{"product_id":"eaton-ehd1040-40a-277v-1-pole-bolt-on-circuit-breaker","title":"Eaton EHD1040 - 40 A, 277 V, 1-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eElevate electrical reliability with the Eaton EHD1040 — a 40A, 277V, 1-pole bolt-on molded case circuit breaker designed for dependable branch-circuit protection in panelboards and loadcenters.\u003c\/p\u003e \u003cp\u003eBuilt for rugged environments, this breaker uses secure bolt-on mounting to deliver a rigid, vibration-resistant bus connection that stays seated under heavy loads and through routine maintenance. Its thermal-magnetic trip unit provides stable, repeatable protection: the thermal element guards against nuisance overloads, while the magnetic element responds quickly to short-circuit conditions, helping minimize damage to wiring and equipment.\u003c\/p\u003e \u003cp\u003eDesigned for seamless integration, the EHD1040 is compatible with matching OEM loadcenters and panelboards, making it a practical choice for both replacements and new installations. With a 277V rating, it’s well-suited for commercial lighting circuits, electrical distribution in office buildings, and light industrial applications where reliable 277V protection is required.\u003c\/p\u003e \u003ch2\u003eKey benefits and ideal use cases\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e— provides a rigid, vibration-resistant connection that maintains electrical integrity in demanding environments.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic protection\u003c\/strong\u003e— stable nuisance-free operation with fast response to short circuits, reducing downtime and damage.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e277V operation\u003c\/strong\u003e— expands applicability beyond residential panels to commercial and light industrial installations.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM compatibility\u003c\/strong\u003e— straightforward replacement in existing installations with matched panelboards and loadcenters.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e1-pole, 40A configuration\u003c\/strong\u003e— precise protection for individual branch circuits, ideal for dedicated circuits in lighting, outlets, and small equipment loads.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eTechnical specifications at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Eaton\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e EHD1040\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage Rating:\u003c\/strong\u003e 40A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage Rating:\u003c\/strong\u003e 277V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 1\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting Style:\u003c\/strong\u003e Bolt-on\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhether you’re upgrading a panel, replacing a failed breaker, or configuring a new 277V distribution setup, the Eaton EHD1040 delivers reliable protection, ease of installation, and compatibility you can trust in residential, commercial, and light industrial environments.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349550977186,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/eaton-ehd1040-40-a-277-v-1-pole-bolt-on-circuit-breaker-ampstate-878.webp?v=1788682007","url":"https:\/\/www.ampstate.com\/products\/eaton-ehd1040-40a-277v-1-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}