{"product_id":"square-d-a1b345-circuit-breaker","title":"Square D | A1B345 | Circuit Breaker | 45A | 3-Pole | 240V","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eSquare D A1B345 Circuit Breaker\u003c\/strong\u003e is a dependable protection solution designed for maintenance, retrofit, and replacement projects where exact specifications matter. This 45A, 3-Pole, 240V breaker is built to integrate smoothly into compatible Square D installations, delivering consistent performance when you need to safeguard power distribution.\u003c\/p\u003e \u003ch3\u003eKey specifications at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 45 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\u003ePart number:\u003c\/strong\u003e A1B345\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Square D protective device\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this specific model stands out\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eExact compatibility through the part number:\u003c\/strong\u003e The A1B345 designation is your best reference to ensure a proper fit and electrical ratings within Square D panels.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTargeted for retrofit and replacement:\u003c\/strong\u003e Designed for scenarios where a like-for-like swap is needed to restore protected circuits without altering panel configurations.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClear electrical characteristics:\u003c\/strong\u003e 45A rating on a 240V circuit provides robust overcurrent protection for appropriate loads while preserving overall system performance.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003ePractical use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eReplacing a worn or failed 45A, 3-Pole breaker in existing Square D panels to minimize downtime.\u003c\/li\u003e \u003cli\u003e Retrofit projects where a legacy 3-Pole 240V device must be substituted with a compatible part using the A1B345 reference.\u003c\/li\u003e \u003cli\u003eMaintenance planning for facilities with standardized Square D components, ensuring consistent protection across distributed circuits.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eFit, rating, and ordering guidance\u003c\/h3\u003e\n\u003cp\u003eBefore purchasing, verify that your panel accepts the A1B345 and that the circuit demands align with \u003cstrong\u003e45A\u003c\/strong\u003e on a \u003cstrong\u003e240V\u003c\/strong\u003e supply. The part number \u003cstrong\u003eA1B345\u003c\/strong\u003e is the most reliable compatibility reference, helping you avoid misfits and ensure proper trip characteristics. If in doubt, compare the panel label and the existing breaker’s specifications to this model to confirm a seamless replacement.\u003c\/p\u003e \u003ch3\u003eHow this compares to alternatives\u003c\/h3\u003e\n\u003cp\u003eThis Square D solution is purpose-built to match the brand’s mounting geometry, terminal styles, and trip curves for consistent protection within compatible systems. It’s designed for straightforward replacement without adapters or panel reconfigurations, reducing install time and risk associated with cross-brand substitutions.\u003c\/p\u003e \u003ch3\u003eTips for installation and safety\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eAlways de-energize the panel and follow lockout\/tagout procedures before work.\u003c\/li\u003e \u003cli\u003eInspect the bus stab and mounting point for clean, undamaged contact surfaces to ensure reliable operation.\u003c\/li\u003e \u003cli\u003eKeep a spare A1B345 on hand for planned maintenance windows or urgent replacements, aligning with your panel’s standard component set.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Square D","offers":[{"title":"Default Title","offer_id":46427298136226,"sku":"A1B345","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_ad06fdd7-931c-4a09-bfbe-d05329579cd6.png?v=1765492978","url":"https:\/\/www.ampstate.com\/products\/square-d-a1b345-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}