{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1015-1KB42","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1015-1KB42","canonicalUrl":"https://aoctrl.com/siemens/3RT1015-1KB42","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1015-1KB42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S00, 3RT1015-1KB42, 24 V DC coil, screw-type terminals, IP20 degree of protection, for 35 mm DIN rail mounting.","salesMarkdown":"The Siemens 3RT1015-1KB42 is a SIRIUS power contactor in frame size S00 — the smallest footprint in the SIRIUS family, at 45 mm wide, 57.5 mm tall, and 72 mm deep. That compact envelope fits densely packed control panels where every DIN-rail millimeter counts. The contactor is rated for motor switching: 3 kW at 400 V in AC-2 duty (slip-ring motors, wound rotor) and 6.5 A in AC-4 duty (plugging, inching, reversing) at the same voltage. For resistive or general-purpose loads, the AC-1 rating would be higher, but the AC-3 and AC-4 numbers are the ones that govern motor branch circuits. The screw-type terminals on both main and auxiliary circuits accept solid or stranded conductors up to 4 mm² (or 2x 2.5 mm²), which is typical for motor loads up to the 3 kW / 6.5 A range. The varistor surge suppressor is built in across the coil, so no external flyback diode or RC snubber is needed for the DC coil circuit. The 3RT1015-1KB42 is the current design. If a buyer is looking for a functional equivalent from the same SIRIUS family, the closest sibling in the 3RT series would share the same S00 frame and 24 V DC coil but differ in auxiliary contact configuration or surge suppressor type — those are the variables to check on the nameplate. Both screw-clamp and snap-on mounting are supported, so it can be clipped onto the rail without tools or screwed down for vibration resistance. Side-by-side mounting is permitted, meaning zero clearance between contactors on the rail, which is standard for S00 frame devices.","metaTitle":"Siemens 3RT1015-1KB42 SIRIUS Power Contactor, 24 VDC Coil","metaDescription":"Siemens 3RT1015-1KB42 SIRIUS power contactor, size S00, 24 VDC coil, 10 A at 24 V, screw terminals, IP20. Active production, sourced to order. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"72 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)","Width":"45 mm","Height":"57.5 mm","Rated Value":"24 V","On The Front":"IP20","Initial Value":"0.7","Of The Terminal":"IP20","lifecycle_stage":"current","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Full-Scale Value":"1.25","Size Of Contactor":"S00","Solid Or Stranded":"2x (0,5 ... 1,5 mm²), 2x (0,75 ... 2,5 mm²), max. 2x (0,75 ... 4 mm²)","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"power contactor","at 24 V rated value":"10 A","at 60 V rated value":"2 A","Of Contactor Typical":"30 000 000","at 110 V rated value":"1 A","at 220 V rated value":"0.3 A","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 500 V rated value":"3.5 kW","at 690 V rated value":"4 kW","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"3 kW","at AC-4 at 400 V rated value":"6.5 A","Substance Prohibitance (Date)":"01.07.2006 00:00:00","Design Of The Surge Suppressor":"with varistor","at AWG cables for main contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","For Auxiliary And Control Circuit":"screw-type terminals","With Type Of Assignment 2 Required":"fuse gL/gG: 20 A","closing power of magnet coil at DC":"2.3 W","holding power of magnet coil at DC":"2.3 W","reference code acc. to IEC 81346-2":"Q","Ambient Temperature During Operation":"-25 ... +60 °C","With Type Of Coordination 1 Required":"fuse gL/gG: 35 A","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","operational current at AC-12 maximum":"10 A","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"3","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)","Type Of Voltage Of The Control Supply Voltage":"DC","Required Spacing For Grounded Parts At The Side":"6 mm","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","number of NC contacts for auxiliary contacts instantaneous contact":"1","number of NO contacts for auxiliary contacts instantaneous contact":"0"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$90.02","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=41034&mlfb=3RT1015-1KB42","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1015-1KB42/alternatives.json"},"ai":{"faq":[{"question":"Can I use 3RT2015-1KB42 as a direct replacement for 3RT1015-1KB42?","answer":"The 3RT2015-1KB42 is a different series within the SIRIUS family. While it shares the same S00 frame size and 24 V DC coil voltage, the auxiliary contact configuration, surge suppressor type, and terminal layout may differ. Check the nameplate and wiring diagram before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1015-1KB42","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/3RT1015-1KB42 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}}