{"product_id":"siemens-bqd140-40a-277v-1-pole-bolt-on-circuit-breaker","title":"Siemens BQD140 - 40 A, 277 V, 1-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eThe Siemens BQD140 is a trusted choice for dependable branch circuit protection in panelboards and load centers. This 40A, 277V, 1-pole bolt-on molded case circuit breaker pairs robust construction with precise protection, making it a reliable backbone for commercial and light industrial electrical systems as well as residential applications where single-phase circuits matter most.\u003c\/p\u003e \u003ch2\u003eWhy the Siemens BQD140 stands out\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e delivers a rigid, vibration‑resistant bus connection that stays solid through constant operation and environment changes.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e provides stable, repeatable protection performance against both overcurrent and short circuits, helping prevent nuisance trips and equipment damage.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible design\u003c\/strong\u003e is built to work with matching Siemens OEM load centers and panelboards for a seamless, reliable electrical distribution system.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application\u003c\/strong\u003e suitable for residential, commercial, and light industrial settings—perfect for controlling single-phase branch circuits in a variety of environments.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eUse cases and applications\u003c\/h2\u003e\n\u003cp\u003eDesigned for single-pole protection, the BQD140 shines in scenarios where 277V circuits drive important equipment and lighting. Ideal uses include:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eCommercial lighting panels in offices, retail spaces, and schools that run on 277V single-phase distribution.\u003c\/li\u003e \u003cli\u003eLoad centers in small to mid-size commercial systems where space is at a premium and dependable protection is critical.\u003c\/li\u003e \u003cli\u003eResidential subpanels or mixed-use installations that require a reliable 40A, single-pole breaker with solid bus connections.\u003c\/li\u003e \u003cli\u003eLight industrial applications where vibration resistance and secure mounting improve long-term reliability.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eTechnical snapshot\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 BQD140\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:\u003c\/strong\u003e 40A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 277V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\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\u003eApplication:\u003c\/strong\u003e Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eInstallation and compatibility tips\u003c\/h2\u003e\n\u003cp\u003eTo maximize performance, pair the BQD140 with matching Siemens OEM load centers and panelboards designed for bolt-on breakers. The bolt-on mounting helps maintain a solid electrical connection in environments subject to vibration or movement, contributing to long-term reliability. Always follow local electrical codes and manufacturer installation guidelines to ensure safe, compliant operation.\u003c\/p\u003e \u003cp\u003eWhether upgrading an existing panel or configuring a new installation, the Siemens BQD140 delivers precise protection for critical single-phase circuits, combining robust construction with dependable protection you can trust.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349767803042,"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_c11b6de5-7c95-408c-9aa7-72a61b948e7c.png?v=1764156233","url":"https:\/\/www.ampstate.com\/products\/siemens-bqd140-40a-277v-1-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}