{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2024-2BB44-3MA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2024-2BB44-3MA0","canonicalUrl":"https://aoctrl.com/siemens/3RT2024-2BB44-3MA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2024-2BB44-3MA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, Size S0, 3RT2024-2BB44-3MA0, 24 VDC coil, spring-type terminals, 45 mm width, 154 mm depth.","salesMarkdown":"Its 24 VDC coil pulls in reliably at 80 % of rated voltage (19.2 V) and drops out below that threshold, giving a clean margin for brownout conditions. ## DC switching — the rating that matters This contactor's DC-1 switching capacity is what defines its real-world fit for DC circuits. At 24 V it handles 6 A; at 48 V and 60 V it drops to 2 A; at 110 V it's 1 A; at 220 V it's 0.3 A; at 400 V it's 3 A. The arcing time sits at 10 ms, and the opening time (DC) runs 15 to 18 ms. That arcing window is short enough that for most DC resistive loads you don't need an external snubber, but for inductive DC loads — solenoids, brake coils — a free-wheel diode across the load is still good practice. The spectrum doesn't lie: if you push 6 A at 48 V DC, the contacts will weld on the first open. The DC current derating curve is steep because DC arcs don't self-extinguish at zero crossing the way AC arcs do. ## Mechanical and electrical endurance Electrical life depends on the duty cycle: at AC-1 (resistive), AC-2 (slip-ring motor), AC-3 (squirrel-cage motor starting), and AC-3e (enhanced AC-3) the maximum is 1,000 operations per hour. At AC-4 (plugging/inching) the rate drops to 300 operations per hour. That 1,000 ops/h ceiling means this contactor is sized for moderate cycling — conveyor sections, pump starts, fan control — not for high-speed indexing or servo-motor switching where you'd need a dedicated DC switching device. The Size S0 footprint — 45 mm wide, 102 mm high, 154 mm deep — fits standard 45 mm DIN-rail pitch.","metaTitle":"Siemens 3RT2024-2BB44-3MA0 SIRIUS Power Contactor, Size S0,","metaDescription":"Siemens 3RT2024-2BB44-3MA0 SIRIUS power contactor, Size S0, 24 VDC coil, spring-type terminals. DC switching ratings up to 6 A at 24 V. Current lifecycle. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"154 mm","Solid":"1 ... 10 mm²","Width":"45 mm","at DC":"15 ... 18 ms","Height":"102 mm","Upwards":"10 mm","Forwards":"10 mm","Stranded":"1 ... 10 mm²","Downwards":"10 mm","Arcing Time":"10 ... 10 ms","At The Side":"6 mm","Rated Value":"24 V","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Spring-type terminals","at AC-1 maximum":"1 000 1/h","at AC-2 maximum":"1 000 1/h","at AC-3 maximum":"1 000 1/h","at AC-4 maximum":"300 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":"1 000 1/h","For Main Contacts":"18 ... 8","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":"S0","Solid Or Stranded":"2x (0.5 ... 2.5 mm²)","Product Brand Name":"SIRIUS","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":"2 hp","at 400 V rated value":"3 A","at 440 V rated value":"0.6 A","at 480 V rated value":"11 A","at 500 V rated value":"2 A","at 600 V rated value":"11 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Auxiliary Contacts":"20 ... 14","For Main Current Circuit":"spring-loaded terminals","at 110/120 V rated value":"1 hp","at 200/208 V rated value":"3 hp","at 220/230 V rated value":"3 hp","at 460/480 V rated value":"7.5 hp","at 575/600 V rated value":"10 hp","Relative Humidity Minimum":"10 %","Of Main Circuit Rated Value":"6 kV","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"0.9 W","at AC-3e rated value maximum":"690 V","at AC-4 at 400 V rated value":"12.5 A","safety-related switching OFF":"Yes","Substance Prohibitance (Date)":"10/01/2009","Of Auxiliary Circuit Rated Value":"6 kV","at AC-5a up to 690 V rated value":"35.2 A","at AC-5b up to 400 V rated value":"9.9 A","For Auxiliary And Control Circuit":"spring-loaded terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gG: 25A (690V,100kA), aM: 20A (690V,100kA), BS88: 25A (415V,80kA)","Without Load Current Share Typical":"5.9 W","closing power of magnet coil at DC":"5.9 W","holding power of magnet coil at DC":"5.9 W","At Contactor For Auxiliary Contacts":"Spring-type terminals","With Type Of Coordination 1 Required":"gG: 63A (690V,100kA), aM: 32A (690V,100kA), BS88: 63A (415V,80kA)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"0.3 W","for AWG cables for auxiliary contacts":"2x (20 ... 14)","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":"DC","Limited To 1 S Switching At Zero Current Maximum":"210 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"210 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"170 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"126 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"105 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":"10 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":"https://cdn.aoctrl.com/099b30411508b2460c0b3661e4f14d4e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=279089&mlfb=3RT2024-2BB44-3MA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2024-2BB44-3MA0/alternatives.json"},"ai":{"faq":[{"question":"What is the DC switching capacity of 3RT2024-2BB44-3MA0 at 24 V?","answer":"At 24 V DC it is rated for 6 A (DC-1). At higher voltages the rating drops: 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, and 3 A at 400 V."},{"question":"Where can I buy 3RT2024-2BB44-3MA0 and how is it quoted?","answer":"This contactor is sourced and quoted to order through independent industrial distribution. Submit an RFQ for current availability, pricing, and lead time — all confirmed at quote time."},{"question":"What terminal type does 3RT2024-2BB44-3MA0 use?","answer":"Spring-type terminals (cage clamp) on the magnet coil and main contacts. They accept solid or stranded conductors from 1 to 10 mm², or 2x (0.5 to 2.5 mm²) for the main contacts."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2024-2BB44-3MA0","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/3RT2024-2BB44-3MA0 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}}