{"product_id":"siemens-ed42b125-125a-480v-2-pole-bolt-on-circuit-breaker","title":"Siemens ED42B125 - 125 A, 480 V, 2-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens ED42B125, a dependable 2-pole bolt-on molded case circuit breaker engineered to safeguard branch circuits in panelboards and load centers. Rated at 125A and 480V, this device is designed to deliver precise overcurrent and short-circuit protection where reliability matters most—from residential service panels to light commercial and industrial applications.\u003c\/p\u003e \u003ch3\u003eWhy this 2-pole bolt-on breaker stands out\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e ensures a rigid, vibration-resistant bus connection, reducing movement that can affect protection performance over time.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e provides stable, repeatable protection across a broad range of loads and fault conditions, helping you avoid nuisance trips while still delivering fast fault clearing.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible design\u003c\/strong\u003e is built to align with matching Siemens panelboards and other OEM load centers, simplifying replacement and service workflows.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application\u003c\/strong\u003e suitable for residential, commercial, and light industrial environments where robust branch circuit protection is essential.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eTechnical specifications at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eManufacturer: Siemens\u003c\/li\u003e \u003cli\u003ePart Number: ED42B125\u003c\/li\u003e \u003cli\u003eType: Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003eAmperage Rating: 125A\u003c\/li\u003e \u003cli\u003eVoltage Rating: 480V\u003c\/li\u003e \u003cli\u003eNumber of Poles: 2\u003c\/li\u003e \u003cli\u003eMounting Style: Bolt-on\u003c\/li\u003e \u003cli\u003eApplication: Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal use cases and scenarios\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eUpgrading or expanding residential service panels where a reliable 125A, 480V protection solution is required.\u003c\/li\u003e \u003cli\u003eRetrofitting commercial or light industrial load centers that demand a rugged bolt-on mount and stable trip characteristics.\u003c\/li\u003e \u003cli\u003eReplacing aging or worn breakers in existing Siemens panelboards to maintain consistent protection performance.\u003c\/li\u003e \u003cli\u003eFeeding critical branch circuits where vibration or environmental conditions could impact bus integrity without a secure connection.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eInstallation, compatibility, and practical tips\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eChoose the ED42B125 when your panelboard specifies a bolt-on molded case breaker to ensure proper fit and reliable engagement with the bus bar.\u003c\/li\u003e \u003cli\u003eConfirm the panelboard’s OEM compatibility to streamline replacement and reduce downtime during service events.\u003c\/li\u003e \u003cli\u003eFollow standard electrical safety practices during installation, paying particular attention to torque requirements for bolt-on mounting to preserve the integrity of the bus connection.\u003c\/li\u003e \u003cli\u003eUse this 125A, 2-pole device as a main or feeder protection option in appropriate Siemens-panelboard configurations to protect conductors and downstream equipment from overcurrent conditions.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWith the Siemens ED42B125, you’re choosing a purpose-built solution that blends rigorous protection with straightforward installation. It’s more than a breaker—it’s part of a reliable protection strategy for your electrical distribution, designed to keep circuits safe and systems up and running.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349789233314,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens_breaker_and_panel_d17f1719-17af-40ee-95cd-c5e7b7be5c50.png?v=1764156803","url":"https:\/\/www.ampstate.com\/products\/siemens-ed42b125-125a-480v-2-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}