{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2421-1GA10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2421-1GA10","canonicalUrl":"https://aoctrl.com/siemens/3RV2421-1GA10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2421-1GA10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker, 3RV2421-1GA10, for transformer protection, 100 kA breaking capacity at 400 V, Trip Class 10, 45 mm wide, screw and snap-on 35 mm DIN rail mounting.","salesMarkdown":"## Transformer protection breaker with 100 kA interrupting capacity There is no ground fault detection, so pair this with a residual-current device if ground-fault protection is required. ## DIN-rail fit and clearance envelope That 50 mm vertical gap is the one that catches panel builders — skimp on it and you lose the arc-chamber venting path. Terminals accept 2x (1…2.5 mm²) or 2x (2.5…10 mm²) solid or stranded copper, with M4 screw-type terminals for the main circuit. ## Fuse backup coordination When the prospective fault current exceeds the breaker's interrupting capacity at your system voltage, the 3RV2421-1GA10 requires upstream gL/gG fuses: 50 A at 400 V, 40 A at 500 V, 35 A at 690 V. These are the maximum fuse ratings for backup protection — do not oversize them or the coordination fails.","metaTitle":"Siemens 3RV2421-1GA10 SIRIUS Circuit Breaker, Transformer Pr","metaDescription":"Siemens 3RV2421-1GA10 SIRIUS circuit breaker for transformer protection. 100 kA breaking capacity at 400 V, Trip Class 10, 45 mm wide. Current lifecycle stage. Sourced to order aga","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"97 mm","Width":"45 mm","title":"3RV2421-1GA10","Height":"97 mm","Upwards":"50 mm","Forwards":"0 mm","at 400 V":"gL/gG 50 A","at 500 V":"gL/gG 40 A","at 690 V":"gL/gG 35 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 transformer protection A-release 4.5...6.3 A Short-circuit release 130 A Screw terminal Standard switching capacity","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)","Product Brand Name":"SIRIUS","Product Designation":"Circuit breaker","at 230 V rated value":"0.5 hp","at 240 V rated value":"100 kA","at 400 V rated value":"100 kA","at 480 V rated value":"6.3 A","at 500 V rated value":"100 kA","at 600 V rated value":"6.3 A","at 690 V rated value":"4 kA","Design Of The Product":"For transformer protection","Ground Fault Detection":"No","Phase Failure Detection":"Yes","For Main Current Circuit":"screw-type terminals","at 110/120 V rated value":"0.25 hp","at 200/208 V rated value":"1 hp","at 220/230 V rated value":"1.5 hp","at 460/480 V rated value":"3 hp","at 575/600 V rated value":"5 hp","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":"6 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":"5.5 W","at AC-3 at 400 V rated value":"6.3 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":"6.3 A","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"6.3 A","Design Of The Short-Circuit Trip":"magnetic","for AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 8)","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":"1.8 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","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":"130 A","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"4.5 ... 6.3 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$38.10","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/c71372a193acc7dc325632c490049a66.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1135056&mlfb=3RV2421-1GA10"},"ai":{"faq":[{"question":"What is 3RV2421-1GA10's listed depth?","answer":"The depth is 97 mm, with a width of 45 mm and height of 97 mm."},{"question":"Will 3RV2421-1GA10 drop into a panel specified around 3RV2021-1FA15 without rewiring?","answer":"Both are 45 mm wide SIRIUS breakers on 35 mm DIN rail, so the footprint is the same. However, 3RV2421-1GA10 is a transformer-protection design while 3RV2021-1FA15 is a motor-protection design — the trip curves and thermal settings differ. Verify the protection coordination before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2421-1GA10","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/3RV2421-1GA10 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}}