{"product_id":"mersen-tr250r-class-rk5-time-delay-current-limiting-fuse-250a-250vac-250vdc-tri-onic®-series","title":"Mersen TR250R Class RK5 Time-Delay Current Limiting Fuse – 250A – 250VAC\/250VDC – Tri-Onic® Series","description":"\u003cdiv class=\"qMYqUG_convSearchResultHighlightRoot\"\u003e\n\u003cdiv class=\"\" data-turn-id-container=\"request-6a21ac48-87a0-83ec-890f-5a08b3a83112-13\" data-is-intersecting=\"true\"\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-6a21ac48-87a0-83ec-890f-5a08b3a83112-13\" data-turn-id-container=\"request-6a21ac48-87a0-83ec-890f-5a08b3a83112-13\" data-testid=\"conversation-turn-248\" data-scroll-anchor=\"false\" data-turn=\"assistant\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv data-conversation-screenshot-content=\"\" class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"35788985-a32f-462e-8214-2414d7341bcf\" dir=\"auto\" data-message-model-slug=\"gpt-5-3-mini\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-turn-start-message=\"true\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert wrap-break-word w-full dark markdown-new-styling\"\u003e\n\u003cp data-start=\"124\" data-end=\"721\"\u003eThe Mersen TR250R is a Tri-Onic® Class RK5 time-delay fuse designed for reliable overcurrent and short-circuit protection in industrial and commercial electrical systems. Rated at 250 Amps, this current-limiting fuse is engineered to safely handle motor starting currents and transformer inrush conditions while maintaining dependable protection for downstream equipment. With voltage ratings up to 250VAC and 250VDC, the TR250R is widely used in feeder circuits, branch circuits, service entrance equipment, motors, and transformers requiring coordinated time-delay protection.\u003c\/p\u003e\n\u003ch3 data-section-id=\"yc43s8\" data-start=\"723\" data-end=\"745\"\u003eVoltage and Rating\u003c\/h3\u003e\n\u003cul data-start=\"747\" data-end=\"899\"\u003e\n\u003cli data-section-id=\"c4tn2b\" data-start=\"747\" data-end=\"775\"\u003eCurrent Rating: 250 Amps\u003c\/li\u003e\n\u003cli data-section-id=\"f0vfiy\" data-start=\"776\" data-end=\"811\"\u003eVoltage Rating: 250VAC \/ 250VDC\u003c\/li\u003e\n\u003cli data-section-id=\"12sfb1r\" data-start=\"812\" data-end=\"835\"\u003eFrequency: 50\/60 Hz\u003c\/li\u003e\n\u003cli data-section-id=\"yle3iq\" data-start=\"836\" data-end=\"855\"\u003eFuse Class: RK5\u003c\/li\u003e\n\u003cli data-section-id=\"1uahc1k\" data-start=\"856\" data-end=\"899\"\u003eFuse Type: Time-Delay, Current-Limiting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"uvdx3z\" data-start=\"901\" data-end=\"923\"\u003eKey Specifications\u003c\/h3\u003e\n\u003cul data-start=\"925\" data-end=\"1131\"\u003e\n\u003cli data-section-id=\"13vyxxg\" data-start=\"925\" data-end=\"958\"\u003eProduct Type: Industrial Fuse\u003c\/li\u003e\n\u003cli data-section-id=\"1syok7k\" data-start=\"959\" data-end=\"985\"\u003eSeries: Tri-Onic® TR-R\u003c\/li\u003e\n\u003cli data-section-id=\"12to5qa\" data-start=\"986\" data-end=\"1009\"\u003ePart Number: TR250R\u003c\/li\u003e\n\u003cli data-section-id=\"1rqx052\" data-start=\"1010\" data-end=\"1051\"\u003eManufacturer: Mersen \/ Ferraz Shawmut\u003c\/li\u003e\n\u003cli data-section-id=\"jpwrkx\" data-start=\"1052\" data-end=\"1077\"\u003eMounting Style: Blade\u003c\/li\u003e\n\u003cli data-section-id=\"1ntyyar\" data-start=\"1078\" data-end=\"1105\"\u003eTime-Delay Feature: Yes\u003c\/li\u003e\n\u003cli data-section-id=\"1ozdgpy\" data-start=\"1106\" data-end=\"1131\"\u003eCurrent Limiting: Yes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"nucr17\" data-start=\"1133\" data-end=\"1161\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul data-start=\"1163\" data-end=\"1584\"\u003e\n\u003cli data-section-id=\"5o95e5\" data-start=\"1163\" data-end=\"1224\"\u003eProtection Type: Overcurrent and Short-Circuit Protection\u003c\/li\u003e\n\u003cli data-section-id=\"1x9zwlh\" data-start=\"1225\" data-end=\"1321\"\u003eSuitable For: Motors, Transformers, Feeders, Service Entrance Equipment, and Branch Circuits\u003c\/li\u003e\n\u003cli data-section-id=\"hbykbr\" data-start=\"1322\" data-end=\"1423\"\u003eInrush Current Handling: Designed to withstand motor starting and transformer energizing currents\u003c\/li\u003e\n\u003cli data-section-id=\"1pgt0dt\" data-start=\"1424\" data-end=\"1514\"\u003eConstruction Features: Time-Delay Operation, High Interrupting Current-Limiting Design\u003c\/li\u003e\n\u003cli data-section-id=\"1ufldt8\" data-start=\"1515\" data-end=\"1584\"\u003eApplication: Industrial and Commercial Power Distribution Systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"nr5bwx\" data-start=\"1586\" data-end=\"1613\"\u003eStandards and Approvals\u003c\/h3\u003e\n\u003cul data-start=\"1615\" data-end=\"1717\"\u003e\n\u003cli data-section-id=\"sbss6g\" data-start=\"1615\" data-end=\"1648\"\u003eRated Voltage AC (UL): 250VAC\u003c\/li\u003e\n\u003cli data-section-id=\"1n6ohl4\" data-start=\"1649\" data-end=\"1682\"\u003eRated Voltage DC (UL): 250VDC\u003c\/li\u003e\n\u003cli data-section-id=\"3f5stg\" data-start=\"1683\" data-end=\"1717\"\u003eFuse Classification: Class RK5\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"1aljov1\" data-start=\"1719\" data-end=\"1735\"\u003eProduct Data\u003c\/h3\u003e\n\u003cul data-start=\"1737\" data-end=\"1855\"\u003e\n\u003cli data-section-id=\"1rqx052\" data-start=\"1737\" data-end=\"1778\"\u003eManufacturer: Mersen \/ Ferraz Shawmut\u003c\/li\u003e\n\u003cli data-section-id=\"1syok7k\" data-start=\"1779\" data-end=\"1805\"\u003eSeries: Tri-Onic® TR-R\u003c\/li\u003e\n\u003cli data-section-id=\"12to5qa\" data-start=\"1806\" data-end=\"1829\"\u003ePart Number: TR250R\u003c\/li\u003e\n\u003cli data-section-id=\"6gdzh6\" data-start=\"1830\" data-end=\"1855\"\u003eEAN\/UPC: 782001748128\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"wggvqn\" data-start=\"1857\" data-end=\"1873\"\u003eApplications\u003c\/h3\u003e\n\u003cul data-start=\"1875\" data-end=\"2211\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\n\u003cli data-section-id=\"cmex8n\" data-start=\"1875\" data-end=\"1895\"\u003eMotor Protection\u003c\/li\u003e\n\u003cli data-section-id=\"174dhtj\" data-start=\"1896\" data-end=\"1922\"\u003eTransformer Protection\u003c\/li\u003e\n\u003cli data-section-id=\"m91t24\" data-start=\"1923\" data-end=\"1953\"\u003eService Entrance Equipment\u003c\/li\u003e\n\u003cli data-section-id=\"tk43vu\" data-start=\"1954\" data-end=\"1983\"\u003eFeeder Circuit Protection\u003c\/li\u003e\n\u003cli data-section-id=\"a2bybv\" data-start=\"1984\" data-end=\"2013\"\u003eBranch Circuit Protection\u003c\/li\u003e\n\u003cli data-section-id=\"yi6n97\" data-start=\"2014\" data-end=\"2055\"\u003eIndustrial Power Distribution Systems\u003c\/li\u003e\n\u003cli data-section-id=\"1cfavo2\" data-start=\"2056\" data-end=\"2095\"\u003eCommercial Electrical Installations\u003c\/li\u003e\n\u003cli data-section-id=\"a5hesb\" data-start=\"2096\" data-end=\"2121\"\u003eMotor Control Centers\u003c\/li\u003e\n\u003cli data-section-id=\"lqv8ok\" data-start=\"2122\" data-end=\"2162\"\u003eHeavy-Duty Electrical Infrastructure\u003c\/li\u003e\n\u003cli data-section-id=\"rhn5o5\" data-start=\"2163\" data-end=\"2211\" data-is-last-node=\"\"\u003eGeneral Purpose Overcurrent Protection Systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"z-0 flex min-h-[46px] justify-start\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"mt-3 w-full empty:hidden\"\u003e\n\u003cdiv class=\"text-center\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Mersen","offers":[{"title":"NEW","offer_id":48492795068665,"sku":"TR250R","price":85.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0750\/7810\/7385\/files\/PHP-TR250R-Mersen-TIMG_jpg.webp?v=1780821346","url":"https:\/\/mycircuitbreakers.com\/products\/mersen-tr250r-class-rk5-time-delay-current-limiting-fuse-250a-250vac-250vdc-tri-onic%c2%ae-series","provider":"My Circuit Breakers","version":"1.0","type":"link"}