{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2318-8XB30-1BB4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2318-8XB30-1BB4","canonicalUrl":"https://aoctrl.com/siemens/3RA2318-8XB30-1BB4","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2318-8XB30-1BB4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS reversing contactor assembly, size S00, 24 VDC coil, 7.5 kW at 400 V AC-3, screw terminals, snap-on DIN rail.","salesMarkdown":"The Siemens SIRIUS 3RA2318-8XB30-1BB4 is a reversing contactor assembly — a pre-wired pair of contactors with mechanical interlock, so one motor can run forward and reverse without external wiring. It ships with two 3RT2018-1BB42 contactors already mounted and interlocked. The 24 VDC coil keeps control voltage low-voltage for safety circuits. Size S00 means a compact footprint — 90 mm wide, 68 mm tall, 73 mm deep — and it snaps onto a 35 mm DIN rail or screws directly to a backplate. At 480 V it's rated 14 A; at 600 V, 11 A. Coil is screw-type terminals, same as the main circuit. Wire range accepts 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm² solid or stranded — covers standard panel wiring without adapters. For reversing duty where the contactor cycles direction under load, the AC-3 maximum switching rate is 750 operations per hour. The 90 mm width matches the S00 contactor footprint, so it fits alongside other SIRIUS components in a uniform row. Clearance: 6 mm upwards, forwards, downwards, and to the side; 0 mm backwards (flush to the rail). The shock/vibration ratings (11.4 g at 5 ms, 7.3 g at 10 ms for both AC and DC) confirm it's suitable for machine-mounted applications with moderate vibration.","metaTitle":"Siemens 3RA2318-8XB30-1BB4 SIRIUS Reversing Contactor Assemb","metaDescription":"Siemens SIRIUS 3RA2318-8XB30-1BB4 reversing contactor assembly, size S00, 24 VDC coil, 7.5 kW at 400 V AC-3. Screw terminals, snap-on DIN rail. Current lifecycle stage. Sourced to","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","at AC-3 maximum":"750 1/h","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail","at AC-3e maximum":"750 1/h","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":"24 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":"3RT2018-1BB42","2 Of The Supplied Contactor":"3RT2018-1BB42","at AC-3 rated value maximum":"690 V","at AC-3e rated value maximum":"690 V","at AC-4 at 400 V rated value":"5.5 kW","Substance Prohibitance (Date)":"10/01/2009","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","At Contactor For Auxiliary Contacts":"Screw-type terminals","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)","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), 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 %","protocol is supported AS-Interface protocol":"No","with high demand rate according to SN 31920":"75 %","Type Of Voltage Of The Control Supply Voltage":"DC","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":"$106.68","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=332058&mlfb=3RA2318-8XB30-1BB4","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RA2318-8XB30-1BB4/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 3RA2318-8XB30-1BB4?","answer":"The 3RT6026-1BM40 is a similar SIRIUS reversing contactor assembly, but it is a different size and rating — it will not drop into a panel wired for the S00 footprint without rewiring. The 3RA2318-8XB30-1BB4 is the S00 size; the 3RT6026-1BM40 is a larger frame. Stick with the same order code for a direct swap."},{"question":"What is the depth of 3RA2318-8XB30-1BB4?","answer":"The depth is 73 mm. Combined with the 90 mm width and 68 mm height, it fits standard S00 contactor panel cutouts."},{"question":"What wire sizes does the 3RA2318-8XB30-1BB4 accept?","answer":"The screw terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm² solid or stranded conductors."},{"question":"Will 3RA2318-8XB30-1BB4 drop into a panel specified around 3RT6026-1BM40?","answer":"No — the 3RA2318-8XB30-1BB4 is size S00, while the 3RT6026-1BM40 is a larger frame. The mounting hole pattern, DIN rail footprint, and terminal spacing differ. A panel designed for the 3RT6026-1BM40 would require rewiring and possibly a different backplate to accommodate the smaller S00 assembly."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2318-8XB30-1BB4","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/3RA2318-8XB30-1BB4 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}}