{"product_id":"square-d-ejb14040-40a-277v-1-pole-bolt-on-circuit-breaker","title":"Square D EJB14040 - 40 A, 277 V, 1-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D EJB14040 from AmpState — a purpose-built 40 A, 277 V, 1-pole bolt-on molded case circuit breaker engineered to protect your branch circuits with precision. Designed for panelboards and load centers, this unit delivers dependable overcurrent and short-circuit protection where it matters most.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e ensures a rigid, vibration-resistant connection to the panel bus, reducing movement and maintaining consistent electrical contact even in environments with machinery or heavy use.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e combines thermal overload protection with instantaneous magnetic actuation for short circuits, providing stable, repeatable protection performance under varying load conditions.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible design\u003c\/strong\u003e engineered to integrate with matching Square D load centers and panelboards for a seamless, reliable fit and straightforward replacement.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application\u003c\/strong\u003e suitable for residential, commercial, and light industrial settings where 277 V circuits power lighting, equipment, and control devices.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePrecise 1-pole protection\u003c\/strong\u003e targeted at single-circuit branches, delivering dedicated protection without unnecessary disruption to adjacent circuits.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolded case construction\u003c\/strong\u003e provides rugged, durable performance in everyday electrical installations, with consistent performance across temperature and vibration conditions.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eTechnical details at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003ePart number: EJB14040\u003c\/li\u003e \u003cli\u003eAmperage rating: 40 A\u003c\/li\u003e \u003cli\u003eVoltage rating: 277 V\u003c\/li\u003e \u003cli\u003eNumber of poles: 1\u003c\/li\u003e \u003cli\u003eMounting style: Bolt-on\u003c\/li\u003e \u003cli\u003eType: Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003eApplication: Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this breaker adds value in real-world installations\u003c\/h3\u003e\n\u003cp\u003eIn commercial and light industrial panels, reliability and plug-and-play compatibility matter as much as protection. The Square D EJB14040 is built to stand up to the daily rigors of 277-volt circuits—think office lighting, HVAC controls, and auxiliary equipment—while providing a robust bus connection that resists loosening from vibration or thermal cycling. By pairing a stable thermal-magnetic trip with a secure bolt-on mount, you gain predictable protection that won’t drift as loads shift throughout the day.\u003c\/p\u003e \u003cp\u003eIf you’re upgrading an existing panelboard or stocking a replacement inventory, this 40 A, 277 V breaker from Square D offers a direct, compatible option for 1-pole circuits. Its design emphasizes longevity and consistency, helping reduce nuisance trips and ensuring that critical circuits stay energized when they should.\u003c\/p\u003e \u003ch3\u003eWho benefits most\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eElectrical contractors assembling or upgrading commercial panelboards and load centers that operate on 277 V systems.\u003c\/li\u003e \u003cli\u003eFacilities managers overseeing lighting and power distribution in office buildings, retail spaces, healthcare clinics, or light industrial facilities.\u003c\/li\u003e \u003cli\u003eService technicians replacing aging breakers in single-pole branch circuits where a bolt-on, molded case design is preferred for durability.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003ePractical tips for optimal use\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eConfirm panel compatibility: ensure the host panelboard is rated for 277 V operation and accepts bolt-on molded case breakers of the EJB family.\u003c\/li\u003e \u003cli\u003ePlan for serviceability: bolt-on mounting facilitates quick removal and replacement in crowded or hard-to-reach panel areas.\u003c\/li\u003e \u003cli\u003eMatch trip characteristics to load: use the thermal-magnetic protection to cover both sustained overloads and short-circuit events for consistent performance.\u003c\/li\u003e \u003cli\u003eKeep spares on hand: for mission-critical commercial circuits, maintain a ready-to-install replacement to minimize downtime during maintenance windows.\u003c\/li\u003e \u003cli\u003eFollow manufacturer guidelines: install only in panels designed to accommodate this specific ampacity and voltage rating to preserve panel integrity and safety.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWith the Square D EJB14040 40 A, 277 V, 1-Pole Bolt-On Circuit Breaker, AmpState delivers a rugged, dependable solution that prioritizes precise protection, straightforward installation, and compatibility with standard Square D panel systems. It’s the practical choice when you need solid branch-circuit protection that stands up to the demands of commercial and light industrial electrical environments.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355206963362,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/schnieder_and_square_d_breaker_and_panel_e4ae243a-45a0-405f-9620-d045ddc7d26b.png?v=1764690352","url":"https:\/\/www.ampstate.com\/products\/square-d-ejb14040-40a-277v-1-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}