{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2015-1SB42","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2015-1SB42","canonicalUrl":"https://aoctrl.com/siemens/3RT2015-1SB42","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2015-1SB42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2015-1SB42 coupling contactor, Size S00, 24 VDC coil, screw-type terminals, 45 x 58 x 73 mm, current production.","salesMarkdown":"The Siemens SIRIUS 3RT2015-1SB42 is a Size S00 coupling contactor — a 24 VDC coil, screw-type terminal block with a 45 mm wide footprint that wires up clean on a 35 mm DIN rail. This is the part you reach for when you need to switch a DC load in a control panel and the coil voltage is fixed at 24 VDC. The contactor is rated for 10 A at 24 VDC, 2 A at 48 VDC, and 0.75 hp at 230 V, so it handles small motors, solenoid valves, and signal-level loads within a compact envelope. The screw terminals accept solid or stranded wire from 0.5 to 4 mm², and can take two conductors per clamp (2x 0.5-1.5 mm², 2x 0.75-2.5 mm², or 2x 4 mm²). That means you can daisy-chain a feed-through without an extra terminal block, which keeps the wiring channel clean. The contactor has no built-in auxiliary switch, so if you need a feedback signal to a PLC input, you add a separate auxiliary contact block. ## Switching performance and thermal limits The maximum switching frequency depends on the duty class: 1,000 cycles per hour for AC-1 resistive loads, 750 cycles per hour for AC-2 and AC-3 motor starts, and 250 cycles per hour for AC-4 plugging or inching duty. The coil pick-up voltage is 0.85 x rated (20.4 VDC) and drop-out is 1.85 x rated (44.4 VDC), so it holds in during a brownout but drops cleanly when the control voltage disappears.","metaTitle":"Siemens 3RT2015-1SB42 SIRIUS Coupling Contactor, 24 VDC, Siz","metaDescription":"Siemens SIRIUS 3RT2015-1SB42 coupling contactor, 24 VDC coil, Size S00 frame, 45 mm wide, screw terminals, 10 A at 24 VDC. Current production. DIN rail mount.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Solid":"0.5 ... 4 mm²","Width":"45 mm","at DC":"5 ... 20 ms","Height":"58 mm","Upwards":"10 mm","Forwards":"10 mm","Stranded":"0.5 ... 4 mm²","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","Rated Value":"24 V","Initial Value":"0.85","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-type terminals","at AC-1 maximum":"1 000 1/h","at AC-2 maximum":"750 1/h","at AC-3 maximum":"750 1/h","at AC-4 maximum":"250 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":"1.85","at AC-3e maximum":"750 1/h","For Main Contacts":"20 ... 12","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":"S00","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Product Brand Name":"SIRIUS","Product Designation":"Coupling contactor","at 24 V rated value":"10 A","at 48 V rated value":"2 A","at 60 V rated value":"2 A","Of Contactor Typical":"30 000 000","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":"0.75 hp","at 400 V rated value":"3 A","at 440 V rated value":"0.14 A","at 480 V rated value":"4.8 A","at 500 V rated value":"2 A","at 600 V rated value":"6.1 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Auxiliary Contacts":"20 ... 12","For Main Current Circuit":"screw-type terminals","at 110/120 V rated value":"0.25 hp","at 200/208 V rated value":"1.5 hp","at 220/230 V rated value":"2 hp","at 460/480 V rated value":"3 hp","at 575/600 V rated value":"5 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":"0.6 W","at AC-3e rated value maximum":"690 V","at AC-4 at 400 V rated value":"6.5 A","safety-related switching OFF":"Yes","Substance Prohibitance (Date)":"10/01/2009","Design Of The Surge Suppressor":"suppressor diode","Of Auxiliary Circuit Rated Value":"6 kV","at AC-5a up to 690 V rated value":"15.8 A","at AC-5b up to 400 V rated value":"5.8 A","For Auxiliary And Control Circuit":"screw-type terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gG: 20A (690V,100kA), aM: 16A (690V, 100kA), BS88: 20A (415V, 80kA)","Without Load Current Share Typical":"1.6 W","closing power of magnet coil at DC":"1.6 W","holding power of magnet coil at DC":"1.6 W","At Contactor For Auxiliary Contacts":"Screw-type terminals","With Type Of Coordination 1 Required":"gG: 35A (690V,100kA), aM: 20A (690V,100kA), BS88: 35A (415V,80kA)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"0.2 W","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 2x 12","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":"DC","Limited To 1 S Switching At Zero Current Maximum":"120 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"86 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"67 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"52 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"43 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 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":"2.5 mm²","number of NC contacts for auxiliary contacts instantaneous contact":"1","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/e22b5d384d960ced6b840e3b773444b6.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=526742&mlfb=3RT2015-1SB42","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2015-1SB42/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source — 3RT2015-2SB41?","answer":"The 3RT2015-2SB41 is the spring-cage terminal version of the same contactor. Same Size S00 frame, same 45 mm width, same 24 VDC coil, same switching ratings. The difference is the termination method: screw-type on this -1SB42 versus spring-cage on the -2SB41. If your panel wiring practice uses ferruled stranded wire and you prefer a screwdriver torque, stick with the -1SB42."},{"question":"What is the depth of this contactor?","answer":"73 mm. That fits standard 80 mm deep enclosures with room for wiring clearance behind the DIN rail."},{"question":"What wire sizes does it accept?","answer":"Solid or stranded wire from 0.5 to 4 mm². The screw terminals can also take two conductors per clamp: 2x 0.5-1.5 mm², 2x 0.75-2.5 mm², or 2x 4 mm²."},{"question":"Will this drop into a panel specified for 3RT2015-2SB41 without rewiring?","answer":"Yes, the footprint, DIN rail position, and coil voltage are identical. The only difference is the terminal type — screw vs. spring-cage. If the panel was wired for the spring-cage version, you can swap to the screw-terminal version without moving the DIN rail or changing the wire routing. The wire entry points are in the same location."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2015-1SB42","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/3RT2015-1SB42 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}}