{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2120-0KA23-0AP6","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2120-0KA23-0AP6","canonicalUrl":"https://aoctrl.com/siemens/3RA2120-0KA23-0AP6","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2120-0KA23-0AP6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2120-0KA23-0AP6 non-fused motor starter, direct starter design, size S0, 690 V rated, CLASS 10 thermal overload, 370 W at 400 V, supplied with 3RT2023-1AP60 contactor and link module.","salesMarkdown":"## What this starter does in a panel The 3RA2120-0KA23-0AP6: This is a non-fused motor starter from the Siemens SIRIUS family, built as a direct starter — meaning it combines a contactor and a thermal overload relay in one assembly, ready to snap onto a DIN rail or screw-mount with the included push-in lug. The supplied contactor is a 3RT2023-1AP60, and the link module 3RA2921-1AA00 ties the contactor to the overload block — no extra wiring between them, which saves panel space and cuts down on termination errors. ## Rated voltage and motor power — what it handles Rated at 690 V, with an AC-3 maximum of 690 V, this starter covers common three-phase systems at 400 V, 480 V, 500 V, and 600 V without derating the voltage class. Motor power ratings are 370 W at 400 V, 550 W at 500 V, and 750 W at 690 V — so it's sized for small motors, fractional-horsepower loads like pumps, fans, and conveyors in a control panel. The control coil accepts 176–242 V at 50 Hz and 192–264 V at 60 Hz, which means it works on standard 230 V control transformers in most regions. ## Trip class and overload protection The overload release is thermal bimetallic, CLASS 10 — that's the standard trip class for standard-duty motors, giving enough time for the motor to start without tripping, but fast enough to protect against sustained overloads. Because it's thermal, it doesn't need an external power supply for the overload function — it responds to motor current heating the bimetal strip, which is simple and field-proven. ## Mounting and panel fit Snap-mounted to DIN rail or screw-mounted with an additional push-in lug — the mounting position is vertical, and the clearances are 30 mm upwards, 10 mm forwards, 10 mm downwards, and 9 mm at the side. Dimensions are 97.1 mm deep, 45 mm wide, and 193.1 mm high — the S0 size load feeder footprint is compact enough for a crowded panel but leaves room for finger-safe wiring.","metaTitle":"Siemens 3RA2120-0KA23-0AP6 Motor Starter, SIRIUS, 690 V","metaDescription":"Siemens 3RA2120-0KA23-0AP6 non-fused motor starter, SIRIUS series, 690 V rated, CLASS 10 thermal overload, 370 W at 400 V. Current production, quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"97.1 mm","Width":"45 mm","title":"3RA2120-0KA23-0AP6","Height":"193.1 mm","Upwards":"30 mm","Forwards":"10 mm","Backwards":"0 mm","Downwards":"10 mm","Trip Class":"CLASS 10","At The Side":"9 mm","Rated Value":"690 V","description":"Fuseless motor starter Direct start 600VAC Size S0 0.9-1.25A 220/240VAC 50/60HZ screw connection For screw mounting Or 35 mm rail-mounting Type of coordination 2 IQ = 150 KA Also full fills type Of coordination 1 1NO+1NC (contactor)","During Storage":"-50 ... +80 °C","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","During Transport":"-55 ... +80 °C","Fastening Method":"Snap-mounted to DIN rail or screw-mounted with additional push-in lug","Mounting Position":"vertical","Product Brand Name":"SIRIUS","Type Of Assignment":"2","Degree Of Pollution":"3","Product Designation":"non-fused motor starter 3RA2","Size Of Load Feeder":"S0","at 400 V rated value":"370 W","at 480 V rated value":"1.19 A","at 50 Hz rated value":"176 ... 242 V","at 500 V rated value":"550 W","at 60 Hz rated value":"192 ... 264 V","at 600 V rated value":"1.25 A","at 690 V rated value":"750 W","Design Of The Product":"direct starter","at 460/480 V rated value":"0.5 hp","at 575/600 V rated value":"0.5 hp","Of The Supplied Contactor":"3RT2023-1AP60","For Main Contacts Stranded":"1 ... 10 mm², 2x (2.5 ... 6 mm²)","Of The Supplied Link Module":"3RA2921-1AA00","Size Of The Circuit-Breaker":"S00","at AC-3 rated value maximum":"690 V","Design Of The Overload Release":"thermal (bimetallic)","Design Of The Switching Contact":"electromechanical","Operating Frequency Rated Value":"50 ... 60 Hz","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 8)","Design Of The Short-Circuit Trip":"magnetic","Of The Supplied Circuit-Breakers":"3RV2011-0KA10","Product Extension Auxiliary Switch":"Yes","Surge Voltage Resistance Rated Value":"6 kV","Number Of Poles For Main Current Circuit":"3","Product Function Short Circuit Protection":"Yes","apparent holding power of magnet coil at AC":"7.2 VA","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","shock resistance according to IEC 60068-2-27":"6g / 11 ms","at 400 V according to IEC 60947-4-1 rated value":"153 000 A","operational current at AC-3 at 400 V rated value":"1.1 A","Type Of Electrical Connection For Main Current Circuit":"screw-type terminals","Inductive Power Factor With The Holding Power Of The Coil":"0.28","Mechanical Service Life (Switching Cycles) Of Contactor Typical":"10 000 000","Response Value Current Of Instantaneous Short-Circuit Trip Unit":"16.25 A","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"0.9 ... 1.25 A","Connectable Conductor Cross-Section For Main Contacts Finely Stranded With Core End Processing":"1 ... 6 mm²"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/698e066be88f1cdc670fb68e7392e968.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=452482&mlfb=3RA2120-0KA23-0AP6"},"ai":{"faq":[{"question":"What is 3RA2120-0KA23-0AP6 used for?","answer":"It's a non-fused direct motor starter for small three-phase motors up to 750 W at 690 V, typically used in control panels for pumps, fans, and conveyors."},{"question":"What are the key ratings for 3RA2120-0KA23-0AP6?","answer":"Rated voltage 690 V, AC-3 max 690 V, motor power 370 W at 400 V, CLASS 10 thermal overload, control voltage 176–242 V at 50 Hz."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2120-0KA23-0AP6","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/3RA2120-0KA23-0AP6 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}