{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1021-1JA38-1KT1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1021-1JA38-1KT1","canonicalUrl":"https://aoctrl.com/siemens/3RV1021-1JA38-1KT1","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1021-1JA38-1KT1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor protection circuit breaker, 3RV1021-1JA38-1KT1, 10 A continuous rated current, CLASS 10 trip class, 100 kA breaking capacity at 400 V AC, screw and snap-on DIN rail mount.","salesMarkdown":"It provides overload and short-circuit protection for motors up to 4 kW at 400 V, with a CLASS 10 trip characteristic — meaning it trips within 10 seconds at 7.2× the set current, fast enough to protect standard induction motors during stall or locked-rotor conditions. Rated continuous current is 10 A, which sets the overload protection threshold. The breaker handles 100 kA prospective short-circuit current at 400 V AC — typical for high-fault industrial panels fed by a large transformer — and 42 kA at 500 V, dropping to 6 kA at 690 V. The 100 kA rating at 240 V AC is relevant for single-phase motor circuits or control transformers. That 100 kA SCCR means this breaker can clear a bolted fault without rupturing, even on a stiff network. Mounts via screw fixing or snaps onto 35 mm standard DIN rail per EN 50022. Footprint: 45 mm wide × 97 mm high × 96 mm deep — a standard 45 mm module width, so it fits a typical 45 mm slot in a motor control center (MCC) bucket or enclosure row. Any mounting position is allowed, which helps when panel space is tight. ## Auxiliary switch and wiring Main circuit terminals accept 2x (0.25 … 2.5 mm²) solid or stranded, or 2x AWG 24…14. The auxiliary contacts are rated at 1 A at 24 V, 0.15 A at 60 V, and 0.5 A at 230 V — sufficient for signaling to a PLC input or contactor coil. No ground-fault detection; that's a separate device. Shock rated at 25g for 11 ms — survives typical shipping and panel-door slams. Maximum operating altitude 2 000 m without derating. Mechanical endurance of main contacts typically 100 000 operations.","metaTitle":"Siemens 3RV1021-1JA38-1KT1 SIRIUS Motor Protection Circuit B","metaDescription":"Siemens 3RV1021-1JA38-1KT1 SIRIUS motor protection circuit breaker, 10 A continuous current, CLASS 10 trip, 100 kA breaking at 400 V. Active production. Quoted to order.","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","Maximum":"2 000 m","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","On The Front":"IP20","Mounting type":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","During Storage":"-50 ... +80 °C","at AC-3 maximum":"15 1/h","lifecycle_stage":"current","Auxiliary switch":"Yes","During Operation":"-20 ... +60 °C","During Transport":"-50 ... +80 °C","Shock resistance":"25g / 11 ms","Mounting position":"any","Product brand name":"SIRIUS","Product designation":"circuit breaker","at 400 V rated value":"4 kW","Design of the product":"for motor protection","For Auxiliary Contacts":"0","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":"100 kA","at AC at 500 V rated value":"42 kA","at AC at 690 V rated value":"6 kA","at AC-3 rated value maximum":"690 V","Of The Main Contacts Typical":"100 000","at AC in hot operating state":"9.25 W","Continuous current rated value":"10 A","Design of the auxiliary switch":"transverse","at AWG conductors for main contacts":"2x (24 ... 14)","Surge voltage resistance rated value":"6 000 V","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","at AWG conductors for auxiliary contacts":"2x (24 ... 14)","For Auxiliary And Control Current Circuit":"spring-loaded terminals","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","Removable Terminal For Auxiliary And Control Circuit":"No","Design of the overcurrent release and short-circuit release":"thermomagnetic","Arrangement of electrical connectors for main current circuit":"front side","Adjustable pick-up value current of the current-dependent overload release":"7 ... 10 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=304086&mlfb=3RV1021-1JA38-1KT1","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1021-1JA38-1KT1/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3RV1021-1JA38-1KT1 at 400 V?","answer":"100 kA at 400 V AC. At 500 V it is 42 kA, and at 690 V it is 6 kA. This is the rated short-circuit breaking capacity (Icu) for the motor protection circuit breaker."},{"question":"Does 3RV1021-1JA38-1KT1 include phase failure detection?","answer":"Yes, phase failure detection is built in. The breaker will trip if one phase is lost, preventing single-phase motor damage."},{"question":"Where can I buy 3RV1021-1JA38-1KT1 and what is the lead time?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for the real ETA."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1021-1JA38-1KT1","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/3RV1021-1JA38-1KT1 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}}