{"product_id":"siemens-e41b040-40a-1p-277v-circuit-breaker","title":"Siemens E41B040 40A 1P 277V Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet Siemens E41B040 — a purpose-built circuit breaker crafted to protect your electrical distribution when reliability matters most. With a 40 A rating, 1-pole design, and a 277V operating voltage, this unit delivers targeted overcurrent protection for critical circuits in panelboards and load centers.\u003c\/p\u003e \u003ch2\u003eDesigned for precise protection in commercial and industrial settings\u003c\/h2\u003e\n\u003cp\u003eThe Siemens E41B040 is purpose-made for panelboards, load centers, and electrical distribution networks where dependable single-pole protection at 277V is essential. It’s an excellent choice for retrofit work and maintenance planning, especially when keeping the original part number is important for records, warranties, and compatibility with existing gear.\u003c\/p\u003e \u003ch3\u003eKey features that matter in practice\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003e40 A, 1-Pole, 277V\u003c\/strong\u003e — tailored for branch circuits powering lighting, receptacles, and small equipment on 277V systems.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSingle-pole design\u003c\/strong\u003e — simplifies replacement in existing single-circuit feeders, reducing downtime during service or upgrades.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number stability\u003c\/strong\u003e — E41B040 ensures consistent replacements in maintenance inventories and retrofit projects without redefining documentation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAvailability from AmpState\u003c\/strong\u003e — sourced to support timely procurement for ongoing projects and part replacements.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eRetrofits in commercial buildings where a proven 277V, 40 A single-pole breaker matches existing configuration.\u003c\/li\u003e \u003cli\u003eMaintenance planning for distributed electrical systems that require strict part-number continuity for records and compliance.\u003c\/li\u003e \u003cli\u003eProtecting individual 277V circuits in panelboards and load centers serving lighting, HVAC controls, or small equipment racks.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy choose this Siemens breaker over alternatives\u003c\/h3\u003e\n\u003cp\u003eChoosing the Siemens E41B040 means adopting a solution that aligns with established infrastructure and documentation. Its 1P 277V specification is ideal for dedicated circuits in environments where voltage and current parameters are fixed, allowing for predictable trip behavior and straightforward replacement without reconfiguring the panel layout.\u003c\/p\u003e \u003ch3\u003ePractical sourcing and compatibility tips\u003c\/h3\u003e\n\u003cp\u003eIf you’re verifying compatibility for a retrofit or maintenance plan, consider matching the exact part number (E41B040) to maintain consistency across your spares and service records. AmpState lists this unit as available, helping you secure it without project delays. For installations in existing systems, confirm that the panelboard or load center supports a 277V, 1-pole protection device of this rating to ensure proper coordination with upstream protection and downstream circuits.\u003c\/p\u003e \u003ch3\u003eSpecifications at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eManufacturer: Siemens\u003c\/li\u003e \u003cli\u003ePart number: E41B040\u003c\/li\u003e \u003cli\u003eProduct type: Circuit Breaker\u003c\/li\u003e \u003cli\u003eAmperage: 40 A\u003c\/li\u003e \u003cli\u003ePoles: 1 Pole\u003c\/li\u003e \u003cli\u003eVoltage: 277V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"AmpState","offers":[{"title":"Default Title","offer_id":46413652918434,"sku":"E41B040","price":10.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-e41b040-40a-1p-277v-circuit-breaker-ampstate-breakers-403.webp?v=1789074792","url":"https:\/\/www.ampstate.com\/products\/siemens-e41b040-40a-1p-277v-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}