{"product_id":"siemens-ef3a040-circuit-breaker","title":"Siemens | EF3A040 | Circuit Breaker | 40A | 3-Pole | 600V | Bolt-On","description":"\u003cdiv\u003e\n\u003cp\u003eSiemens EF3A040 Circuit Breaker is a robust 40 A, 3-Pole unit designed to protect demanding three‑phase electrical systems. With a 600V rating and a bolt‑on mounting style, this breaker delivers dependable overcurrent protection while enabling fast, secure installation in retrofit, maintenance, or replacement projects.\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 40 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3-Pole (three‑phase protection)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating:\u003c\/strong\u003e up to 600V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Bolt-On for solid, vibration‑resistant installation\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart reference:\u003c\/strong\u003e EF3A040 — use this number to verify compatibility with your panel\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApplications:\u003c\/strong\u003e maintenance, retrofit, and replacement in 3‑phase, 600V systems\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eThis Siemens circuit breaker is purpose-built for environments where reliable, long‑lasting protection matters. The 3‑pole design ensures balanced interruption across all three phases, helping prevent neutral or ground faults from propagating through your equipment. The bolt‑on configuration facilitates rapid field replacement and secure electrical contact, reducing installation time and downtime during panel upgrades or service work.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eWho benefits most\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eMaintenance teams performing reliable spare parts replacements in industrial panels\u003c\/li\u003e \u003cli\u003ePanel upgrade projects that require exact 3‑pole, 600V protection with a bolt‑on format\u003c\/li\u003e \u003cli\u003eRetrofit workflows where the EF3A040 aligns with existing Siemens or cross‑reference compatibility lists\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eWhy this configuration matters\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eThree‑phase protection:\u003c\/strong\u003e Keeps all phases synchronized, reducing the risk of imbalanced loads and equipment stress\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e600V capability:\u003c\/strong\u003e Suitable for higher‑voltage industrial circuits common in manufacturing, utilities, and large equipment feeds\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBolt‑on ease:\u003c\/strong\u003e Faster installation and secure mounting that stays put in vibration‑prone environments\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClear reference for compatibility:\u003c\/strong\u003e The EF3A040 part number is the most reliable cross‑reference when matching breakers to panels\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003ePractical installation and usage notes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eBefore ordering, confirm fit and ratings against your panel’s listing and the EF3A040 reference to ensure seamless compatibility\u003c\/li\u003e \u003cli\u003eUse the bolt‑on mounting method specified by Siemens for secure electrical contact and stable operation\u003c\/li\u003e \u003cli\u003eIn work orders, pair this unit with a compatible enclosure or panel backplane that supports 3‑pole 600V protection\u003c\/li\u003e \u003cli\u003eFor ongoing reliability, follow standard maintenance practices, inspect the mounting hardware, and verify connection integrity during routine service\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhether you’re replacing a failing breaker, upgrading a panel to handle higher‑demand three‑phase loads, or stocking a ready‑to‑go spare for rapid field service, the Siemens EF3A040 delivers precise protection, straightforward installation, and enduring performance in 600V, 3‑phase systems.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46427523252386,"sku":"EF3A040","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_ad06fdd7-931c-4a09-bfbe-d05329579cd6.png?v=1765492978","url":"https:\/\/www.ampstate.com\/products\/siemens-ef3a040-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}