{"product_id":"siemens-bqd390-90a-480v-3-pole-bolt-on-circuit-breaker","title":"Siemens BQD390 - 90 A, 480 V, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eSiemens BQD390\u003c\/strong\u003e is a 3‑pole, 90 A bolt‑on molded case circuit breaker built to deliver dependable branch circuit overcurrent and short‑circuit protection in panelboards and loadcenters.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt‑on mounting\u003c\/strong\u003e creates a rigid, vibration‑resistant bus connection, helping maintain consistent electrical contact even in environments subject to mechanical movement or vibration.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal‑magnetic trip unit\u003c\/strong\u003e combines precise overload protection with instantaneous magnetic interruption for stable, repeatable response to varying loads and fault conditions.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM‑grade compatibility\u003c\/strong\u003e is designed to integrate smoothly with matching Siemens OEM load centers and panelboards, ensuring a cohesive protection system without compatibility worries.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3‑phase, 480 V operation\u003c\/strong\u003e makes it ideal for commercial and light industrial distributions, safeguarding multiple circuits in a single device.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile for multiple sectors\u003c\/strong\u003e suitable for residential, commercial, and light industrial applications where robust 3‑pole protection is required.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eUse cases and practical benefits:\u003c\/p\u003e \u003cul\u003e \u003cli\u003eProtects branch circuits feeding motors, lighting, HVAC, and other heavy loads in 480 V, 3‑phase systems, helping prevent damage from overcurrent and short circuits.\u003c\/li\u003e \u003cli\u003eThermal and magnetic coordination minimizes nuisance trips while delivering rapid protection during faults, reducing equipment downtime and maintenance costs.\u003c\/li\u003e \u003cli\u003eBolt‑on design supports secure, long‑term mounting in panelboards and loadcenters, contributing to reliable service life in demanding installation environments.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eTechnical specifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eManufacturer: Siemens\u003c\/li\u003e \u003cli\u003ePart number: BQD390\u003c\/li\u003e \u003cli\u003eType: Thermal‑magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003eAmperage rating: 90 A\u003c\/li\u003e \u003cli\u003eVoltage rating: 480 V\u003c\/li\u003e \u003cli\u003eNumber of poles: 3\u003c\/li\u003e \u003cli\u003eMounting style: Bolt‑on\u003c\/li\u003e \u003cli\u003eApplication: Branch circuit overcurrent and short‑circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eIdeal for electrical professionals and facilities teams seeking a reliable, OEM‑aligned protective device for 480 V 3‑phase panelboards. The Siemens BQD390 delivers predictable protection, easy integration with Siemens load centers, and a durable design that stands up to ongoing service in residential, commercial, and light industrial settings.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349769834658,"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_19c2f737-cf93-4c56-8bea-a1df1d93a84a.png?v=1764156274","url":"https:\/\/www.ampstate.com\/products\/siemens-bqd390-90a-480v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}