{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-1JA38-1KT0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-1JA38-1KT0","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-1JA38-1KT0","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1JA38-1KT0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker, 3RV1421-1JA38-1KT0, for transformer protection, 10 A rated continuous current, CLASS 10 trip class, 100 kA breaking capacity at 400 V AC, screw and snap-on DIN rail mount.","salesMarkdown":"The Siemens 3RV1421-1JA38-1KT0 is a SIRIUS-branded circuit breaker specifically designed for transformer protection. This is a compact unit at 45 mm wide, 97 mm tall, and 96 mm deep — it fits neatly on a 35 mm DIN rail per EN 50022, using either screws or the snap-on mechanism. At 240 V and 400 V AC it's rated for 100 kA — that's a very high fault-current capability, typical for a motor-protective device that sits close to a transformer or a high-capacity bus. At 500 V AC that drops to 42 kA, and at 690 V AC it's 6 kA. ## Duty cycle and thermal performance Rated for AC-3 switching duty at up to 690 V, the breaker is good for 15 operations per hour maximum. That's fine for transformer primary protection or infrequent motor switching, but not for a high-cycling application like a rapid-start conveyor. The main contacts are rated for 100,000 mechanical operations typical, and the power dissipation in a hot state runs 9.25 W — something to account for in a crowded enclosure. ## Environmental and mounting conditions The screw terminals for the main circuit accept 2x 0.25 to 2.5 mm² solid or stranded, or 2x 24 to 14 AWG. Auxiliary switch is present and transverse design, but there are zero auxiliary contacts on the main switch itself.","metaTitle":"Siemens 3RV1421-1JA38-1KT0 SIRIUS Circuit Breaker, 10 A, CLA","metaDescription":"Siemens 3RV1421-1JA38-1KT0 SIRIUS circuit breaker for transformer protection. 10 A continuous, CLASS 10 trip, 100 kA breaking at 400 V. DIN rail mount. Current lifecycle stage. Ava","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":"10 A","Design of the product":"for transformer 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=301181&mlfb=3RV1421-1JA38-1KT0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1JA38-1KT0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RV1421-1JA38-1KT0 and how do I get a price?","answer":"This part is sourced and quoted to order through our industrial distribution channel. Submit an RFQ; we confirm availability and current pricing at quote time."},{"question":"What is 3RV1421-1JA38-1KT0's listed depth?","answer":"The depth is 96 mm. Combined with a width of 45 mm and height of 97 mm, it's a compact unit for DIN-rail mounting."},{"question":"What is 3RV1421-1JA38-1KT0's listed solid conductor capacity?","answer":"The main circuit screw terminals accept 2x solid conductors from 0.25 to 2.5 mm², or 2x 24 to 14 AWG."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-1JA38-1KT0","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/3RV1421-1JA38-1KT0 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}}