{"product_id":"siemens-lgb3b125b-125a-600v-3-pole-bolt-on-circuit-breaker","title":"Siemens LGB3B125B - 125 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eSiemens LGB3B125B is a 3-pole, 125 A molded case circuit breaker engineered for reliable branch-circuit overcurrent and short-circuit protection in panelboards and load centers. Its bolt-on design delivers a secure, vibration-resistant connection to bus bars, while the thermal-magnetic trip unit provides stable, repeatable protection in demanding environments. Compatible with matching Siemens OEM load centers, this device is a practical, code‑compliant choice for residential, commercial, and light industrial electrical distribution.\u003c\/p\u003e \u003ch2\u003eKey Benefits\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e creates a rigid, vibration‑resistant connection to the bus, reducing movement and wear over time.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip\u003c\/strong\u003e combines a thermal element for overload protection with a magnetic element for short-circuit events, delivering fast, predictable trips and minimizing nuisance activations.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible\u003c\/strong\u003e designed to pair with Siemens load centers and panelboards for seamless integration, code compliance, and reliable performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThree-pole configuration\u003c\/strong\u003e ideal for balanced three‑phase distribution in commercial and light industrial applications.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e600 V rating\u003c\/strong\u003e supports a wide range of industrial and commercial electrical networks, ensuring solid protection for higher voltage systems.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e125 A protection\u003c\/strong\u003e appropriate for feeder and branch-circuit protection in mid‑to‑large installations.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eTechnical Details\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Siemens\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e LGB3B125B\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Thermal-magnetic molded case circuit breaker (MCCB)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage Rating:\u003c\/strong\u003e 125 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage Rating:\u003c\/strong\u003e 600 V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 3\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting Style:\u003c\/strong\u003e Bolt-on\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eIdeal Applications\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eResidential, commercial, and light industrial panelboards and load centers requiring reliable 3‑phase protection.\u003c\/li\u003e \u003cli\u003eUpgrading aging or undersized MCCBs to ensure safer distribution for feeders and subpanels.\u003c\/li\u003e \u003cli\u003eNew installations where a robust, code‑compliant bolt-on MCCB is preferred for long-term durability in vibration-prone environments.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eInstallation and Use Considerations\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eUse with Siemens OEM panelboards and load centers to guarantee full electrical compatibility and protection coordination.\u003c\/li\u003e \u003cli\u003eEnsure correct mounting and secure connections to achieve the vibration resistance that the design promises.\u003c\/li\u003e \u003cli\u003eFollow Siemens installation guidelines for wiring, torque, and protection coordination to maximize performance and safety.\u003c\/li\u003e \u003cli\u003eIdeal for systems where fast short-circuit response is critical, as the magnetic trip helps interrupt fault currents promptly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349822656674,"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_c752c6fd-847c-4976-b902-2bb45f230cae.png?v=1764157750","url":"https:\/\/www.ampstate.com\/products\/siemens-lgb3b125b-125a-600v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}