{"product_id":"square-d-pbq3640g-400a-3p-600v-safety-switch","title":"Square D PBQ3640G 400A 3P 600V Safety Switch, Fusible | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eBuilt for everyday electrical work, the Square D PBQ3640G Fusible Safety Switch is your reliable solution for equipment disconnect and isolation at the point of use. With a rugged 400 A rating, 3 poles, and a 600 V capability, this switch is engineered to keep critical circuits secure while making maintenance and retrofit work straightforward.\u003c\/p\u003e \u003ch2\u003eWhy the PBQ3640G stands out\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eFusible protection in a compact safety switch:\u003c\/strong\u003e integrated fuse elements deliver rapid fault interruption, enhancing downstream protection and improving arc-flash safety during faults.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoint-of-use isolation:\u003c\/strong\u003e streamlines maintenance and lockout\/tagout procedures by providing a clear, accessible disconnect right where the equipment is used.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRetrofit-friendly with consistent part numbers:\u003c\/strong\u003e designed to align with existing Square D configurations, making replacements and scheduled maintenance simpler when the part number must stay the same.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIndustrial-grade reliability:\u003c\/strong\u003e backed by Square D’s reputable legacy in safety and distribution equipment, built to withstand demanding environments.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Square D\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e PBQ3640G\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 400 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 600 V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Fusible safety switch\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eIdeal use cases\u003c\/h2\u003e\n\u003cp\u003eThis safety switch is well-suited for industrial and commercial environments where reliable isolation is essential. Practical applications include:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eDisconnection of large feeders and equipment in factories, processing plants, and distribution panels\u003c\/li\u003e \u003cli\u003eRetrofit projects where the exact part number must be preserved for compatibility or documentation\u003c\/li\u003e \u003cli\u003eMaintenance planning and scheduled shutdowns where a clear, safe point of isolation is required\u003c\/li\u003e \u003cli\u003eService entrances and motor control scenarios that demand robust 600 V protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eCompatibility and support\u003c\/h2\u003e\n\u003cp\u003eAmpState stocks the PBQ3640G and can assist with confirming fit for your specific setup. If you’re replacing an aging switch or planning a retrofit, we can help verify that the 400 A, 3-pole, 600 V fusible setup meets your circuit requirements and aligns with your existing equipment inventory.\u003c\/p\u003e \u003ch2\u003ePractical guidance for installation and maintenance\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eEnsure the enclosure and bus rating are compatible with a 400 A, 3-pole 600 V fusible switch.\u003c\/li\u003e \u003cli\u003ePrepare for proper fuse selection and replacement procedures in line with your system’s protection requirements.\u003c\/li\u003e \u003cli\u003eFollow standard lockout\/tagout practices during installation and servicing to maintain a safe work environment.\u003c\/li\u003e \u003cli\u003eSchedule periodic inspections of terminals and fuse links to sustain reliable performance over time.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWith the PBQ3640G, you gain a dependable, ready-to-install safety switch that supports efficient maintenance, precise isolation, and streamlined retrofits—backed by AmpState’s availability and compatibility assistance when you need it.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"AmpState","offers":[{"title":"Default Title","offer_id":46410919477410,"sku":"PBQ3640G","price":18089.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_83963f7f-600e-419f-90c6-e7677089642b.png?v=1765492973","url":"https:\/\/www.ampstate.com\/products\/square-d-pbq3640g-400a-3p-600v-safety-switch","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}