{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK1323-2AS51-1AA3","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK1323-2AS51-1AA3","canonicalUrl":"https://aoctrl.com/siemens/3RK1323-2AS51-1AA3","factsUrl":"https://aoctrl.com/api/mcp/products/3RK1323-2AS51-1AA3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens ECOFAST reversing starter 3RK1323-2AS51-1AA3, AC-3 rated 4 kW at 400 V, AS-Interface bus, integrated brake output, IP65 enclosure, tab terminals.","salesMarkdown":"The Siemens 3RK1323-2AS51-1AA3 is an ECOFAST reversing starter — a compact, IP65-rated motor starter designed for decentralized installation in AS-Interface networks. It handles reversing motor loads up to 4 kW at AC-3 / 400 V, meaning it directly controls the forward/reverse direction of a three-phase induction motor without needing a separate contactor pair. The IP65 enclosure lets it mount directly on the machine frame or conveyor section, not just inside a control cabinet, so it suits washdown zones or outdoor conveyor lines. A 4 kW, 400 V three-phase motor draws roughly 8-9 A full-load current; the starter's rated operational current of 9 A (full-scale value) matches that closely. Motor protection uses a thermistor input (PTC) rather than a standard bimetallic overload. That means the motor winding must have a PTC thermistor embedded; if the motor has only a standard thermal model, this starter won't provide overload protection without an external relay. The brake output (400 V AC for internally supplied brakes) is built in — one less component to wire when the motor has a holding brake. Communication is via AS-Interface (AS-i), not PROFIBUS DP — confirmed by the protocol flags. That means it connects to an AS-i master/gateway, not a PROFIBUS DP network. The bus communication function is present, so status and control commands travel over the yellow AS-i flat cable. ## Deployment context This starter is built for distributed motor control — mount it on the machine frame, not in a central cabinet. The IP65 rating means the enclosure withstands hose-directed water and dust ingress, so it goes on a conveyor line in a food plant or a packaging line where washdown is routine. The 130 mm width and 250 mm height fit a typical machine-mounted junction box footprint; the 91 mm depth is shallow enough to clear guarding panels.","metaTitle":"Siemens 3RK1323-2AS51-1AA3 ECOFAST Reversing Starter, 4 kW,","metaDescription":"Siemens ECOFAST reversing starter 3RK1323-2AS51-1AA3, rated 4 kW at AC-3 / 400 V, with AS-Interface, brake output, IP65 enclosure. Current lifecycle stage active. Sourced to order","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Remote I/O & Fieldbus Modules"],"specifications":{"Depth":"91 mm","Width":"130 mm","Height":"250 mm","Maximum":"500 V","Minimum":"400 V","Initial Value":"0.3 A","Type of voltage":"DC","lifecycle_stage":"current","Full-scale value":"9 A","Type of assignment":"1","Protection class IP":"IP65","PROFIBUS DP protocol":"No","AS-interface protocol":"Yes","Design of the product":"reversing starter","Type of the motor protection":"thermistor","Design of the switching contact":"mechanical","Design of short-circuit protection":"fuse","Product function Bus communication":"Yes","Ambient temperature during operation":"-20 ... +40 °C","Product component Motor brake output":"Yes","Equipment marking acc. to DIN EN 61346-2":"Q","Operating power at AC-3 at 400 V rated value":"4 000 W","Type of electrical connection for main current circuit":"tab terminals","Maximum short-circuit current breaking capacity (Icu) at 400 V rated value":"100 kA"}},"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=49842&mlfb=3RK1323-2AS51-1AA3","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK1323-2AS51-1AA3/alternatives.json"},"ai":{"faq":[{"question":"What is the AC-3 motor power rating of 3RK1323-2AS51-1AA3?","answer":"It is rated 4 kW at AC-3 / 400 V, which covers a standard 4 kW three-phase induction motor under reversing duty."},{"question":"Does 3RK1323-2AS51-1AA3 use PROFIBUS DP or AS-Interface?","answer":"It uses AS-Interface (AS-i) protocol; PROFIBUS DP is not supported on this unit."},{"question":"What is the short-circuit breaking capacity of 3RK1323-2AS51-1AA3?","answer":"The maximum short-circuit breaking capacity (Icu) at 400 V is 100 kA, using fuse-based short-circuit protection."},{"question":"Where can I buy 3RK1323-2AS51-1AA3?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. 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/3RK1323-2AS51-1AA3","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/3RK1323-2AS51-1AA3 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}}