{"product_id":"mersen-a4j450-class-j-fast-acting-fuse-450a-600vac-300vdc-amp-trap®-blade-fuse","title":"Mersen A4J450 Class J Fast-Acting Fuse – 450A – 600VAC\/300VDC – Amp-Trap® Blade Fuse","description":"\u003cp data-start=\"110\" data-end=\"625\"\u003eThe Mersen A4J450 is an Amp-Trap® Class J fast-acting fuse designed for high-performance overcurrent and short-circuit protection in industrial and commercial power distribution systems. Rated at 450 Amps, this current-limiting fuse delivers rapid fault interruption to protect equipment, feeders, and branch circuits. With voltage ratings of 600VAC and 300VDC, it is well suited for Class J fuse applications requiring compact size, high interrupting capacity, and fast response characteristics.\u003c\/p\u003e\n\u003ch3 data-section-id=\"yc43s8\" data-start=\"627\" data-end=\"649\"\u003eVoltage and Rating\u003c\/h3\u003e\n\u003cul data-start=\"651\" data-end=\"808\"\u003e\n\u003cli data-section-id=\"1b37dtx\" data-start=\"651\" data-end=\"679\"\u003eCurrent Rating: 450 Amps\u003c\/li\u003e\n\u003cli data-section-id=\"k5woin\" data-start=\"680\" data-end=\"715\"\u003eVoltage Rating: 600VAC \/ 300VDC\u003c\/li\u003e\n\u003cli data-section-id=\"12sfb1r\" data-start=\"716\" data-end=\"739\"\u003eFrequency: 50\/60 Hz\u003c\/li\u003e\n\u003cli data-section-id=\"lh2ska\" data-start=\"740\" data-end=\"763\"\u003eFuse Class: Class J\u003c\/li\u003e\n\u003cli data-section-id=\"125euby\" data-start=\"764\" data-end=\"808\"\u003eFuse Type: Fast-Acting, Current-Limiting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"uvdx3z\" data-start=\"810\" data-end=\"832\"\u003eKey Specifications\u003c\/h3\u003e\n\u003cul data-start=\"834\" data-end=\"1065\"\u003e\n\u003cli data-section-id=\"1auomsb\" data-start=\"834\" data-end=\"873\"\u003eProduct Type: Industrial Power Fuse\u003c\/li\u003e\n\u003cli data-section-id=\"3smyah\" data-start=\"874\" data-end=\"899\"\u003eSeries: Amp-Trap® A4J\u003c\/li\u003e\n\u003cli data-section-id=\"nbe2i7\" data-start=\"900\" data-end=\"923\"\u003ePart Number: A4J450\u003c\/li\u003e\n\u003cli data-section-id=\"1rqx052\" data-start=\"924\" data-end=\"965\"\u003eManufacturer: Mersen \/ Ferraz Shawmut\u003c\/li\u003e\n\u003cli data-section-id=\"jpwrkx\" data-start=\"966\" data-end=\"991\"\u003eMounting Style: Blade\u003c\/li\u003e\n\u003cli data-section-id=\"sfpg4b\" data-start=\"992\" data-end=\"1039\"\u003eResponse Type: Fast-Acting (non-time-delay)\u003c\/li\u003e\n\u003cli data-section-id=\"1ozdgpy\" data-start=\"1040\" data-end=\"1065\"\u003eCurrent Limiting: Yes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"nucr17\" data-start=\"1067\" data-end=\"1095\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul data-start=\"1097\" data-end=\"1565\"\u003e\n\u003cli data-section-id=\"1hj9j8m\" data-start=\"1097\" data-end=\"1188\"\u003eProtection Type: Overcurrent and short-circuit protection with fast clearing capability\u003c\/li\u003e\n\u003cli data-section-id=\"1tf934o\" data-start=\"1189\" data-end=\"1301\"\u003eApplication Suitability: Feeders, branch circuits, MCCs, control panels, and industrial distribution systems\u003c\/li\u003e\n\u003cli data-section-id=\"lqa1g\" data-start=\"1302\" data-end=\"1379\"\u003eCoordination Type: Supports selective coordination within Class J systems\u003c\/li\u003e\n\u003cli data-section-id=\"c22geh\" data-start=\"1380\" data-end=\"1471\"\u003eConstruction Features: Compact design, high interrupting rating, low let-through energy\u003c\/li\u003e\n\u003cli data-section-id=\"1srx7sg\" data-start=\"1472\" data-end=\"1565\"\u003eSystem Integration: Suitable for high-density electrical equipment and modern panelboards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"nr5bwx\" data-start=\"1567\" data-end=\"1594\"\u003eStandards and Approvals\u003c\/h3\u003e\n\u003cul data-start=\"1596\" data-end=\"1672\"\u003e\n\u003cli data-section-id=\"11a7gqd\" data-start=\"1596\" data-end=\"1609\"\u003eUL Listed\u003c\/li\u003e\n\u003cli data-section-id=\"1ygh62h\" data-start=\"1610\" data-end=\"1627\"\u003eCSA Certified\u003c\/li\u003e\n\u003cli data-section-id=\"1wpl8un\" data-start=\"1628\" data-end=\"1672\"\u003eCompliant with Class J fuse requirements\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"1aljov1\" data-start=\"1674\" data-end=\"1690\"\u003eProduct Data\u003c\/h3\u003e\n\u003cul data-start=\"1692\" data-end=\"1809\"\u003e\n\u003cli data-section-id=\"1rqx052\" data-start=\"1692\" data-end=\"1733\"\u003eManufacturer: Mersen \/ Ferraz Shawmut\u003c\/li\u003e\n\u003cli data-section-id=\"3smyah\" data-start=\"1734\" data-end=\"1759\"\u003eSeries: Amp-Trap® A4J\u003c\/li\u003e\n\u003cli data-section-id=\"nbe2i7\" data-start=\"1760\" data-end=\"1783\"\u003ePart Number: A4J450\u003c\/li\u003e\n\u003cli data-section-id=\"1geo52o\" data-start=\"1784\" data-end=\"1809\"\u003eEAN\/UPC: 782001960476\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"wggvqn\" data-start=\"1811\" data-end=\"1827\"\u003eApplications\u003c\/h3\u003e\n\u003cul data-start=\"1829\" data-end=\"2148\"\u003e\n\u003cli data-section-id=\"1g63lej\" data-start=\"1829\" data-end=\"1870\"\u003eIndustrial power distribution systems\u003c\/li\u003e\n\u003cli data-section-id=\"1jabemj\" data-start=\"1871\" data-end=\"1900\"\u003eBranch circuit protection\u003c\/li\u003e\n\u003cli data-section-id=\"1qwmxre\" data-start=\"1901\" data-end=\"1930\"\u003eFeeder circuit protection\u003c\/li\u003e\n\u003cli data-section-id=\"18xv2zo\" data-start=\"1931\" data-end=\"1963\"\u003eMotor control centers (MCCs)\u003c\/li\u003e\n\u003cli data-section-id=\"fgbk6c\" data-start=\"1964\" data-end=\"2006\"\u003eSwitchboards and switchgear assemblies\u003c\/li\u003e\n\u003cli data-section-id=\"sk3mdu\" data-start=\"2007\" data-end=\"2046\"\u003eCommercial electrical installations\u003c\/li\u003e\n\u003cli data-section-id=\"14cfsx6\" data-start=\"2047\" data-end=\"2106\"\u003eEquipment protection in high fault current environments\u003c\/li\u003e\n\u003cli data-section-id=\"riw7db\" data-start=\"2107\" data-end=\"2148\"\u003eControl panels and automation systems\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Mersen","offers":[{"title":"NEW","offer_id":48494205665529,"sku":"A4J450","price":138.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0750\/7810\/7385\/files\/PHP-A4J450-Mersen-TIMG_jpg.webp?v=1780841345","url":"https:\/\/mycircuitbreakers.com\/products\/mersen-a4j450-class-j-fast-acting-fuse-450a-600vac-300vdc-amp-trap%c2%ae-blade-fuse","provider":"My Circuit Breakers","version":"1.0","type":"link"}