{"product_id":"frs-r-4","title":"FRS-R-4 - 4Amp Fuse","description":"\u003cp\u003e\u003cstrong\u003eFRS-R-4 - 4Amp Fuse\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhen your system demands dependable protection for induction loads, motors, transformers, or lighting panels, the Eaton Bussmann FRS‑R‑4 stands out. This 4‑amp, Class RK5, dual‑element time‑delay fuse is engineered to handle transient surges without nuisance tripping—while still offering robust fault‑current interruption. Rated at 600 Vac\/300 Vdc, and capable of interrupting up to 200 kA at 600 V AC and 20 kA at 300 V DC, it serves as a high‑performance safety component in demanding industrial and commercial electrical installations. With a compact 5‑inch form factor and ferrule‑end terminations for standard RK5 holders, the FRS‑R‑4 is ideal when you need high reliability, efficient installation, and long-term protection of mission‑critical circuits.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features and Benefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTime‑Delay Dual‑Element Design:\u003c\/strong\u003e Allows for momentary inrush currents—such as motor startups or transformer energizing—without sacrificing protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent‑Limiting Technology:\u003c\/strong\u003e Reduces let‑through energy during faults, safeguarding downstream components and reducing wear on switchgear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Engineered Form:\u003c\/strong\u003e A 5.00 inch × 0.81 inch cartridge with ferrule‑end terminations ensures fast, secure installation into standard RK5 fuse holders—minimizing downtime.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnergy‑Efficient Operation:\u003c\/strong\u003e Maintains cooler temperatures under load and less stress during short surges, helping to lower maintenance rates and power loss.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCatalog Number:\u003c\/strong\u003e FRS‑R‑4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmperage Rating:\u003c\/strong\u003e 4 A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage Rating:\u003c\/strong\u003e 600 Vac \/ 300 Vdc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterrupting Rating:\u003c\/strong\u003e 200 kA at 600 V AC; 20 kA at 300 V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResponse Time:\u003c\/strong\u003e 10 seconds (minimum) at 500% of rated current\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuse Class:\u003c\/strong\u003e RK5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection Type:\u003c\/strong\u003e Ferrule end × Ferrule end (holder‑mount)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e Approx. 5 in (L) × 0.81 in (W) × 0.81 in (H)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e Approximately 0.13 lb (typical for this size)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eMaterial Compliance and Certifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eMeets UL 248‑12 and CSA C22.2 No. 248.12 for Class RK5 fuses.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eCE marked for international installations.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eRoHS‑compliant, aligning with modern environmental and sustainability initiatives.\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eWhere It Works Best\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIdeal for protecting motor starters, HVAC systems, lighting and pump controls—especially in circuits where startup surges are expected.\u003c\/li\u003e\n\u003cli\u003ePerfect for industrial power panels, conveyor systems, and automation equipment where interruption of service due to faults must be minimized.\u003c\/li\u003e\n\u003cli\u003eWhen your installation calls for a time‑delay fuse capable of handling large inrush currents and still delivering high fault‑current protection, the FRS‑R‑4 is a smart choice.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\n\u003cbr\u003e\n\u003cdiv\u003e\n\u003cblockquote\u003e\n\u003cp style=\"font-size: 12px;\"\u003e\u003cem\u003eUse of Original Equipment Manufacturer (OEM) trademarks, names, and logos is for informational and identification purposes only. This does not imply any affiliation, sponsorship, endorsement, or approval by the original equipment manufacturer. All trademarks and registered trademarks are the property of their respective owners.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Mersen","offers":[{"title":"New In Box","offer_id":50459194327339,"sku":"FRS-R-4","price":0.0,"currency_code":"USD","in_stock":false},{"title":"Refurbished","offer_id":50459194360107,"sku":"FRS-R-4  [R]","price":0.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0848\/0758\/1995\/files\/FRSR10copy_c514ee2f-16bb-4376-a650-16a132e51338.png?v=1748458252","url":"https:\/\/store.circuitbreakersuperstore.com\/products\/frs-r-4","provider":"CIRCUIT BREAKER SUPERSTORE®","version":"1.0","type":"link"}