{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1025-1BB44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1025-1BB44","canonicalUrl":"https://aoctrl.com/siemens/3RT1025-1BB44","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1BB44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1025-1BB44 power contactor, S0 frame, 24 VDC coil, screw-type terminals, DIN rail mount, IP20 front.","salesMarkdown":"That means you can pull the old unit off the rail, land the wires on the same terminals with a screwdriver, and be back in business — no crimping ferrules needed unless your site standard calls for them. The terminal area itself is IP00 — that's typical for contactors; the enclosure provides the real ingress protection. ## Coil and contact ratings — the numbers that decide fit Coil is a 24 VDC pickup, pulling 5.4 W during both closing and holding. Holding power equals inrush. On the main contacts, the AC-3 motor-switching rating at 400 V is 7.5 kW — that is the number most buyers care about for a standard three-phase induction motor. The AC-4 reversing or plugging rating at 400 V is 15.5 A, lower than the AC-3 rating because of the higher switching stress. For resistive loads (AC-1), the maximum operational current is 10 A at 400 V. The contactor also carries ratings at other voltages: at 230 V it switches 6 A, at 500 V it switches 10 kW, and at 690 V it switches 11 kW. These are for the main circuit under the respective duty classes — match the voltage on your line. Auxiliary contact ratings are given for the DC switching side: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V. That is important if you are using the aux contacts to switch a PLC input or a smaller relay coil — the DC rating drops fast as voltage rises. ## Installation constraints and wiring details The S0 frame measures 45 mm wide by 85 mm tall by 150 mm deep. Main circuit terminals accept solid or stranded wire: 2x (1... 2.5 mm²), 2x (2.5... 6 mm²), or a single up to 10 mm². Auxiliary circuit terminals take 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), or a single up to 4 mm². AWG equivalents are also listed: main terminals take 2x (16... 12), 2x (14... 10), or 1x 8 AWG; aux terminals take 2x (20... 16), 2x (18... 14), or 1x 12 AWG. ## Short-circuit protection coordination These are the values to hand to the panel builder when sizing the branch circuit protection. ## Mechanical life and compliance The typical mechanical endurance is 10 million operations — that is the unloaded mechanical life. Electrical life will be lower and depends on the switching current and voltage; the 10 million figure is a reference for how many times the armature can cycle before mechanical wear becomes a concern. The product carries a substance prohibition date of 01.07.2006, which aligns with the original EU RoHS directive (RoHS 1). This means the contactor is RoHS-compliant for the six original restricted substances.","metaTitle":"Siemens 3RT1025-1BB44 SIRIUS Power Contactor, 24 VDC Coil, S","metaDescription":"Siemens 3RT1025-1BB44 SIRIUS power contactor, S0 size, 24 VDC coil, screw terminals, DIN rail mount. Current production. Sourced to order. RFQ for pricing.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"150 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)","Width":"45 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","at 500 V rated value":"10 kW","at 690 V rated value":"11 kW","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"7.5 kW","at AC-4 at 400 V rated value":"15.5 A","Substance Prohibitance (Date)":"01.07.2006 00:00:00","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 10), 1x 8","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":"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","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":"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":"$91.44","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=364481&mlfb=3RT1025-1BB44","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1BB44/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of the 3RT1025-1BB44?","answer":"The depth is 150 mm. That is the dimension from the DIN rail mounting surface to the farthest forward point — important for enclosure depth clearance."},{"question":"What wire sizes can I terminate on the 3RT1025-1BB44?","answer":"Main circuit terminals accept 2x (1... 2.5 mm²), 2x (2.5... 6 mm²), or max. 1x 10 mm² solid/stranded. Auxiliary circuit terminals accept 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), or max. 1x 4 mm². AWG equivalents: main 2x (16-12), 2x (14-10), 1x 8; aux 2x (20-16), 2x (18-14), 1x 12."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1025-1BB44","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/3RT1025-1BB44 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}}