{"product_id":"siemens-ngb3b040b-40a-600v-3-pole-bolt-on-circuit-breaker","title":"Siemens NGB3B040B - 40 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens NGB3B040B—a 3-pole, 40A, 600V bolt-on molded case circuit breaker engineered to deliver dependable branch-circuit protection in panelboards and load centers. Built for environments that demand reliability, this unit combines rugged mechanical design with precise electrical protection to keep electrical systems safe and operational.\u003c\/p\u003e \u003ch2\u003eWhy this breaker stands out\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e provides a rigid, vibration-resistant bus connection, reducing connector wear and maintaining consistent electrical contact over time.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection performance, responding predictably to both overloads and short circuits across a range of temperatures and loads.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible design\u003c\/strong\u003e is built to work seamlessly with matching Siemens load centers and panelboards, simplifying replacements and upgrade projects.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile applications\u003c\/strong\u003e suitable for residential, commercial, and light industrial electrical systems, making it a reliable choice for a variety of panel configurations.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eKey specifications at a glance\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 NGB3B040B\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage rating:\u003c\/strong\u003e 40A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating:\u003c\/strong\u003e 600V\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\u003ePractical use cases and benefits\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNew installations\u003c\/strong\u003e: Install as part of a 3-phase panelboard or load center to provide immediate, reliable protection for each branch circuit.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePanelboard upgrades\u003c\/strong\u003e: Replace older or worn breakers with a bolt-on Siemens solution to improve mechanical stability and protection performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIndustrial-light environments\u003c\/strong\u003e: Ideal for service panels and distribution gear in light industrial settings where vibration resistance and solid connections matter.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eResidential and commercial applications\u003c\/strong\u003e: Suitable for homes, retail spaces, and small offices that require dependable protection without frequent nuisance trips.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eHow this compares to typical breakers\u003c\/h2\u003e\n\u003cp\u003eUnlike plug-in variants, the bolt-on design of the NGB3B040B delivers a sturdier attachment to the bus bars, reducing movement under vibration and improving long-term contact reliability. The thermal-magnetic trip mechanism offers a proven balance between fast short-circuit response and stable overload protection, helping to minimize downtime and protect connected equipment.\u003c\/p\u003e \u003ch2\u003eInstallation and care tips\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eEnsure you are pairing this unit with matching Siemens OEM panelboards or load centers for guaranteed compatibility and performance.\u003c\/li\u003e \u003cli\u003eProperly secure the breaker to achieve the full benefits of the bolt-on design—this minimizes vibration-related wear and maintains solid electrical contact.\u003c\/li\u003e \u003cli\u003eFollow standard electrical safety practices during installation, and verify the system is de-energized before replacement or mounting.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eFor reliable, industry-grade overcurrent and short-circuit protection in panelboards and load centers, the Siemens NGB3B040B 40A, 600V, 3-pole bolt-on molded case circuit breaker delivers precise protection, durable construction, and OEM‑level compatibility—making it a dependable choice for both upgrades and new installations. Available from AmpState, your source for Siemens protection solutions.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355138674850,"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_799dc6b0-9e06-4f14-ba1d-d46e63fe1f4a.png?v=1764689585","url":"https:\/\/www.ampstate.com\/products\/siemens-ngb3b040b-40a-600v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}