{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2742-5DD10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2742-5DD10","canonicalUrl":"https://aoctrl.com/siemens/3RV2742-5DD10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2742-5DD10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker, 3RV2742-5DD10, S3 frame, 25 A rated, 100 kA breaking capacity at 400 V AC, for system protection per UL 489, screw and snap-on DIN rail mounting.","salesMarkdown":"## SIRIUS 3RV2742-5DD10 — system protection breaker, S3 frame The Siemens SIRIUS 3RV2742-5DD10 is a 25 A rated circuit breaker in the S3 frame size, designed for system protection per UL 489 and CSA C22.2 No. 5. It combines a thermal overload release and a magnetic short-circuit trip in one package, sized for motor branch circuits and distribution panels where UL 489 listing is required by code. Breaking capacity reaches 100 kA at 240 V AC and 100 kA at 400 V AC — the higher figure at 400 V means it handles fault currents in 400 V distribution without cascading upstream breakers. At 400 V rated value the spec is 50 kA; the AC at 400 V rated value is 100 kA, so the lower figure governs the thermal-magnetic trip curve while the higher one applies to the interrupting rating under AC conditions. The S3 frame (70 mm wide, 170 mm tall, 176 mm deep) leaves 70 mm clearance above and below, 10 mm at the sides for heat dissipation. Main circuit terminals are screw-type, accepting 2x (2.5…16 mm²) solid or 2x (2.5…50 mm²) stranded, with a single conductor up to 70 mm². The front clamping point accepts 10 AWG only. Auxiliary contacts use M8 bolts. The screwdriver shaft is hexagonal socket, 4 mm tip size. No ground fault or phase failure detection built in — this is a straight thermal-magnetic breaker for overcurrent and short-circuit protection only. An auxiliary switch can be added (product extension auxiliary switch: yes).","metaTitle":"Siemens 3RV2742-5DD10 SIRIUS Circuit Breaker, 25 A, 100 kA","metaDescription":"Siemens SIRIUS 3RV2742-5DD10 circuit breaker, 25 A rated, 100 kA breaking at 400 V AC. UL 489 system protection. S3 frame, screw/snap-on DIN rail. Active production, sourced to ord","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"176 mm","Solid":"2x (2.5 ... 16 mm²)","Width":"70 mm","title":"3RV2742-5DD10","Height":"170 mm","Upwards":"70 mm","Downwards":"70 mm","At The Side":"10 mm","Rated Value":"20 ... 600 V","description":"Circuit breaker size S3 for system protection with approval circuit breaker UL 489, CSA C22.2 No.5-02 A-release 25 A N-release 325 A screw terminal","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 DIN rail according to DIN EN 60715","For Main Contacts":"M8","Mounting Position":"any","Solid Or Stranded":"2x (2,5 ... 50 mm²), 1x (10 ... 70 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Circuit breaker","at 240 V rated value":"100 kA","at 400 V rated value":"50 kA","Design Of The Product":"For system protection according to UL 489/CSA C22.2 No. 5","Ground Fault Detection":"No","Phase Failure Detection":"No","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","Design Of Screwdriver Shaft":"Hexagonal socket","Size Of The Circuit-Breaker":"S3","Size Of The Screwdriver Tip":"4 mm","Of The Main Contacts Typical":"25 000","at AC in hot operating state":"14 W","Of Auxiliary Contacts Typical":"25 000","Substance Prohibitance (Date)":"03/01/2017","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"25 A","at AWG cables for main contacts":"10 only front clamping point","Design Of The Short-Circuit Trip":"magnetic","Product Extension Auxiliary Switch":"Yes","Relative Humidity During Operation":"10 ... 95 %","Display Version For Switching Status":"Handle","Surge Voltage Resistance Rated Value":"8 kV","at AC in hot operating state per pole":"4.7 W","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (2.5 ... 35 mm²), 1x (2.5 ... 50 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","Finely Stranded Without Core End Processing":"2x (10 ... 35 mm²), 1x (10 ... 50 mm²)","For Main Contacts With Screw-Type Terminals":"4.5 ... 6 N·m","at 480 V AC according to UL 489 rated value":"65 kA","with high demand rate according to SN 31920":"50 %","shock resistance according to IEC 60068-2-27":"25 g / 11 ms (rectangular impulse and sine pulse)","Electrical Endurance (Operating Cycles) Typical":"25 000","at 480 AC Y/277 V according to UL 489 rated value":"65 kA","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":"325 A","insulation voltage with degree of pollution 3 at AC rated value":"1 000 V","at AWG cables for main contacts for box terminal using the front clamping point":"10 only front clamping point"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$166.37","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4a02666dd56e94190b7bd45371387166.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=630010&mlfb=3RV2742-5DD10"},"ai":{"faq":[{"question":"What is the breaking capacity of 3RV2742-5DD10?","answer":"100 kA at 240 V AC and 100 kA at 400 V AC (interrupting rating under AC conditions). At 400 V rated value the spec is 50 kA, which governs the thermal-magnetic trip curve."},{"question":"What wire sizes does the 3RV2742-5DD10 accept?","answer":"Main terminals accept 2x (2.5…16 mm²) solid or 2x (2.5…50 mm²) stranded, with a single conductor up to 70 mm². The front clamping point accepts 10 AWG only."},{"question":"Where can I buy 3RV2742-5DD10?","answer":"Sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2742-5DD10","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/3RV2742-5DD10 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}}