{"product_id":"square-d-kc321501021-150a-3p-240v-circuit-breaker","title":"Square D KC321501021 Circuit Breaker, 150A, 3-Pole, 240V","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D KC321501021 Circuit Breaker—a rugged, purpose-built solution for industrial electrical service, maintenance, and replacement projects. This 150A, 3-pole device is designed to protect 240V three-phase distribution, delivering reliable safety and dependable performance where it matters most.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eKey specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 150 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3-pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 240V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Square D\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e KC321501021\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhy a 3-pole, 240V breaker is essential in industrial settings:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eProvides synchronized protection across all three phases, ensuring a safe and complete shutdown during overloads or faults.\u003c\/li\u003e \u003cli\u003eDesigned for use with Square D panels and compatible enclosures, making field replacements straightforward and reliable.\u003c\/li\u003e \u003cli\u003eIdeal for service entrances and equipment feeders powering three-phase machinery such as pumps, conveyors, motors, and industrial controls.\u003c\/li\u003e \u003cli\u003eBuilt to withstand demanding industrial environments while delivering consistent, predictable performance when the system is under load.\u003c\/li\u003e \u003cli\u003eClear compatibility guidance: verify fit by part number and application requirements to avoid mismatches in critical installations.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eHow to verify compatibility and install with confidence:\u003c\/p\u003e\n\u003cp\u003eUse the part number KC321501021 as your primary reference to confirm the exact fit for your panel or switchgear. Check your panel’s documentation for KC-series four- or three-pole 240V breakers and ensure the 150 A rating aligns with your circuit load calculations. If you’re uncertain about compatibility, you can reach out with the part number and panel details—we’ll help confirm fit and application requirements.\u003c\/p\u003e \u003cp\u003ePractical use cases and scenarios:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eReplacing a failed breaker in an industrial control panel serving three-phase equipment like machining centers or process lines, where reliable disconnection on all phases is critical.\u003c\/li\u003e \u003cli\u003eNew installations requiring a dedicated 3-pole 240V protective device to safely isolate all phases during maintenance.\u003c\/li\u003e \u003cli\u003eMaintenance planning for facilities that standardize on Square D KC-series components to streamline stocking, service response, and technician training.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhat sets this model apart:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003ePrecise part-number focus: KC321501021 ensures you’re selecting the exact device designed for compatibility within Square D’s KC-series ecosystem.\u003c\/li\u003e \u003cli\u003eThree-pole configuration at 240V provides uniform protection across all phases, a cornerstone for safety in 3-phase systems.\u003c\/li\u003e \u003cli\u003eRobust construction tailored for industrial environments, enabling dependable protection and straightforward replacement in field conditions.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003ePro tips for installation and ongoing reliability:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eBefore installation, confirm the panel accepts KC-series breakers and that the 150 A rating matches the protected circuits’ load calculations.\u003c\/li\u003e \u003cli\u003eMaintain a small inventory of common KC-series part numbers to minimize downtime during maintenance windows.\u003c\/li\u003e \u003cli\u003eDocument replacements with the part number KC321501021 and the panel model for accurate service records and audits.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eReady to confirm compatibility or place an order? Remember: verify fit by part number and application requirements. If you’d like assistance, send us a message with the part number and panel details, and we’ll help ensure you’re choosing the right device for your industrial electrical system.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"AmpState","offers":[{"title":"Default Title","offer_id":46415670444194,"sku":"KC321501021","price":460.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_513d6710-3734-4b27-839d-f68e6f4b470a.png?v=1765492974","url":"https:\/\/www.ampstate.com\/products\/square-d-kc321501021-150a-3p-240v-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}