{"product_id":"siemens-e43b040-circuit-breaker","title":"Siemens | E43B040 | Circuit Breaker | 40A | 480V | 18kA | Bolt-On","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eSiemens E43B040 Circuit Breaker\u003c\/strong\u003e — a precise 40A, 480V bolt-on protection device purpose-built for demanding industrial environments. With an 18kA interrupting capacity, this breaker is ready to safeguard critical equipment in retrofit, maintenance, and replacement projects where exact specs matter.\u003c\/p\u003e \u003cp\u003eKey specifications at a glance:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eAmperage: 40A\u003c\/li\u003e \u003cli\u003eVoltage: 480V\u003c\/li\u003e \u003cli\u003eInterrupting capacity: 18kA\u003c\/li\u003e \u003cli\u003eMounting: Bolt-On\u003c\/li\u003e \u003cli\u003ePart number: E43B040\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhy this Siemens breaker stands out for serious electrical systems:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eExact-fit compatibility\u003c\/strong\u003e: Rely on the part number E43B040 as the best reference for ensuring the right replacement or retrofit in compatible Siemens panels.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFast, secure installation\u003c\/strong\u003e: Bolt-On mounting simplifies field service, enabling solid mechanical and electrical connections with minimal downtime.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh fault-current protection\u003c\/strong\u003e: The 18kA interrupting rating provides robust protection against high-energy faults common in industrial networks.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDesigned for 480V circuits\u003c\/strong\u003e: Ideal for industrial distribution, motor feeders, and equipment protection in facilities powered by 480-volt electrical systems.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWho benefits most from the E43B040:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eMaintenance teams performing panel retrofits or replacements in existing Siemens installations.\u003c\/li\u003e \u003cli\u003eIndustrial facilities upgrading protection for 480V distribution and motor circuits.\u003c\/li\u003e \u003cli\u003eOEMs and integrators seeking reliable, field-friendly bolt-on breakers with precise specifications.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003ePractical considerations when ordering:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eAlways confirm fit and ratings before ordering. The part number is the best reference for compatibility with your panel.\u003c\/li\u003e \u003cli\u003eUse in applications designed for bolt-on breakers and ensure the panel can accommodate the E43B040 configuration.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eIn short, the Siemens E43B040 delivers dependable protection for 40A, 480V circuits with strong fault-current handling, wrapped in a bolt-on design tailored for efficient field service and precise compatibility. This is a purpose-built solution for engineers and technicians who demand exact specifications and minimal downtime in industrial settings.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46424385061026,"sku":"E43B040","price":310.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_a085eff1-75dd-47ee-b131-4c8df8f0489b.png?v=1765492976","url":"https:\/\/www.ampstate.com\/products\/siemens-e43b040-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}