror contact according to IEC 60947-4-1":"No","apparent holding power of magnet coil at AC":"16 VA","apparent pick-up power of magnet coil at AC":"190 VA","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","Type Of Voltage Of The Control Supply Voltage":"AC","contact rating of auxiliary contacts according to UL":"A600 / Q600","Inductive Power Factor With Closing Power Of The Coil":"0.72","Of Main Circuit With Degree Of Pollution 3 Rated Value":"690 V","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.37","Of The Contactor With Added Auxiliary Switch Block Typical":"3 000 000","operational current of auxiliary contacts at AC-12 maximum":"10 A","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)","AWG number as coded connectable conductor cross section for main contacts":"18 ... 0","For Short-Circuit Protection Of The Main Circuit With Type Of Coordination 1 Required":"gG: 200 A (690 V, 50 kA)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/eb4fd918b62e77fd69ce85882b9b52a4.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=114917&mlfb=3RT2637-1AB03","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2637-1AB03/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does Siemens provide for 3RT2637-1AB03?","answer":"The evidence does not list specific compliance certifications (RoHS, REACH, UL, IEC) for this order code. Standard Siemens SIRIUS contactors typically carry CE, UL, and CSA marks; confirm the exact documentation package with the supplier at RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2637-1AB03","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/3RT2637-1AB03 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}}