{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2220-4ND27-0AP0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2220-4ND27-0AP0","canonicalUrl":"https://aoctrl.com/siemens/3RA2220-4ND27-0AP0","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2220-4ND27-0AP0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2220-4ND27-0AP0 reversing starter, S0 frame, 15 kW at 400 V AC-3, Class 10 thermal bimetal overload, snap-on 60 mm busbar mount, screw terminals.","salesMarkdown":"## What snaps onto a 60 mm busbar and reverses a 15 kW motor? The 3RA2220-4ND27-0AP0 is a Siemens SIRIUS reversing starter — a factory-assembled combination of two contactors, a mechanical interlock, a thermal bimetal overload relay, and a circuit-breaker, all pre-wired on a common S0 frame that snaps directly onto a 60 mm busbar system. The supplied contactor 3RT2027-1AP00 and link module 3RA2921-1AA00 form the reversing pair with a mechanical interlock that prevents both contactors from closing simultaneously — a requirement for any reversing application where a phase-to-phase short on the motor terminals would otherwise occur. ## Busbar mounting and panel clearance — the S0 frame dimensions The unit is designed for snapping onto 60 mm busbar systems, not for DIN rail — the fastening method is a dedicated busbar adapter (supplied as 8US1251-5NT10,) that clips onto the busbar and receives the starter. Dimensions are 260 mm height, 90 mm width, and 155 mm depth. The vertical mounting position is mandatory — horizontal mounting would require derating the thermal overload because the bimetal element's trip curve shifts with orientation. Clearance requirements: 50 mm upwards, 32 mm forwards, 10 mm downwards, 10 mm at the side. Backwards clearance is 0 mm — the unit sits flush against the busbar backplane. ## Trip Class 10 and thermal bimetal overload — what it means for motor protection The overload release is thermal bimetal with a Class 10 trip characteristic. The short-circuit trip is magnetic, provided by the integrated circuit-breakers 3RV2021-4NA10 — these handle the instantaneous magnetic trip for bolted faults, while the bimetal handles overloads. The two protection functions are independent but share the same S0 frame. Operating temperature range is -20 to +60 °C with temperature compensation active across that same span — the bimetal element's trip point is corrected for ambient temperature changes, so the motor protection stays accurate whether the panel is in a cold warehouse or a warm machine room. The supplied sub-components (contactor 3RT2027-1AP00, link module 3RA2921-1AA00, busbar adapter 8US1251-5NT10, circuit-breakers 3RV2021-4NA10, and RS assembly kit 8US1250-5AT10) are all current-production Siemens catalog items — no risk of a single component going EOL and stranding the assembly.","metaTitle":"Siemens 3RA2220-4ND27-0AP0 SIRIUS Reversing Starter","metaDescription":"Siemens 3RA2220-4ND27-0AP0 SIRIUS reversing starter, 15 kW at 400 V AC-3, Class 10 trip, S0 frame, snaps onto 60 mm busbar. Active production, quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Starters"],"specifications":{"Depth":"155 mm","Width":"90 mm","title":"3RA2220-4ND27-0AP0","Height":"260 mm","Upwards":"50 mm","Forwards":"32 mm","Backwards":"0 mm","Downwards":"10 mm","Trip Class":"CLASS 10","At The Side":"10 mm","Rated Value":"690 V","description":"Load feeder fuseless, Reversing duty 400 V AC, Size S0 23.0...28.0 A 230 V AC screw terminal for 60 mm busbar systems (also fulfills type of coordination 1) Type of coordination 2, Iq = 150 kA 1 NO+1 NC (contactor)","During Storage":"-50 ... +80 °C","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","During Transport":"-50 ... +80 °C","Fastening Method":"for snapping onto 60 mm busbar systems","Mounting Position":"vertical","PROFIsafe protocol":"No","Product Brand Name":"SIRIUS","Type Of Assignment":"2","Product Designation":"Reversing starter","Size Of Load Feeder":"S0","PROFINET IO protocol":"No","at 400 V rated value":"15 000 W","at 50 Hz rated value":"230 ... 230 V","Design Of The Product":"for 60 mm busbars","For Main Current Circuit":"screw-type terminals","Temperature Compensation":"-20 ... +60 °C","Of The Supplied Contactor":"3RT2027-1AP00","Of The Supplied Link Module":"3RA2921-1AA00","Size Of The Circuit-Breaker":"S0","at AC-3 rated value maximum":"690 V","Substance Prohibitance (Date)":"10/01/2009","Design Of The Overload Release":"thermal (bimetallic)","Of The Supplied Busbar Adapter":"8US1251-5NT10","Design Of The Switching Contact":"electromechanical","Operating Frequency Rated Value":"50 ... 60 Hz","of the supplied RS assembly kit":"8US1250-5AT10","Design Of The Short-Circuit Trip":"magnetic","Of The Supplied Circuit-Breakers":"3RV2021-4NA10","degree of protection NEMA rating":"other","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","Relative Humidity During Operation":"10 ... 95 %","Surge Voltage Resistance Rated Value":"6 kV","Number Of Poles For Main Current Circuit":"3","Product Function Short Circuit Protection":"Yes","protocol is supported AS-Interface protocol":"No","shock resistance according to IEC 60068-2-27":"6g / 11 ms","Type Of Voltage Of The Control Supply Voltage":"AC","at 400 V according to IEC 60947-4-1 rated value":"150 000 A","operational current at AC-3 at 400 V rated value":"28 A","Mechanical Service Life (Switching Cycles) Of Contactor Typical":"10 000 000","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"23 ... 28 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/2d176b0716d61e85b1f0a09202b3c64f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=529625&mlfb=3RA2220-4ND27-0AP0"},"ai":{"faq":[{"question":"How is 3RA2220-4ND27-0AP0 supplied and quoted?","answer":"This reversing starter is sourced to order through independent distribution channels. It is not held in speculative stock; the supply posture is quoted-to-order."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2220-4ND27-0AP0","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/3RA2220-4ND27-0AP0 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}}