{"product_id":"siemens-ed21b025-25a-120v-1-pole-bolt-on-circuit-breaker","title":"Siemens ED21B025 - 25 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eSiemens ED21B025\u003c\/strong\u003e is a 25A, 120V, 1-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit protection where it matters most. Built for use in panelboards and loadcenters, this unit combines rugged mounting with precise, thermal-magnetic trip operation to guard your electrical system against overcurrent and short circuits.\u003c\/p\u003e \u003ch2\u003eKey specifications\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage rating:\u003c\/strong\u003e 25A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating:\u003c\/strong\u003e 120V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 1\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting style:\u003c\/strong\u003e Bolt-on\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTrip type:\u003c\/strong\u003e Thermal-magnetic\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Molded case circuit breaker\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Siemens\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhy this breaker stands out\u003c\/h2\u003e\n\u003cp\u003eSecurity and reliability come first with the ED21B025. The secure bolt-on mounting creates a rigid, vibration-resistant connection to the bus, minimizing loosening risks in environments with equipment movement or cycling loads. The thermal-magnetic trip unit provides stable, repeatable protection across temperature fluctuations, reducing nuisance trips while still delivering fast response to real faults. And because it’s designed to be compatible with matching OEM loadcenters and panelboards, you can trust consistent performance and straightforward installation in your existing Siemens ecosystem.\u003c\/p\u003e \u003ch2\u003eIdeal use cases\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eResidential circuits such as lighting, outlets, or small appliance branches in new or upgraded panelboards\u003c\/li\u003e \u003cli\u003eCommercial distribution boards where reliable single-pole protection is required for individual circuits\u003c\/li\u003e \u003cli\u003eLight industrial environments needing compact, easy-to-install protection for auxiliary or non-critical loads\u003c\/li\u003e \u003cli\u003ePanelboard retrofits where part-number compatibility ensures quick replacement without wiring or configuration changes\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eCompatibility, installation, and practical considerations\u003c\/h2\u003e\n\u003cp\u003eFor best results, pair the ED21B025 with Siemens panelboards and loadcenters that specify compatible bolt-on molding and ED-series protection. This ensures a robust bus connection and synchronized protection characteristics across your distribution system. When installing, shut off mains power, follow the panelboard manufacturer’s torque and termination guidelines, and use the bolt-on mounting to secure the breaker per your enclosure’s requirements.\u003c\/p\u003e \u003ch2\u003eWhat you gain with the Siemens ED21B025\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eRigid, vibration-resistant mounting that preserves electrical integrity over time\u003c\/li\u003e \u003cli\u003eStable overcurrent and short-circuit protection through a reliable thermal-magnetic trip mechanism\u003c\/li\u003e \u003cli\u003ePlug-and-play compatibility with matching OEM Siemens loadcenters and panelboards\u003c\/li\u003e \u003cli\u003eClear, predictable protection for 25-amp circuits at 120V in a compact, one-pole form factor\u003c\/li\u003e \u003cli\u003eA practical, maintenance-light solution suitable for residential, commercial, and light industrial settings\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349784580258,"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_6da6e1e5-a17d-4171-842e-85064270233a.png?v=1764156606","url":"https:\/\/www.ampstate.com\/products\/siemens-ed21b025-25a-120v-1-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}