{"product_id":"siemens-hf3b040","title":"Siemens HF3B040 40A 600 V Circuit Breaker","description":"\u003cdiv\u003e\n\u003cp\u003eThe Siemens HF3B040 40A 600 V Circuit Breaker is a dependable line of overcurrent protection built to safeguard electrical panels and connected equipment in demanding industrial and commercial environments. With a 40 A rating and a 600 V maximum voltage, it delivers precise protection for your distribution circuits while keeping nuisance trips to a minimum.\u003c\/p\u003e \u003cp\u003eDesigned to fit Siemens panels that support the HF3B family, this part functions as a reliable, no-nonsense replacement that preserves trip characteristics and coordination with other protective devices in your system. Its robust construction and straightforward installation make it a practical choice for upgrading aging protection or stocking spare parts for critical infrastructure.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAccurate 40 A protection:\u003c\/strong\u003e Tailored to safeguard branch circuits from overloads and potential damage to wiring and equipment.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e600 V safety envelope:\u003c\/strong\u003e Suitable for higher-voltage distribution in commercial and light industrial settings.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic protection:\u003c\/strong\u003e Combines time-delayed overload protection with fast short-circuit trips for comprehensive safety.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDirect-fit replacement:\u003c\/strong\u003e Integrates smoothly with Siemens panels compatible with HF3B series breakers, helping maintain system integrity and coordination.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDurable, field-ready design:\u003c\/strong\u003e Built to withstand typical panel environments and provide long service life with minimal maintenance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClear application fit:\u003c\/strong\u003e Ideal for protecting control panels, distribution boards, and equipment circuits in industrial or commercial installations.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eUse cases and scenarios\u003c\/p\u003e \u003cp\u003eInstall the HF3B040 in panel boards that require reliable 40 A protection for circuits feeding motors, conveyors, lighting grids, or control systems. It’s a practical choice when upgrading from lower-rated breakers or replacing a failed unit in an existing Siemens HF3B-based installation. This model helps ensure consistent fault clearance and predictable behavior during electrical faults, minimizing downtime and equipment risk.\u003c\/p\u003e \u003cp\u003eSpecifications at a glance\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e HF3B040\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCurrent rating:\u003c\/strong\u003e 40 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating:\u003c\/strong\u003e 600 V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eProduct family:\u003c\/strong\u003e Siemens HF3B series circuit breakers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46423256826018,"sku":"HF3B040","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_229276d9-908d-46df-93e5-6fe31866e0ff.png?v=1765492975","url":"https:\/\/www.ampstate.com\/products\/siemens-hf3b040","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}