{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2637-1AF05","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2637-1AF05","canonicalUrl":"https://aoctrl.com/siemens/3RT2637-1AF05","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2637-1AF05","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS capacitor contactor, size S2, order code 3RT2637-1AF05, screw and snap-on 35 mm DIN rail mount, 65 mm wide, 114 mm tall, 130 mm deep.","salesMarkdown":"## Capacitor switching – what the ratings mean The 3RT2637-1AF05 is a SIRIUS capacitor contactor, size S2, designed specifically for switching power-factor-correction capacitor banks. Unlike a standard contactor, it includes pre-charge resistors to limit inrush current when the capacitors are switched on – without those, the transient could weld the main contacts or trip upstream protection. The switching capacity is voltage-dependent: at 230 V AC it handles 6 A, at 400 V AC it handles 3 A, and at 690 V AC the rating drops to 0 A, meaning this size is not intended for 690 V capacitor banks. Maximum switching frequency also falls with voltage – at 400 V it can cycle 100 times per hour, at 600 V only 32 times per hour. That matters for fast-switching PFC banks; if your system cycles more often, you need a larger contactor or a different topology. That helps when fitting into a crowded panel where the capacitor bank sits at an odd angle. The S2 frame size – 65 mm wide, 114 mm tall, 130 mm deep – is compact enough for multi-contactor PFC assemblies.","metaTitle":"Siemens 3RT2637-1AF05 SIRIUS Capacitor Contactor, S2, 65 mm","metaDescription":"Siemens 3RT2637-1AF05 SIRIUS capacitor contactor, size S2, 65 mm wide. Rated for switching capacitor banks up to 690 V. Screw and snap-on DIN rail mount. Current production. Quoted","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":"110 V","Instantaneous Contact":"0","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":"2","number of NO contacts for auxiliary contacts":"0","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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=324835&mlfb=3RT2637-1AF05","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2637-1AF05/alternatives.json"},"ai":{"faq":[{"question":"What is the switching capacity of 3RT2637-1AF05 at 400 V?","answer":"At 400 V AC the contactor is rated for 3 A. At 230 V AC it handles 6 A; at 690 V AC the rating is 0 A – this size is not intended for 690 V capacitor banks."},{"question":"Where can I buy 3RT2637-1AF05?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What wire sizes does 3RT2637-1AF05 accept?","answer":"Solid conductors: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², 2x 4 mm². Stranded conductors: 2x 10–35 mm², 1x 10–50 mm². At 40 °C, 1x 50 mm²; at 60 °C, 2x 35 mm²."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2637-1AF05","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/3RT2637-1AF05 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}}