{"product_id":"siemens-b345hh-45a-240v-3-pole-bolt-on-circuit-breaker","title":"Siemens B345HH - 45 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003eSiemens B345HH – 45 A, 240 V, 3-Pole Bolt-On Circuit Breaker from AmpState \u003cp\u003eThe Siemens B345HH is a 45A, 240V, 3-pole bolt-on molded case circuit breaker designed to protect your electrical system with precision and reliability. Built for dependable branch circuit overcurrent and short-circuit protection, it integrates smoothly into panelboards and load centers used in residential, commercial, and light industrial settings.\u003c\/p\u003e \u003ch3\u003eWhy this breaker stands out\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cb\u003eSecure bolt-on mounting\u003c\/b\u003e—a rigid, vibration-resistant bus connection that stays tight through equipment starts and shutdowns, reducing the risk of loose connections over time.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eThermal-magnetic trip unit\u003c\/b\u003e—delivers stable, repeatable protection performance across a wide range of loads and fault conditions, helping to prevent nuisance tripping while still safeguarding circuits.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eOEM-compatible design\u003c\/b\u003e—works with matching Siemens OEM load centers and panelboards for straightforward installation and dependable system integration.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eVersatile, three-pole protection\u003c\/b\u003e—ideal for three-phase distribution in residential, commercial, and light industrial environments, where reliable phase protection is essential.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eKey technical specifications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cb\u003eManufacturer:\u003c\/b\u003e Siemens\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003ePart Number:\u003c\/b\u003e B345HH\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eType:\u003c\/b\u003e Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eAmperage Rating:\u003c\/b\u003e 45 A\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eVoltage Rating:\u003c\/b\u003e 240 V\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eNumber of Poles:\u003c\/b\u003e 3\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eMounting Style:\u003c\/b\u003e Bolt-on\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eApplication:\u003c\/b\u003e Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003ePractical use cases\u003c\/h3\u003e\n\u003cp\u003eWhether you’re upgrading an aging panel or specifying a new installation, the B345HH provides robust protection for three-phase circuits. It’s well-suited for:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eResidential subpanels feeding critical electrical rooms or heat pumps where three-phase protection is required\u003c\/li\u003e \u003cli\u003eCommercial service entrance panels and small to mid-size load centers\u003c\/li\u003e \u003cli\u003eLight industrial equipment circuits where reliable trip performance under fault conditions is essential\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eHow it helps your project\u003c\/h3\u003e\n\u003cp\u003eChoosing a bolt-on molded case breaker like the B345HH delivers a compelling combination of mechanical durability and electrical protection. The bolt-on interface creates a solid mechanical connection that resists vibration, while the thermal-magnetic trip unit provides fast, predictable responses to overloads and short circuits. Coupled with OEM panel compatibility, this breaker minimizes installation surprises and simplifies maintenance over the life of the system.\u003c\/p\u003e \u003ch3\u003eInstallation and integration tips\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003ePair with Siemens OEM load centers and panelboards to ensure optimal fit and coordinated protection schemes.\u003c\/li\u003e \u003cli\u003eVerify three-phase circuit requirements and ensure the 240 V rating aligns with your distribution setup.\u003c\/li\u003e \u003cli\u003eMount securely in a compatible panelboard using the bolt-on method to maintain a stable electrical path and reduce vibration-induced wear.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349754859682,"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_48761847-65c6-40e9-afb6-e9c652e885f5.png?v=1764155953","url":"https:\/\/www.ampstate.com\/products\/siemens-b345hh-45a-240v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}