{"product_id":"square-d-h366-heavy-duty-safety-switch-600a-3-pole-600v-ac-dc-fusible-disconnect-nema-1-indoor-enclosure","title":"Square D H366 Heavy Duty Safety Switch – 600A – 3 Pole – 600V AC\/DC – Fusible Disconnect – NEMA 1 Indoor Enclosure","description":"\u003cdiv class=\"qMYqUG_convSearchResultHighlightRoot\"\u003e\n\u003cdiv class=\"\" data-turn-id-container=\"request-6a2f8ed0-8f20-83ee-90ff-e9af7afa5f6d-3\" 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-6a2f8ed0-8f20-83ee-90ff-e9af7afa5f6d-3\" data-turn-id-container=\"request-6a2f8ed0-8f20-83ee-90ff-e9af7afa5f6d-3\" data-testid=\"conversation-turn-10\" 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=\"d2d408e0-a01e-49e9-9e40-506182086304\" dir=\"auto\" data-message-model-slug=\"gpt-5-5\" 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=\"141\" data-end=\"564\"\u003eThe Square D H366 Heavy Duty Safety Switch is a high-capacity fusible disconnect switch designed for demanding commercial, industrial, and power distribution applications where reliable equipment isolation and overcurrent protection are critical. Manufactured by Schneider Electric under the Square D brand, this heavy-duty safety switch is rated for 600A and supports systems operating up to 600V AC\/DC.\u003c\/p\u003e\n\u003cp data-start=\"566\" data-end=\"933\"\u003eFeaturing a 3-pole, 3-wire configuration, the H366 provides a safe and dependable means of disconnecting power to large motors, feeders, service entrance equipment, and industrial machinery. When equipped with Class H fuses, the switch delivers effective short-circuit and overcurrent protection while ensuring safe isolation for maintenance and servicing operations.\u003c\/p\u003e\n\u003cp data-start=\"935\" data-end=\"1267\"\u003eThe switch incorporates a quick-make, quick-break operating mechanism that provides fast and positive contact operation, enhancing both safety and reliability. Built to withstand rigorous industrial use, the H366 exceeds standard heavy-duty performance requirements and offers long mechanical service life in demanding environments.\u003c\/p\u003e\n\u003cp data-start=\"1269\" data-end=\"1613\"\u003eHoused in a NEMA 1 indoor enclosure, the switch is ideal for installation in electrical rooms, manufacturing facilities, commercial buildings, and other protected indoor locations. Its robust construction and high horsepower rating make it suitable for large motor and power distribution applications requiring dependable switching performance.\u003c\/p\u003e\n\u003ch3 data-section-id=\"1yl5694\" data-start=\"1620\" data-end=\"1638\"\u003eSpecifications\u003c\/h3\u003e\n\u003cul data-start=\"1640\" data-end=\"2200\"\u003e\n\u003cli data-section-id=\"yuqlrx\" data-start=\"1640\" data-end=\"1685\"\u003e\n\u003cstrong data-start=\"1642\" data-end=\"1652\"\u003eBrand:\u003c\/strong\u003e Square D by Schneider Electric\u003c\/li\u003e\n\u003cli data-section-id=\"18ogbc7\" data-start=\"1686\" data-end=\"1741\"\u003e\n\u003cstrong data-start=\"1688\" data-end=\"1705\"\u003eManufacturer:\u003c\/strong\u003e Square D Co. \/ Schneider Electric\u003c\/li\u003e\n\u003cli data-section-id=\"1wvbxzx\" data-start=\"1742\" data-end=\"1767\"\u003e\n\u003cstrong data-start=\"1744\" data-end=\"1760\"\u003ePart Number:\u003c\/strong\u003e H366\u003c\/li\u003e\n\u003cli data-section-id=\"qboc8c\" data-start=\"1768\" data-end=\"1785\"\u003e\n\u003cstrong data-start=\"1770\" data-end=\"1780\"\u003eModel:\u003c\/strong\u003e E4\u003c\/li\u003e\n\u003cli data-section-id=\"1xmgg6p\" data-start=\"1786\" data-end=\"1836\"\u003e\n\u003cstrong data-start=\"1788\" data-end=\"1801\"\u003eCategory:\u003c\/strong\u003e Fusible Heavy Duty Safety Switch\u003c\/li\u003e\n\u003cli data-section-id=\"e6v92b\" data-start=\"1837\" data-end=\"1882\"\u003e\n\u003cstrong data-start=\"1839\" data-end=\"1855\"\u003eDevice Type:\u003c\/strong\u003e Heavy Duty Safety Switch\u003c\/li\u003e\n\u003cli data-section-id=\"1de219k\" data-start=\"1883\" data-end=\"1915\"\u003e\n\u003cstrong data-start=\"1885\" data-end=\"1905\"\u003eDisconnect Type:\u003c\/strong\u003e Fusible\u003c\/li\u003e\n\u003cli data-section-id=\"123ea7m\" data-start=\"1916\" data-end=\"1951\"\u003e\n\u003cstrong data-start=\"1918\" data-end=\"1936\"\u003eSwitch Action:\u003c\/strong\u003e Single Throw\u003c\/li\u003e\n\u003cli data-section-id=\"rta89k\" data-start=\"1952\" data-end=\"1983\"\u003e\n\u003cstrong data-start=\"1954\" data-end=\"1974\"\u003eNumber of Poles:\u003c\/strong\u003e 3 Pole\u003c\/li\u003e\n\u003cli data-section-id=\"1we9717\" data-start=\"1984\" data-end=\"2030\"\u003e\n\u003cstrong data-start=\"1986\" data-end=\"2012\"\u003eCircuit Configuration:\u003c\/strong\u003e 3-Phase, 3-Wire\u003c\/li\u003e\n\u003cli data-section-id=\"72t1fv\" data-start=\"2031\" data-end=\"2059\"\u003e\n\u003cstrong data-start=\"2033\" data-end=\"2052\"\u003eCurrent Rating:\u003c\/strong\u003e 600A\u003c\/li\u003e\n\u003cli data-section-id=\"1yodjnh\" data-start=\"2060\" data-end=\"2094\"\u003e\n\u003cstrong data-start=\"2062\" data-end=\"2081\"\u003eVoltage Rating:\u003c\/strong\u003e 600V AC\/DC\u003c\/li\u003e\n\u003cli data-section-id=\"otm28v\" data-start=\"2095\" data-end=\"2122\"\u003e\n\u003cstrong data-start=\"2097\" data-end=\"2112\"\u003eFuse Class:\u003c\/strong\u003e Class H\u003c\/li\u003e\n\u003cli data-section-id=\"ij16yi\" data-start=\"2123\" data-end=\"2162\"\u003e\n\u003cstrong data-start=\"2125\" data-end=\"2147\"\u003eHorsepower Rating:\u003c\/strong\u003e Up to 500 HP\u003c\/li\u003e\n\u003cli data-section-id=\"vsei5z\" data-start=\"2163\" data-end=\"2200\"\u003e\n\u003cstrong data-start=\"2165\" data-end=\"2184\"\u003eEnclosure Type:\u003c\/strong\u003e NEMA 1 Indoor\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"1g5d8j4\" data-start=\"2207\" data-end=\"2233\"\u003eElectrical Performance\u003c\/h3\u003e\n\u003cul data-start=\"2235\" data-end=\"2527\"\u003e\n\u003cli data-section-id=\"1g9l4qy\" data-start=\"2235\" data-end=\"2262\"\u003e\n\u003cstrong data-start=\"2237\" data-end=\"2255\"\u003eRated Current:\u003c\/strong\u003e 600A\u003c\/li\u003e\n\u003cli data-section-id=\"1lpt376\" data-start=\"2263\" data-end=\"2298\"\u003e\n\u003cstrong data-start=\"2265\" data-end=\"2285\"\u003eMaximum Voltage:\u003c\/strong\u003e 600V AC\/DC\u003c\/li\u003e\n\u003cli data-section-id=\"1d8m5to\" data-start=\"2299\" data-end=\"2335\"\u003e\n\u003cstrong data-start=\"2301\" data-end=\"2325\"\u003ePhase Configuration:\u003c\/strong\u003e 3-Phase\u003c\/li\u003e\n\u003cli data-section-id=\"619hvm\" data-start=\"2336\" data-end=\"2383\"\u003e\n\u003cstrong data-start=\"2338\" data-end=\"2358\"\u003eFuse Protection:\u003c\/strong\u003e Class H Fusible Design\u003c\/li\u003e\n\u003cli data-section-id=\"1rjlpro\" data-start=\"2384\" data-end=\"2431\"\u003e\n\u003cstrong data-start=\"2386\" data-end=\"2425\"\u003eQuick-Make \/ Quick-Break Mechanism:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli data-section-id=\"4v5sln\" data-start=\"2432\" data-end=\"2492\"\u003e\n\u003cstrong data-start=\"2434\" data-end=\"2486\"\u003eSuitable for Heavy-Duty Industrial Applications:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli data-section-id=\"7jqrt9\" data-start=\"2493\" data-end=\"2527\"\u003e\n\u003cstrong data-start=\"2495\" data-end=\"2512\"\u003eMotor Rating:\u003c\/strong\u003e Up to 500 HP\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"1qpthm9\" data-start=\"2534\" data-end=\"2572\"\u003eMechanical \u0026amp; Construction Features\u003c\/h3\u003e\n\u003cul data-start=\"2574\" data-end=\"2911\"\u003e\n\u003cli data-section-id=\"1b3ffo8\" data-start=\"2574\" data-end=\"2618\"\u003eHeavy-duty industrial-grade construction\u003c\/li\u003e\n\u003cli data-section-id=\"5piolc\" data-start=\"2619\" data-end=\"2655\"\u003eSingle-throw switching mechanism\u003c\/li\u003e\n\u003cli data-section-id=\"tw33x4\" data-start=\"2656\" data-end=\"2685\"\u003eFusible disconnect design\u003c\/li\u003e\n\u003cli data-section-id=\"hr7164\" data-start=\"2686\" data-end=\"2723\"\u003eQuick-make, quick-break operation\u003c\/li\u003e\n\u003cli data-section-id=\"f1k9mb\" data-start=\"2724\" data-end=\"2762\"\u003eVisible blade disconnect mechanism\u003c\/li\u003e\n\u003cli data-section-id=\"1sw10xd\" data-start=\"2763\" data-end=\"2808\"\u003eLarge-capacity power switching capability\u003c\/li\u003e\n\u003cli data-section-id=\"6455gl\" data-start=\"2809\" data-end=\"2866\"\u003eDesigned for frequent operation and long service life\u003c\/li\u003e\n\u003cli data-section-id=\"5y9s2q\" data-start=\"2867\" data-end=\"2911\"\u003eEnclosed rotary disconnect configuration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"tsjdab\" data-start=\"2918\" data-end=\"2941\"\u003eDimensions \u0026amp; Weight\u003c\/h3\u003e\n\u003cul data-start=\"2943\" data-end=\"3018\"\u003e\n\u003cli data-section-id=\"1mh6lee\" data-start=\"2943\" data-end=\"2967\"\u003e\n\u003cstrong data-start=\"2945\" data-end=\"2955\"\u003eWidth:\u003c\/strong\u003e 27.88 in.\u003c\/li\u003e\n\u003cli data-section-id=\"ftfb7f\" data-start=\"2968\" data-end=\"2992\"\u003e\n\u003cstrong data-start=\"2970\" data-end=\"2980\"\u003eDepth:\u003c\/strong\u003e 10.13 in.\u003c\/li\u003e\n\u003cli data-section-id=\"18re63z\" data-start=\"2993\" data-end=\"3018\"\u003e\n\u003cstrong data-start=\"2995\" data-end=\"3006\"\u003eHeight:\u003c\/strong\u003e 50.00 in.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"wggvqn\" data-start=\"3025\" data-end=\"3041\"\u003eApplications\u003c\/h3\u003e\n\u003cul data-start=\"3043\" data-end=\"3383\"\u003e\n\u003cli data-section-id=\"n7lx3w\" data-start=\"3043\" data-end=\"3084\"\u003eIndustrial power distribution systems\u003c\/li\u003e\n\u003cli data-section-id=\"1lgi4c8\" data-start=\"3085\" data-end=\"3129\"\u003eService entrance disconnect applications\u003c\/li\u003e\n\u003cli data-section-id=\"6afpo6\" data-start=\"3130\" data-end=\"3167\"\u003eLarge motor control and isolation\u003c\/li\u003e\n\u003cli data-section-id=\"ht42qz\" data-start=\"3168\" data-end=\"3196\"\u003eManufacturing facilities\u003c\/li\u003e\n\u003cli data-section-id=\"14uedct\" data-start=\"3197\" data-end=\"3237\"\u003eCommercial electrical infrastructure\u003c\/li\u003e\n\u003cli data-section-id=\"ulfw96\" data-start=\"3238\" data-end=\"3285\"\u003eDistribution feeders and switchgear systems\u003c\/li\u003e\n\u003cli data-section-id=\"g6zes2\" data-start=\"3286\" data-end=\"3336\"\u003eHeavy industrial equipment disconnecting means\u003c\/li\u003e\n\u003cli data-section-id=\"387z6p\" data-start=\"3337\" data-end=\"3383\"\u003eElectrical rooms and power control centers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"p3m70j\" data-start=\"3390\" data-end=\"3420\"\u003eStandards \u0026amp; Certifications\u003c\/h3\u003e\n\u003cul data-start=\"3422\" data-end=\"3657\"\u003e\n\u003cli data-section-id=\"1w9xzw2\" data-start=\"3422\" data-end=\"3435\"\u003eUL Listed\u003c\/li\u003e\n\u003cli data-section-id=\"1wp26ny\" data-start=\"3436\" data-end=\"3494\"\u003eComplies with applicable UL safety switch requirements\u003c\/li\u003e\n\u003cli data-section-id=\"11334dn\" data-start=\"3495\" data-end=\"3561\"\u003eDesigned for heavy-duty commercial and industrial applications\u003c\/li\u003e\n\u003cli data-section-id=\"3hsfk8\" data-start=\"3562\" data-end=\"3657\"\u003eSuitable for service and feeder disconnect applications when installed per applicable codes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"rwm0ne\" data-start=\"3664\" data-end=\"3689\"\u003eEnvironmental Ratings\u003c\/h3\u003e\n\u003cul data-start=\"3691\" data-end=\"3949\"\u003e\n\u003cli data-section-id=\"14e1am1\" data-start=\"3691\" data-end=\"3723\"\u003e\n\u003cstrong data-start=\"3693\" data-end=\"3714\"\u003eEnclosure Rating:\u003c\/strong\u003e NEMA 1\u003c\/li\u003e\n\u003cli data-section-id=\"j0uh9x\" data-start=\"3724\" data-end=\"3770\"\u003e\n\u003cstrong data-start=\"3726\" data-end=\"3752\"\u003eInstallation Location:\u003c\/strong\u003e Indoor Use Only\u003c\/li\u003e\n\u003cli data-section-id=\"16smo02\" data-start=\"3771\" data-end=\"3821\"\u003eDesigned for protected electrical environments\u003c\/li\u003e\n\u003cli data-section-id=\"l9iqf1\" data-start=\"3822\" data-end=\"3880\"\u003eDurable construction for industrial service conditions\u003c\/li\u003e\n\u003cli data-section-id=\"ocve3t\" data-start=\"3881\" data-end=\"3949\"\u003eLong-term reliability in commercial and industrial installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"8imf0z\" data-start=\"3956\" data-end=\"3982\"\u003eAdditional Information\u003c\/h3\u003e\n\u003cul data-start=\"3984\" data-end=\"4230\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\n\u003cli data-section-id=\"1s6ufqu\" data-start=\"3984\" data-end=\"4009\"\u003e\n\u003cstrong data-start=\"3986\" data-end=\"3994\"\u003eUPC:\u003c\/strong\u003e 785901451891\u003c\/li\u003e\n\u003cli data-section-id=\"ccj3ti\" data-start=\"4010\" data-end=\"4034\"\u003e\n\u003cstrong data-start=\"4012\" data-end=\"4023\"\u003eUNSPSC:\u003c\/strong\u003e 39122205\u003c\/li\u003e\n\u003cli data-section-id=\"1591j09\" data-start=\"4035\" data-end=\"4095\"\u003e\n\u003cstrong data-start=\"4037\" data-end=\"4050\"\u003eCategory:\u003c\/strong\u003e Enclosed Rotary Safety \/ Disconnect Switch\u003c\/li\u003e\n\u003cli data-section-id=\"xa7v7l\" data-start=\"4096\" data-end=\"4230\" data-is-last-node=\"\"\u003e\n\u003cstrong data-start=\"4098\" data-end=\"4118\"\u003eProp 65 Warning:\u003c\/strong\u003e Contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.\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":"Square D","offers":[{"title":"NEW","offer_id":48531445743865,"sku":"H366","price":4274.82,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0750\/7810\/7385\/files\/H325N-New-1_a02cbcc7-7e36-4acf-8212-167ace0eb10f.webp?v=1781521705","url":"https:\/\/mycircuitbreakers.com\/products\/square-d-h366-heavy-duty-safety-switch-600a-3-pole-600v-ac-dc-fusible-disconnect-nema-1-indoor-enclosure","provider":"My Circuit Breakers","version":"1.0","type":"link"}