{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2318-8XB30-2AH0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2318-8XB30-2AH0","canonicalUrl":"https://aoctrl.com/siemens/3RA2318-8XB30-2AH0","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2318-8XB30-2AH0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2318-8XB30-2AH0 reversing contactor assembly, size S00, 7.5 kW at 400 V AC-3, spring-loaded terminals, 35 mm DIN rail mount.","salesMarkdown":"## Motor power and current ratings across common voltages The 3RA2318-8XB30-2AH0: At 480 V the rated current is 14 A; at 600 V it drops to 11 A — the current derates as voltage rises above 480 V, which matters when sizing upstream protection for a 480 V or 600 V panel. For AC-4 duty (plugging, inching) at 400 V the rating is 5.5 kW — expect roughly 25 % less power capability under severe switching conditions compared to AC-3. ## Mounting, size, and terminal details Size S00 frame — the smallest SIRIUS contactor frame, 84 mm high, 90 mm wide, 83 mm deep, fitting compact panel layouts. Main current circuit uses spring-loaded terminals; the magnet coil also uses spring-type terminals — no screw tightening needed, which speeds wiring and reduces torque-verification steps. ## Supplied contactors and mechanical life The assembly ships with two 3RT2018-2AH02 contactors — one for forward, one for reverse — mechanically interlocked to prevent simultaneous closure. Mechanical life is 10,000,000 operating cycles typical — suitable for high-cycle reversing applications like conveyors, hoists, or door drives where frequent direction changes are expected. ## Environmental and compliance notes Operates in ambient temperatures from -25 °C to +60 °C; storage range is -55 °C to +80 °C — covers most indoor industrial environments without derating at the low end. Shock resistance: 11.4 g for 5 ms and 7.3 g for 10 ms on both AC and DC supplies — rated for installations near vibrating machinery or on mobile equipment.","metaTitle":"Siemens 3RA2318-8XB30-2AH0 SIRIUS Reversing Contactor","metaDescription":"Siemens 3RA2318-8XB30-2AH0 SIRIUS reversing contactor assembly, size S00, 7.5 kW at 400 V AC-3. Spring-loaded terminals, 35 mm DIN rail mount.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Starters"],"specifications":{"Depth":"83 mm","Solid":"2x (0.5 ... 4 mm²)","Width":"90 mm","at AC":"11,4g / 5 ms, 7,3g / 10 ms","at DC":"11,4g / 5 ms, 7,3g / 10 ms","title":"3RA2318-8XB30-2AH0","Height":"84 mm","Upwards":"6 mm","Forwards":"6 mm","at 50 Hz":"0.28","at 60 Hz":"0.85 ... 1.1","Backwards":"0 mm","Downwards":"6 mm","At The Side":"6 mm","description":"reversing contactor assembly, AC-3e/AC-3, 16 A, 7.5 kW / 400 V, 3-pole, 48 V AC, 50/60 Hz, spring-loaded terminal, electrical and mechanical interlock","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Spring-type terminals","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting 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":"S00","Solid Or Stranded":"2x (0.5 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Reversing contactor assembly","Of Contactor Typical":"10 000 000","at 400 V rated value":"7.5 kW","at 480 V rated value":"14 A","at 50 Hz rated value":"48 V","at 500 V rated value":"7.5 kW","at 60 Hz rated value":"48 V","at 600 V rated value":"11 A","at 690 V rated value":"7.5 kW","For Main Current Circuit":"spring-loaded terminals","at 200/208 V rated value":"3 hp","at 220/230 V rated value":"5 hp","at 460/480 V rated value":"10 hp","at 575/600 V rated value":"10 hp","1 Of The Supplied Contactor":"3RT2018-2AH02","2 Of The Supplied Contactor":"3RT2018-2AH02","at AC-4 at 400 V rated value":"5.5 kW","Substance Prohibitance (Date)":"10/01/2009","at AWG cables for main contacts":"1x (20 ... 12)","of the supplied RH assembly kit":"3RA2913-2AA2","For Auxiliary And Control Circuit":"spring-loaded terminals","Product Extension Auxiliary Switch":"Yes","Product Function Bus Communication":"Yes","With Type Of Assignment 2 Required":"gG NH 3NA, DIAZED 5SB, NEOZED 5SE: 25 A","At Contactor For Auxiliary Contacts":"Spring-type terminals","operating frequency at AC-3 maximum":"750 1/h","With Type Of Coordination 1 Required":"gG NH 3NA, DIAZED 5SB, NEOZED 5SE: 50 A","at AWG cables for auxiliary contacts":"2x (20 ... 14)","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 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 (0.5 ... 1.5 mm²)","protocol is supported AS-Interface protocol":"No","with high demand rate according to SN 31920":"75 %","Type Of Voltage Of The Control Supply Voltage":"AC","operating voltage at AC-3 rated value maximum":"690 V","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/4b3c15de5641bd7c1e0ccec77b06486e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=535170&mlfb=3RA2318-8XB30-2AH0"},"ai":{"faq":[{"question":"What is the closest functional second-source for 3RA2318-8XB30-2AH0?","answer":"The 3RA2318-8XB30-2AH0 is a reversing contactor assembly; the peer MPNs listed (6ES7214-1BG40-0XB0, 6ED1052-1MD08-0BA1, 6AG1052-2FB08-7BA1) are PLC and logic-module order codes, not motor starters — they are not functional substitutes. For a replacement, stick with the Siemens SIRIUS 3RA2 series."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2318-8XB30-2AH0","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/3RA2318-8XB30-2AH0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}