{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1325-1BF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1325-1BF40","canonicalUrl":"https://aoctrl.com/siemens/3RT1325-1BF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1325-1BF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S0, 4 NO main contacts, 110 V DC coil, screw terminals, 7.5 kW at AC-2 400 V, IP20 front, DIN rail mount.","salesMarkdown":"It carries four normally-open main contacts and a 110 V DC coil — a straight-forward fit for a 24 VDC or 48 VDC control bus with a DC-DC converter stepping up to 110 V, or a dedicated 110 VDC supply. Rated for 7.5 kW at AC-2 duty on a 400 V three-phase line, it handles slip-ring motor starting and reversing, where the load current stays high during the transition. The AC-12 rating of 10 A covers resistive and lightly inductive control loads on the main poles. The coil draws 5.4 W both on pick-up and hold — a DC economizer is built into the design, so the holding power doesn't drop. That simplifies the control transformer sizing: a 110 VDC supply rated for 5.4 W continuous per contactor is enough. The S0 footprint — 61 mm wide, 85 mm tall, 101 mm deep — leaves room for side-by-side mounting without derating, as the datasheet confirms side-by-side is permitted. Screw-type terminals on both the main and auxiliary circuits. The main terminals accept 2x (1 to 2.5 mm²) solid/stranded or up to 2x 10 mm² finely stranded with ferrule; the control circuit takes 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²). AWG equivalents are 2x (20 to 16) for control, 2x (18 to 14) or 1x 12 for the mains. Type 1 coordination (contactor may need replacement after a fault) allows a 63 A gL/gG fuse. The pollution degree is 3, meaning the contactor is rated for conductive pollution typical in industrial enclosures. RoHS compliance date is 01 July 2006, covering the EU RoHS 1 directive.","metaTitle":"Siemens 3RT1325-1BF40 SIRIUS Power Contactor, 110 V DC, 4 NO","metaDescription":"Siemens SIRIUS 3RT1325-1BF40 power contactor, size S0, 4 NO main contacts, 110 V DC coil, 7.5 kW at AC-2 400 V. IP20 front, screw terminals, DIN rail mount. Active production, sour","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":"110 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":"$518.78","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=280727&mlfb=3RT1325-1BF40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1325-1BF40/alternatives.json"},"ai":{"faq":[{"question":"What is the coil voltage and power draw for 3RT1325-1BF40?","answer":"The coil is rated 110 V DC and draws 5.4 W both on closing and holding, so no economizer circuit is needed in the control transformer sizing."},{"question":"What motor power can 3RT1325-1BF40 switch at 400 V?","answer":"At AC-2 duty on a 400 V line, it is rated for 7.5 kW — suitable for slip-ring motor starting and reversing applications."},{"question":"What are the main contact configuration and ratings?","answer":"Four normally-open main contacts. The AC-12 resistive load rating is 10 A; at AC-2 400 V it carries 7.5 kW."},{"question":"Where can I buy 3RT1325-1BF40 and how is it quoted?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What compliance documentation does Siemens provide for 3RT1325-1BF40?","answer":"RoHS compliance dated 01 July 2006 (EU RoHS 1). The product carries the IEC 81346-2 reference code Q for switching devices. Full declarations are available from Siemens on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1325-1BF40","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/3RT1325-1BF40 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}}