{"product_id":"siemens-e43m040-circuit-breaker","title":"Siemens | E43M040 | Circuit Breaker | 40A | 3-Pole | 480V","description":"\u003cdiv\u003e\n\u003cp\u003eSiemens E43M040 Circuit Breaker is a purpose-built protection device for demanding industrial environments, delivering reliable 40-amp fault protection across a three-pole configuration at up to 480V. Designed as an exact OEM replacement, this part helps you maintain panel integrity and electrical safety without guesswork.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eKey specifications at a glance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 40A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePole count:\u003c\/strong\u003e 3-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating:\u003c\/strong\u003e 480V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e E43M040\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhy this matters: using the correct E43M040 ensures your protection coordination remains intact, trip characteristics stay predictable, and your system continues to meet safety and code requirements. This isn’t a generic breaker—it's the Siemens part designed to align with the electrical architecture of compatible panels and distributions, minimizing downtime and misfit issues during maintenance or upgrades.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eIdeal use cases\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eMaintenance and replacements:\u003c\/strong\u003e Standby-ready for aging or failed breakers in existing Siemens installations.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRetrofit projects:\u003c\/strong\u003e Upgrade or reconfigure panel banks to maintain consistent protection across downstream circuits.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNew installations in compatible systems:\u003c\/strong\u003e When your design specifies Siemens E43M040, you gain matched performance and warranty support.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eElectrical safety upgrades:\u003c\/strong\u003e Ensure consistent trip settings and fault isolation for multi-zone manufacturing lines and critical power feeds.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eCompatibility and installation guidance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eAlways verify fit and ratings before ordering. The \u003cstrong\u003eE43M040\u003c\/strong\u003e part number is the most reliable reference for compatibility.\u003c\/li\u003e \u003cli\u003eCross-check your system’s amperage, voltage, and pole requirements against the 40A, 3-Pole, 480V specification.\u003c\/li\u003e \u003cli\u003eEnsure the breaker style suits your panel or switchgear and that bus connection geometry matches your enclosure's design.\u003c\/li\u003e \u003cli\u003eInspect panel labeling and documentation to confirm Siemens OEM parts are approved for use within your electrical distribution.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eWhat to expect in operation\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWith this Siemens circuit breaker, you gain precise overcurrent protection that helps prevent equipment damage and electrical fires, while enabling straightforward maintenance cycles. Its robust build supports reliable operation in environments where continuous uptime matters—manufacturing floors, data-center rooms, and large commercial installations alike.\u003c\/p\u003e \u003cp\u003ePro tip: treat this as an OEM replacement to preserve warranty coverage and ensure seamless compatibility with existing Siemens protection schemes. For best results, carry out a quick compatibility check against your panel's part references and confirm the E43M040 is the exact fit for your specific model and bus arrangement.\u003c\/p\u003e \u003cp\u003eReady for dependable protection that aligns with your Siemens-based electrical ecosystem? Add the Siemens E43M040 Circuit Breaker to your cart and proceed with a precise, manufacturer-approved replacement that keeps your system safe and compliant.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46426679476386,"sku":"E43M040","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_16d3a2fb-5d93-424c-9206-5031ec4b178f.png?v=1765492977","url":"https:\/\/www.ampstate.com\/products\/siemens-e43m040-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}