{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2318-8XB30-1BW4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2318-8XB30-1BW4","canonicalUrl":"https://aoctrl.com/siemens/3RA2318-8XB30-1BW4","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2318-8XB30-1BW4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2318-8XB30-1BW4 reversing contactor assembly, S00 frame size, 7.5 kW at 400 V AC-3, 2 × 3RT2018-1BW42 contactors, screw terminals, 35 mm DIN rail.","salesMarkdown":"## Reversing contactor assembly — two contactors in one package The 3RA2318-8XB30-1BW4 is a Siemens SIRIUS reversing contactor assembly, S00 frame size, combining two 3RT2018-1BW42 contactors in a single pre-assembled unit with a mechanical interlock. The S00 contactor size keeps the footprint compact: 90 mm wide, 68 mm tall, 73 mm deep — fits standard 35 mm DIN rail panels without oversizing the enclosure. ## Termination and wiring — screw terminals throughout AWG equivalents for the main contacts are 2x (20...16) and 2x (18...14), covering typical motor feeder and control wiring in North American panels. ## Ambient limits and vibration tolerance Vibration resistance at 11.4 g for 5 ms and 7.3 g for 10 ms, same for AC and DC — the contactor holds its state through the shock profile typical of machine-mounted panels near presses or crushers. Storage range -55 °C to +80 °C covers unheated warehouses and shipping containers; the wider storage window compared to operation is normal for electromechanical devices. ## Active production — sourcing posture Supplied as a complete assembly with two 3RT2018-1BW42 contactors and the 3RA2913-2AA1 reversing interlock kit — no separate interlock sourcing needed.","metaTitle":"Siemens 3RA2318-8XB30-1BW4 Reversing Contactor Assembly, S00","metaDescription":"Siemens SIRIUS 3RA2318-8XB30-1BW4 reversing contactor assembly, 7.5 kW at 400 V, S00 size, supplied with two 3RT2018-1BW42 contactors.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Starters"],"specifications":{"Depth":"73 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 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","Height":"68 mm","Upwards":"6 mm","Forwards":"6 mm","Backwards":"0 mm","Downwards":"6 mm","At The Side":"6 mm","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-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 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","at DC rated value":"48 V","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 500 V rated value":"7.5 kW","at 600 V rated value":"11 A","at 690 V rated value":"7.5 kW","For Main Current Circuit":"screw-type 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":"3RT2018-1BW42","2 Of The Supplied Contactor":"3RT2018-1BW42","at AC-4 at 400 V rated value":"5.5 kW","Substance Prohibitance (Date)":"01.10.2009","at AWG cables for main contacts":"2x (20 ... 16), 2x (18 ... 14)","of the supplied RH assembly kit":"3RA2913-2AA1","For Auxiliary And Control Circuit":"screw-type 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","closing power of magnet coil at DC":"4 W","holding power of magnet coil at DC":"4 W","reference code acc. to IEC 81346-2":"Q","At Contactor For Auxiliary Contacts":"Screw-type terminals","operating frequency at AC-3 maximum":"1 000 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 ... 16), 2x (18 ... 14)","with low demand rate acc. to SN 31920":"40 %","with high demand rate acc. to SN 31920":"75 %","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 error per 100 million operating cycles","protocol is supported AS-Interface protocol":"No","Type Of Voltage Of The Control Supply Voltage":"DC","operating voltage at AC-3 rated value maximum":"690 V","touch protection on the front acc. to IEC 60529":"finger-safe, for vertical contact from the front","B10 value with high demand rate acc. to SN 31920":"1 000 000","protection class IP on the front acc. to IEC 60529":"IP20","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,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3000cdebca308b717a3809bd5fdcd05e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=31602&mlfb=3RA2318-8XB30-1BW4","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RA2318-8XB30-1BW4/alternatives.json"},"ai":{"faq":[{"question":"What is the motor power rating for 3RA2318-8XB30-1BW4 at 400 V?","answer":"At 480 V the current rating is 14 A, and at 600 V the power rating is 7.5 kW."},{"question":"What contactors are supplied inside the 3RA2318-8XB30-1BW4?","answer":"Two 3RT2018-1BW42 contactors, S00 size, with screw terminals. The reversing interlock kit (3RA2913-2AA1) is also included in the assembly."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2318-8XB30-1BW4","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/3RA2318-8XB30-1BW4 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}}