{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1325-1BB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1325-1BB40","canonicalUrl":"https://aoctrl.com/siemens/3RT1325-1BB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1325-1BB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT1325-1BB40, 24 VDC coil, 4 NO main contacts, screw terminals, size S0, 7.5 kW at AC-2 400 V.","salesMarkdown":"It carries four normally-open main contacts rated for 7.5 kW at AC-2 duty at 400 V — that's the motor-switching curve for slip-ring or wound-rotor motors, so it handles the higher inrush and arcing of those starts. The magnet coil pulls 24 VDC, and it holds at 5.4 W steady-state, which keeps the heat in the panel manageable when the contactor is sealed in. The enclosure face carries IP20 — safe for a closed panel — while the terminal area is IP00, meaning it expects the panel door to provide the final touch-protection barrier. ## Short-circuit coordination and wiring For Type 2 coordination (no welding after a fault) the spec calls for a 25 A gL/gG fuse upstream. For Type 1 coordination (welding allowed, but no fire or shock) it's 63 A. That's a clean choice for the panel builder: if the machine needs to be back online fast after a short, Type 2 with the 25 A fuse keeps the contactor reusable. Main circuit terminals are screw-type, accepting solid 2x (0.5–1.5 mm²) or 2x (0.75–2.5 mm²), with a maximum of 2x (0.75–4 mm²) — fine for the motor leads on a 7.5 kW load. Auxiliary and control circuit terminals are also screw-type, same wire range.","metaTitle":"Siemens 3RT1325-1BB40 SIRIUS Power Contactor, 24 VDC, 7.5 kW","metaDescription":"Siemens SIRIUS 3RT1325-1BB40 power contactor, 24 VDC coil, 4 NO main contacts, 7.5 kW at AC-2 400 V. Current production, sourced to order. RoHS compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"101 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)","Width":"61 mm","Height":"85 mm","Rated Value":"24 V","On The Front":"IP20","Initial Value":"0.8","Of The Terminal":"IP00","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Full-Scale Value":"1.1","Size Of Contactor":"S0","Solid Or Stranded":"2x (1 ... 2,5 mm²), 2x (2,5 ... 6 mm²), max. 2x 10 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":"10 000 000","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","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"7.5 kW","Substance Prohibitance (Date)":"01.07.2006 00:00:00","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: 25 A","closing power of magnet coil at DC":"5.4 W","holding power of magnet coil at DC":"5.4 W","reference code acc. to IEC 81346-2":"Q","With Type Of Coordination 1 Required":"fuse gL/gG: 63 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":"4","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":"4","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","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","number of NC contacts for auxiliary contacts instantaneous contact":"0","number of NO contacts for auxiliary contacts instantaneous contact":"0","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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=338309&mlfb=3RT1325-1BB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1325-1BB40/alternatives.json"},"ai":{"faq":[{"question":"What is 3RT1325-1BB40's motor power rating at 400 V?","answer":"It is rated for 7.5 kW at AC-2 duty at 400 V, which covers slip-ring motor switching."},{"question":"What compliance documentation does Siemens provide for 3RT1325-1BB40?","answer":"RoHS compliance is documented from July 1, 2006. The part also carries pollution degree 3 rating for industrial environments."},{"question":"Where can I buy 3RT1325-1BB40 and how is it quoted?","answer":"It is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1325-1BB40","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/3RT1325-1BB40 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}}