{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-1AA38-1KT0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-1AA38-1KT0","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-1AA38-1KT0","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1AA38-1KT0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker, 3RV1421-1AA38-1KT0, for transformer protection, 1.6 A rated continuous current, 100 kA breaking capacity at 400 V AC, screw and snap-on 35 mm DIN rail mount, IP20 front.","salesMarkdown":"Rated continuous current is 1.6 A at 400 V, with a symmetrical breaking capacity of 100 kA across the full AC voltage range — 240 V, 400 V, 500 V, and 690 V — so it can safely interrupt a fault up to 100 kA without upstream cascading, provided the prospective short-circuit current at the installation point stays within that limit. Mounts via screw or snap-on onto 35 mm standard mounting rail per DIN EN 50022 — the 45 mm width and 97 mm height fit a standard 45 mm module footprint, leaving 0 mm clearance needed at the back or sides for heat dissipation, so it can be packed tightly in a multi-row enclosure. Depth is 96 mm from the rail base to the front of the terminals — account for this when laying out gland plates and door clearance; the screw-type main circuit terminals accept 2x (0.25 to 2.5 mm²) solid or 2x (24 to 14 AWG) conductors, so standard control wiring fits without adapters. ## Auxiliary contact and switching ratings An integrated auxiliary switch is transverse in design — rated 1 A at 24 V, 0.15 A at 60 V, and 0.5 A at 230 V — these are the switching capacities for the auxiliary contact, not the main circuit; use them for status feedback to a PLC or to drive a remote indicator, but stay within the voltage-specific current limits to avoid contact welding. Maximum switching frequency in AC-3 duty is 15 operations per hour — this is a protection device, not a contactor for repetitive cycling; the mechanical endurance of the main contacts is rated at 100,000 operations typical. Operating ambient temperature range is -20 to +60 °C, storage and transport range is -50 to +80 °C — the wider storage range governs handling, not running; shock resistance is 25 g for 11 ms, so it survives typical panel transit vibration.","metaTitle":"Siemens 3RV1421-1AA38-1KT0 SIRIUS Circuit Breaker, 1.6 A, 10","metaDescription":"Siemens SIRIUS 3RV1421-1AA38-1KT0 circuit breaker for transformer protection. Rated 1.6 A continuous, 100 kA breaking capacity at 400 V. Current lifecycle stage. Sourced to order a","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":"1.6 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":"100 kA","at AC at 690 V rated value":"100 kA","at AC-3 rated value maximum":"690 V","Of The Main Contacts Typical":"100 000","at AC in hot operating state":"7.25 W","Continuous current rated value":"1.6 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":"2.4 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":"1.1 ... 1.6 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=537925&mlfb=3RV1421-1AA38-1KT0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1AA38-1KT0/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of the 3RV1421-1AA38-1KT0?","answer":"The depth is 96 mm from the DIN rail base to the front of the terminals."},{"question":"What conductor sizes does the main circuit accept?","answer":"The screw-type terminals accept 2x (0.25 to 2.5 mm²) solid or 2x (24 to 14 AWG) stranded conductors."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-1AA38-1KT0","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/3RV1421-1AA38-1KT0 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}}