{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2446-8XH32-1NB3","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2446-8XH32-1NB3","canonicalUrl":"https://aoctrl.com/siemens/3RA2446-8XH32-1NB3","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2446-8XH32-1NB3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2446-8XH32-1NB3 star-delta contactor assembly, Size S3, 90 kW at 400 V AC-3, 132 kW at 690 V AC-3, screw-type terminals, DIN rail mount.","salesMarkdown":"The 3RA2446-8XH32-1NB3 is a pre-assembled SIRIUS star-delta (wye-delta) contactor assembly from Siemens, Size S3, designed to reduce inrush current during motor start by connecting the windings in star, then switching to delta for run. It ships with three contactors already matched: two 3RT2046-1NB30 (one with surge suppressor 3RT2046-1NB30-0CC0) and one 3RT2037-1NB30, plus the RS assembly kit 3RA2943-2C — no separate ordering or coordination needed. Rated 90 kW at 400 V AC-3 and 132 kW at 690 V AC-3, with a maximum AC-3 switching voltage of 690 V. The mechanical life of the contactor typical is 10 million operations. Dimensions: 220 mm wide, 180 mm high, 244 mm deep. The depth is the critical dimension for enclosure depth clearance — 244 mm means it will not fit a shallow 200 mm enclosure without a door offset. The 60 °C ceiling is standard for industrial panels without active cooling; above that, derating applies. ## Wiring and protection requirements Main current circuit and auxiliary/control circuit both use screw-type terminals. The coil connection also uses screw terminals. For Type 2 coordination (no damage to the contactor under short circuit), the required upstream fuse is 160 A — gG NH 3NA, DIAZED 5SB, or NEOZED 5SE. This is the fuse the panel builder needs on the BOM. The surge suppressor is built in with a varistor design — no external RC snubber needed for coil suppression on DC control. ## Sourcing and lifecycle — current production, quoted to order Sourced through authorized distribution channels. No stock-holding claim — each order is confirmed individually. RoHS compliance date is 03/01/2017 — the assembly meets the EU RoHS substance restrictions as of that date.","metaTitle":"Siemens 3RA2446-8XH32-1NB3 SIRIUS Star-Delta Starter","metaDescription":"Siemens 3RA2446-8XH32-1NB3 SIRIUS star-delta contactor assembly. Rated 90 kW at 400 V AC-3, 132 kW at 690 V. Current production. Quoted to order against BOM.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["Motor Starters"],"specifications":{"Depth":"244 mm","Width":"220 mm","at AC":"10.6 g / 5 ms, 6.3 g / 10 ms","at DC":"20 ... 33 V","title":"3RA2446-8XH32-1NB3","Height":"180 mm","Upwards":"10 mm","Forwards":"10 mm","at 50 Hz":"0.95","at 60 Hz":"0.95","Backwards":"0 mm","Downwards":"10 mm","At The Side":"10 mm","description":"Contactor assembly for star-delta (wye-delta) start with AS-i, AC-3, 90 kW/400 V 20-33 V AC/DC Size S3, screw terminal electrical and mechanical interlock 3 NO+3 NC, integrated varistor","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-type terminals","at AC-3 maximum":"850 1/h","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail","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":"S3","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Contactor assembly for star-delta (wye-delta) start","Of Contactor Typical":"10 000 000","at 400 V rated value":"90 kW","at 690 V rated value":"132 kW","Instantaneous Contact":"3","For Main Current Circuit":"screw-type terminals","1 Of The Supplied Contactor":"3RT2046-1NB30-0CC0","2 Of The Supplied Contactor":"3RT2046-1NB30","3 Of The Supplied Contactor":"3RT2037-1NB30","at AC-3 rated value maximum":"690 V","Substance Prohibitance (Date)":"03/01/2017","Design Of The Surge Suppressor":"with varistor","of the supplied RS assembly kit":"3RA2943-2C","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"No","Product Function Bus Communication":"No","With Type Of Assignment 2 Required":"gG NH 3NA, DIAZED 5SB, NEOZED 5SE: 160 A","closing power of magnet coil at DC":"154 W","holding power of magnet coil at DC":"5.6 W","At Contactor For Auxiliary Contacts":"Screw-type terminals","With Type Of Coordination 1 Required":"gG NH 3NA, DIAZED 5SB, NEOZED 5SE: 250 A","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"0","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 error per 100 million operating cycles","with low demand rate according to SN 31920":"40 %","Finely Stranded Without Core End Processing":"2x (10 ... 35 mm²), 1x (10 ... 50 mm²)","protocol is supported AS-Interface protocol":"Yes","with high demand rate according to SN 31920":"73 %","Type Of Voltage Of The Control Supply Voltage":"AC/DC","Of The Supplied Function Module For Communication":"3RA2712-1CA00","contact rating of auxiliary contacts according to UL":"A600 / Q600","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","product function control circuit interface with IO link":"No","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gG: 10 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/33ae11d2d55ef99cb1c8d23813bb30f6.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629729&mlfb=3RA2446-8XH32-1NB3"},"ai":{"faq":[{"question":"What is the maximum switching rate for this star-delta starter?","answer":"The maximum switching rate at AC-3 duty is 850 operations per hour. This is the thermal limit of the contactor assembly under motor starting conditions."},{"question":"What fuse rating is required for Type 2 coordination?","answer":"For Type 2 coordination, the required upstream fuse is 160 A, available as gG NH 3NA, DIAZED 5SB, or NEOZED 5SE types."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2446-8XH32-1NB3","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/3RA2446-8XH32-1NB3 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T00:35:33.501Z","lastPublished":"2026-07-21T00:35:33.501Z","indexable":true}}