{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1021-4AA38-1KT1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1021-4AA38-1KT1","canonicalUrl":"https://aoctrl.com/siemens/3RV1021-4AA38-1KT1","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1021-4AA38-1KT1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV1021-4AA38-1KT1 motor protection circuit breaker, 16 A rated continuous current, Class 10 trip, 50 kA breaking capacity at 400 V AC, screw-type terminals, DIN rail mount.","salesMarkdown":"The Siemens 3RV1021-4AA38-1KT1 is a SIRIUS motor protection circuit breaker rated for 16 A continuous current, with a Class 10 trip characteristic — meaning it disconnects within 10 seconds at 7.2× the thermal setting, which is the standard for protecting standard induction motors during locked-rotor starts. Mounting position is any orientation, so it fits in tight corners or vertical bus runs. The 45 mm width means it takes one standard module slot on the rail — no surprises when you're swapping it into an existing panel. ## Terminals and wiring Main circuit uses screw-type terminals accepting 2x (0.25... 2.5 mm²) solid or 2x (24... 14 AWG) stranded. The auxiliary and control circuit uses spring-loaded terminals — so the aux contacts are quicker to land, but the power wires still get the torque-able screw clamp that panel builders prefer for motor circuits. ## Auxiliary switch and extras This variant comes with a factory-fitted transverse auxiliary switch rated 1 A at 24 V, 0.5 A at 230 V, and 0.15 A at 60 V. It also has phase failure detection — so if one phase drops out on a three-phase motor, the breaker trips before the motor cooks on single-phasing. No ground fault detection, so don't expect it to cover leakage-to-earth faults.","metaTitle":"Siemens 3RV1021-4AA38-1KT1 SIRIUS Motor Protection Circuit B","metaDescription":"Siemens SIRIUS 3RV1021-4AA38-1KT1 motor protection circuit breaker, 16 A continuous, Class 10 trip, 50 kA breaking at 400 V AC. Screw terminals, DIN rail mount. Current production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"96 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45 mm","Height":"97 mm","at 24 V":"1 A","at 60 V":"0.15 A","at 230 V":"0.5 A","Backwards":"0 mm","Trip Class":"CLASS 10","At The Side":"0 mm","Rated Value":"690 V","During Storage":"-50 ... +80 °C","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","During Transport":"-50 ... +80 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Shock Resistance":"25g / 11 ms","Mounting Position":"any","Product Brand Name":"SIRIUS","Product Designation":"circuit breaker","at 400 V rated value":"7.5 kW","Design Of The Product":"for motor protection","Ground Fault Detection":"No","Phase Failure Detection":"Yes","For Main Current Circuit":"screw-type terminals","at AC at 240 V rated value":"100 kA","at AC at 400 V rated value":"50 kA","at AC at 500 V rated value":"10 kA","at AC at 690 V rated value":"4 kA","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"9.25 W","Substance Prohibitance (Date)":"01.05.2012","Continuous Current Rated Value":"16 A","Design Of The Auxiliary Switch":"transverse","at AWG cables for main contacts":"2x (24 ... 14)","protection class IP on the front":"IP20","For Auxiliary And Control Circuit":"spring-loaded terminals","Product Extension Auxiliary Switch":"Yes","operating frequency at AC-3 maximum":"15 1/h","Surge Voltage Resistance Rated Value":"6 000 V","at AWG cables for auxiliary contacts":"2x (24 ... 14)","at AC in hot operating state per pole":"3.1 W","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Touch Protection Against Electrical Shock":"finger-safe","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","number of CO contacts for auxiliary contacts":"0","operational current at AC-3 at 400 V rated value":"16 A","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Design Of The Overcurrent Release And Short-Circuit Release":"thermomagnetic","Arrangement Of Electrical Connectors For Main Current Circuit":"front side","Product Component Removable Terminal For Auxiliary And Control Circuit":"No","Mechanical Service Life (Switching Cycles) Of The Main Contacts Typical":"100 000","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"11 ... 16 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=456431&mlfb=3RV1021-4AA38-1KT1","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1021-4AA38-1KT1/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RV1021-4AA38-1KT1?","answer":"Submit an RFQ — this part is sourced to order through independent distribution, with availability and current pricing confirmed at quote time."},{"question":"Will 3RV1021-4AA38-1KT1 drop into a panel that was specified around 3RV2021-4CA25 without rewiring?","answer":"Both are SIRIUS motor protection breakers on the same 45 mm DIN-rail footprint, so the mechanical swap is straightforward. The 3RV2021-4CA25 is a different rating tier, so verify the continuous current and breaking capacity match your motor nameplate before ordering — the footprint is the same, but the protection settings differ."},{"question":"What compliance documentation does this brand provide for 3RV1021-4AA38-1KT1 (RoHS, REACH, UL, IEC)?","answer":"The SIRIUS series carries CE marking for the European market and is designed to IEC/EN 60947 standards. RoHS compliance date is listed as May 1, 2012, meaning it meets the EU RoHS directive effective from that date. UL and CSA listings are standard for the SIRIUS family but should be confirmed against the specific variant on the nameplate."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1021-4AA38-1KT1","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/3RV1021-4AA38-1KT1 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}}