{"product_id":"square-d-le3400u31x","title":"Square D LE3400U31X 400A 3-Pole 600 V Circuit Breaker","description":"\u003cdiv\u003e\n\u003cp\u003eThe Square D LE3400U31X is engineered for serious electrical protection in demanding environments. With a 400 A rating, 3 poles, and a 600 V maximum, this circuit breaker delivers reliable overcurrent protection for three‑phase feeders and heavy-duty equipment in industrial and commercial panels. Part of Square D’s trusted LE series, the LE3400U31X is built to fit compatible Square D installations and provide quick, dependable interrupting performance when it matters most.\u003c\/p\u003e \u003ch2\u003eWhy the LE3400U31X matters\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eHigh-current reliability:\u003c\/strong\u003e 400 A capacity protects large feeders and motor circuits without frequent trips.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThree-pole design:\u003c\/strong\u003e Ideal for balanced three-phase systems, reducing single-phase imbalances and simplifying wiring in 3‑phase layouts.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e600 V rating:\u003c\/strong\u003e Suitable for modern industrial and commercial distribution environments, offering appropriate protection for common high-voltage applications.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDurable lineage:\u003c\/strong\u003e Part of Square D’s established LE series, known for dependable performance in demanding installations.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eReplacement-ready:\u003c\/strong\u003e A practical, drop-in option for panels that specify LE3400U31X, helping minimize downtime during maintenance or upgrades.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eIdeal use cases\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eMain service disconnects or feeder protection in commercial buildings with three‑phase power.\u003c\/li\u003e \u003cli\u003eMotor control applications in manufacturing or processing facilities handling large loads.\u003c\/li\u003e \u003cli\u003eBackup or critical-load circuits where consistent, predictable trip characteristics are essential.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eInstallation and compatibility\u003c\/h2\u003e\n\u003cp\u003ePlace the LE3400U31X in compatible Square D panels designed for LE-series breakers. Before installation, confirm that the panel accepts the LE3400U31X form factor and that the system’s voltage and conductor sizing align with the 600 V rating and 400 A protection level. This model is designed for straightforward replacement in established Square D configurations, helping technicians minimize panel downtime during service or upgrades.\u003c\/p\u003e \u003ch2\u003eMaintenance and longevity\u003c\/h2\u003e\n\u003cp\u003eFor enduring performance, routinely inspect connections for tightness and signs of wear, and replace any breaker showing corrosion or physical damage. Keeping spare LE3400U31X units on hand can reduce downtime and keep critical processes online during planned maintenance or unexpected outages.\u003c\/p\u003e \u003ch2\u003eSpecifications at a glance\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eCurrent rating: 400 A\u003c\/li\u003e \u003cli\u003ePoles: 3\u003c\/li\u003e \u003cli\u003eVoltage rating: 600 V\u003c\/li\u003e \u003cli\u003ePart number: LE3400U31X\u003c\/li\u003e \u003cli\u003eManufacturer: Square D\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Square D","offers":[{"title":"Default Title","offer_id":46423101636770,"sku":"LE3400U31X","price":1861.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_229276d9-908d-46df-93e5-6fe31866e0ff.png?v=1765492975","url":"https:\/\/www.ampstate.com\/products\/square-d-le3400u31x","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}