{"product_id":"eaton-hfd4040-circuit-breaker","title":"Eaton | HFD4040 | Circuit Breaker | 40A | 3-Pole | 600V","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Eaton HFD4040—an industrial-grade circuit breaker engineered for dependable overcurrent protection in 3-phase 600V systems. With a 40-amp rating and a robust 3-pole design, this unit is built to guard motors, transformers, and other critical equipment in demanding electrical environments. Whether you’re maintaining an aging panel, retrofitting for higher demand, or replacing a failed breaker, the HFD4040 delivers consistent performance and easy compatibility with Eaton panels that fit the HFD family.\u003c\/p\u003e \u003ch3\u003eKey features that matter in the field\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e40A trip rating provides reliable protection for motors and heavy loads without unnecessary interruptions\u003c\/li\u003e \u003cli\u003e3-Pole design supports balanced protection for 3-phase circuits\u003c\/li\u003e \u003cli\u003e600V maximum system voltage suitable for industrial panels, MCCs, and heavy-duty distribution\u003c\/li\u003e \u003cli\u003ePrecise compatibility via the exact part number HFD4040, simplifying replacement decisions\u003c\/li\u003e \u003cli\u003eRugged construction designed to withstand the vibration, temperature shifts, and duty cycles typical in commercial and industrial environments\u003c\/li\u003e \u003cli\u003eClear labeling and standardized Eaton trip characteristics help technicians identify and service quickly\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eSpecification at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eAmperage: 40A\u003c\/li\u003e \u003cli\u003ePoles: 3-Pole\u003c\/li\u003e \u003cli\u003eVoltage: 600V\u003c\/li\u003e \u003cli\u003ePart reference: HFD4040\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003ePractical use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eMaintenance or replacement in existing Eaton electrical panels designed for HFD-series breakers\u003c\/li\u003e \u003cli\u003eRetrofits to accommodate higher-load 3-phase equipment while maintaining proper protection standards\u003c\/li\u003e \u003cli\u003eNew installations where a 40A, 3-pole, 600V breaker is required for safe, code-compliant distribution\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this matters for you\u003c\/h3\u003e\n\u003cp\u003eChoosing the HFD4040 isn’t just about meeting a spec—it's about ensuring continuity and protection for your critical loads. The 3-pole design ensures all phases are protected evenly, reducing the risk of nuisance trips or uneven current behavior. The 600V rating aligns with many industrial distribution schemes, while the 40A rating matches typical motor drives and equipment footprints—allowing you to protect equipment without overburdening the electrical system.\u003c\/p\u003e \u003ch3\u003eInstallation notes and best practices\u003c\/h3\u003e\n\u003cp\u003eBefore you order, confirm fit and ratings for your specific panel configuration. The part number is the best reference for compatibility, so cross-check HFD4040 with your panel’s specifications and the manufacturer’s guidelines. If you’re replacing an existing HFD-series breaker, ensure the mounting and trip characteristics match your panel’s acceptance criteria to maintain proper protection coordination.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Eaton","offers":[{"title":"Default Title","offer_id":46426159448226,"sku":"HFD4040","price":2010.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/eaton-hfd4040-circuit-breaker-40a-3-pole-600v-588.webp?v=1789524391","url":"https:\/\/www.ampstate.com\/products\/eaton-hfd4040-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}