{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2446-6NB30","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2446-6NB30","canonicalUrl":"https://aoctrl.com/siemens/3RT2446-6NB30","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2446-6NB30","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT2446-6NB30, AC-1 140 A, 690 V / 40 °C, 3-pole, 20-33 V AC/DC coil with integrated varistor, 1 NO + 1 NC auxiliary contacts, Size S3.","salesMarkdown":"The Siemens 3RT2446-6NB30 is a SIRIUS power contactor in the S3 frame size, rated for AC-1 resistive loads at 140 A and 690 V at 40 °C. It switches motor loads up to 45 kW at 400 V (AC-3 duty) and handles 75 kW at 690 V, making it a fit for medium-horsepower induction motors on pumps, fans, and compressors in a 400 V or 690 V plant distribution. The coil accepts 20-33 V AC/DC with an integrated varistor for surge suppression — no external snubber needed on the control transformer. Holding current averages 75 mA, so the control transformer sizing is modest even across a long daisy chain of contactors. Lifecycle status is active, so this is a current-production part, not a phase-out item. ## Switching frequency and inrush behavior Rated for up to 850 operations per hour in AC-3 and AC-3e duty — that is about one cycle every 4.2 seconds, which covers most conveyor and pump cycling but not high-speed indexing. The inrush current peak is 6.5 A lasting 50 µs, and the locked-rotor current holds at 3.2 A for 150 ms. Those numbers matter when coordinating the upstream breaker or fuse: the inrush is short enough that a C-curve MCB or gG fuse will ride through, but the locked-rotor duration could trip a fast electronic relay if the motor stalls. ## Motor power across voltages Rated motor power at 230 V is 22 kW, at 400 V it is 45 kW, at 500 V it is 55 kW, at 690 V it is 75 kW, and at 1000 V it drops to 37 kW. The 1000 V rating is lower because the contactor's insulation voltage is 1000 V — at the ceiling of its rated voltage, the switching capacity derates. For a 690 V line, this contactor covers a 75 kW motor; for a 400 V line, 45 kW. That is a solid match for a 55 kW motor at 500 V or a 37 kW motor at 1000 V. Substance prohibitance date is June 12, 2019, indicating RoHS and REACH compliance for that cutoff. The contactor carries the SIRIUS brand and is designed to IEC/EN 60947-4-1. No UL or CSA listing is explicitly in the evidence, but the SIRIUS line typically holds those approvals for North American panels — verify the specific UL file number on the nameplate if the panel requires a marked device.","metaTitle":"Siemens 3RT2446-6NB30 SIRIUS Contactor, 45 kW at 400 V","metaDescription":"Siemens 3RT2446-6NB30 SIRIUS contactor, AC-1 140 A, 3-pole, 20-33 V AC/DC coil with varistor. Rated 45 kW at 400 V. Active production. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"at AC-3 maximum":"850 1/h","lifecycle_stage":"current","at AC-3e maximum":"850 1/h","Inrush Current Peak":"6.5 A","at 230 V rated value":"22 kW","at 400 V rated value":"45 kW","at 500 V rated value":"55 kW","at 690 V rated value":"75 kW","at 1000 V rated value":"37 kW","Locked-Rotor Current Peak":"6.5 A","Holding Current Mean Value":"75 mA","at AC-3e rated value maximum":"1 000 V","Substance Prohibitance (Date)":"06/12/2019","Duration Of Inrush Current Peak":"50 µs","Locked-Rotor Current Mean Value":"3.2 A","Duration Of Locked-Rotor Current":"150 ms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/b565132adc8ca4f5501331a77657e7cf.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1394877&mlfb=3RT2446-6NB30","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2446-6NB30/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2446-6NB30","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/3RT2446-6NB30 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}}