{"product_id":"siemens-qj3b12500s01-circuit-breaker","title":"Siemens | QJ3B12500S01 | Circuit Breaker | 125A | 3-Pole | 240V | Bolt-On","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens QJ3B12500S01 circuit breaker — a bolt-on, three-pole protection device engineered for demanding electrical environments. With a 125A rating at 240V, it delivers robust overcurrent protection where reliability is non-negotiable. This unit is ideal for maintenance, retrofit, and replacement projects that require exact specifications and a secure, durable connection.\u003c\/p\u003e \u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 125A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 240V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Bolt-On\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart reference:\u003c\/strong\u003e QJ3B12500S01\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWho should consider this breaker\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eElectrical professionals performing panel maintenance, retrofits, or replacements in Siemens systems\u003c\/li\u003e \u003cli\u003eMaintenance teams upgrading legacy installations that require a precise 3-pole, 125A, 240V bolt-on solution\u003c\/li\u003e \u003cli\u003eProject planners focusing on equipment longevity and consistent electrical protection across 3-phase circuits\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhat makes this unit stand out\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eExact-fit compatibility\u003c\/strong\u003e — the part number QJ3B12500S01 is the most reliable reference for compatibility with matching Siemens panels and bolt-on configurations.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e — designed to deliver a solid mechanical connection that remains dependable under vibration and load conditions common in industrial environments.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3-Pole protection\u003c\/strong\u003e for balanced, three-phase circuits, ensuring consistent interruption across all phases when faults occur.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eCompatibility and installation notes\u003c\/h3\u003e\n\u003cp\u003eBefore ordering, confirm fit and ratings for your specific panel or enclosure. The part number QJ3B12500S01 is the best reference to ensure seamless replacement. Because panel designs vary, verify that your enclosure supports bolt-on style breakers and that the 125A, 3-pole, 240V specifications match your system requirements.\u003c\/p\u003e \u003ch3\u003eUse cases and practical applications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eRetrofit an aging panel that uses bolt-on breakers with a modern, reliable Siemens solution\u003c\/li\u003e \u003cli\u003eReplace a worn or failed 125A, 3-pole breaker in 3-phase electrical distributions\u003c\/li\u003e \u003cli\u003eUpgrade maintenance electrical rooms or industrial control panels where space and mounting style require a bolt-on configuration\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eInstallation tips and best practices\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eInspect mounting surfaces for clean, undamaged contact points to preserve a secure connection\u003c\/li\u003e \u003cli\u003eEnsure proper alignment with panel bus bars prior to tightening bolts\u003c\/li\u003e \u003cli\u003eUse manufacturer-recommended torque values and check for proper tripping operation after installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46427419148450,"sku":"QJ3B12500S01","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-qj3b12500s01-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}