{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4AA10-0RT0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4AA10-0RT0","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4AA10-0RT0","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4AA10-0RT0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV2 motor protection circuit breaker, Size S0, 3RV2021-4AA10-0RT0, 25 kA rated breaking capacity at 400 V AC, Class 10 trip, screw terminals, 45 mm wide.","salesMarkdown":"## Size S0 motor protection breaker — 25 kA at 400 V, Class 10 The Siemens 3RV2021-4AA10-0RT0 is a Size S0 motor protection circuit breaker from the SIRUS 3RV2 family, designed for screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715. Rated breaking capacity hits 25 kA at 400 V AC (55 kA at 400 V AC for the main circuit) and 100 kA at 240 V AC, giving solid SCCR headroom for most industrial motor branch circuits without cascading upstream. The Class 10 trip characteristic matches standard IEC motor starting profiles — it holds through the inrush and clears on a locked-rotor fault without nuisance tripping. Motor power rating is 4 kW at 230 V, with a maximum AC-3 operating voltage of 690 V. The gG fuse backup ratings are 63 A at 400 V, 50 A at 500 V, and 40 A at 690 V — coordination data for selective coordination studies. Mechanical endurance is listed at 100 000 typical cycles for the main contacts. The 25 kA at 400 V rated breaking capacity and 55 kA at 400 V for the main current circuit mean this breaker can safely interrupt high fault currents in a 400 V distribution panel — typical for European 400 V three-phase motor branch circuits. These figures are the SCCR the breaker contributes to the panel assembly; coordination with upstream fuses or breakers uses the gG backup ratings provided. Trip Class 10 means the breaker's thermal overload element allows a motor to draw locked-rotor current for up to 10 seconds before tripping — enough for most standard induction motor starts, but not for high-inertia loads that need Class 20 or Class 30. The 15 1/h maximum switching rate at AC-3 duty matches typical process cycling, not high-speed jogging. No ground fault or phase failure detection built in — this is a basic motor protection breaker for overload and short-circuit only. If phase loss or ground fault protection is required, add an external relay or specify a variant with those functions. For panel builders or MRO planners, the screw-type main circuit terminals accept 2x (1 to 2.5 mm²) or 2x (2.5 to 10 mm²) solid or stranded copper — covers most motor feeder sizes up to 4 kW at 230 V. The M4 main contact screws and Pozidriv size 2 screwdriver tip are standard panel tools. ## Integration notes The 45 mm width occupies one standard 45 mm module slot. Clearance requirements: 50 mm upwards, 50 mm downwards, 30 mm at the sides, zero forwards and backwards. The breaker is designed for any mounting position, so it can be installed horizontally or vertically in tight enclosures without derating the thermal trip.","metaTitle":"Siemens 3RV2021-4AA10-0RT0 Motor Protection CB, Size S0, 25","metaDescription":"Siemens 3RV2021-4AA10-0RT0 motor protection circuit breaker, Size S0, 25 kA at 400 V, Class 10 trip, 45 mm wide. Sourced to order against RFQ. Current lifecycle stage.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"97 mm","Width":"45 mm","title":"3RV2021-4AA10-0RT0","Height":"97 mm","Upwards":"50 mm","Forwards":"0 mm","at 400 V":"gG 63 A","at 500 V":"gG 50 A","at 690 V":"gG 40 A","Backwards":"0 mm","Downwards":"50 mm","Trip Class":"CLASS 10","At The Side":"30 mm","Rated Value":"20 ... 690 V","description":"circuit breaker size S0 for system protection without phase failure protection A-release 10...16 A short-circuit release 208 A screw terminal standard switching capacity special variant for Rittal","During Storage":"-50 ... +80 °C","at AC-3 maximum":"15 1/h","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","During Transport":"-50 ... +80 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715","at AC-3e maximum":"15 1/h","For Main Contacts":"M4","Mounting Position":"any","Solid Or Stranded":"2x (1 ... 2.5 mm²), 2x (2.5 ... 10 mm²)","at 230 V rated value":"4 kW","at 400 V rated value":"25 kA","at 500 V rated value":"5 kA","at 690 V rated value":"2 kA","Ground Fault Detection":"No","Phase Failure Detection":"No","For Main Current Circuit":"screw-type terminals","at AC at 240 V rated value":"100 kA","at AC at 400 V rated value":"55 kA","at AC at 500 V rated value":"10 kA","at AC at 690 V rated value":"4 kA","Design Of Screwdriver Shaft":"Diameter 5 to 6 mm","Size Of The Circuit-Breaker":"S0","Size Of The Screwdriver Tip":"Pozidriv size 2","at AC-3 rated value maximum":"690 V","Of The Main Contacts Typical":"100 000","at AC in hot operating state":"9.25 W","at AC-3 at 400 V rated value":"16 A","at AC-3e rated value maximum":"690 V","Of Auxiliary Contacts Typical":"100 000","Substance Prohibitance (Date)":"10/01/2009","at AC-3e at 400 V rated value":"16 A","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"16 A","Design Of The Short-Circuit Trip":"magnetic","Product Extension Auxiliary Switch":"Yes","Relative Humidity During Operation":"10 ... 95 %","Display Version For Switching Status":"Handle","Surge Voltage Resistance Rated Value":"6 kV","at AC in hot operating state per pole":"3.1 W","With Side-By-Side Mounting At The Side":"0 mm","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²), 1x 10 mm²","Number Of Poles For Main Current Circuit":"3","Product Function Short Circuit Protection":"Yes","with low demand rate according to SN 31920":"50 FIT","For Main Contacts With Screw-Type Terminals":"2 ... 2.5 N·m","with high demand rate according to SN 31920":"50 %","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"0","shock resistance according to IEC 60068-2-27":"25g / 11 ms Sinus","Electrical Endurance (Operating Cycles) Typical":"100 000","Size Of Contactor Can Be Combined Company-Specific":"S00, S0","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Arrangement Of Electrical Connectors For Main Current Circuit":"Top and bottom","Response Value Current Of Instantaneous Short-Circuit Trip Unit":"208 A","insulation voltage with degree of pollution 3 at AC rated value":"690 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/69e3aae776a3a972c11948ccacc118a3.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1538646&mlfb=3RV2021-4AA10-0RT0"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RV2021-4AA10-0RT0?","answer":"Submit an RFQ through this listing. Pricing and stock are confirmed at quote time — no published figures are available here, but the part is sourced to order through independent distribution."},{"question":"Will 3RV2021-4AA10-0RT0 drop into a panel specified around 3RV2023-4CA10 without rewiring?","answer":"The 3RV2021-4AA10-0RT0 shares the Size S0 frame and 45 mm width with the 3RV2023-4CA10, so it fits the same DIN rail footprint and panel cutout. However, the 3RV2023-4CA10 has a higher current rating (typically 32-40 A range) and different trip settings — verify the motor FLA and coordination study before substituting, as the 3RV2021 is a lower-current variant."},{"question":"What compliance documentation does this brand provide for 3RV2021-4AA10-0RT0?","answer":"Siemens SIRIUS 3RV2 breakers carry IEC/EN 60947-2 and 60947-4-1 certification for motor protection. The 3RV2021-4AA10-0RT0 is designed for global markets with CE marking; UL/CSA listings are typically available for the 3RV2 family but confirm the specific variant for your jurisdiction. RoHS and REACH declarations are standard from Siemens documentation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4AA10-0RT0","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/3RV2021-4AA10-0RT0 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}}