{"product_id":"square-d-fc34045-45a-3-pole-480v-i-line-molded-case-circuit-breaker-65kaic-plug-in","title":"Square D FC34045 – 45A 3-Pole 480V I-Line Molded Case Circuit Breaker | 65kAIC Plug-In","description":"\u003ch2\u003eSquare D FC34045 – 45 Amp Molded Case Circuit Breaker | I-Line Plug-In | 3-Pole | 480V | 65kAIC\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eSquare D FC34045\u003c\/strong\u003e is a heavy-duty, industrial-grade \u003cstrong\u003emolded case circuit breaker\u003c\/strong\u003e designed for demanding commercial and industrial power distribution applications. With a \u003cstrong\u003e45-amp current rating\u003c\/strong\u003e, \u003cstrong\u003e3-pole configuration\u003c\/strong\u003e, \u003cstrong\u003e480V AC voltage rating\u003c\/strong\u003e, and an exceptional \u003cstrong\u003e65kA interrupting capacity at 480V\u003c\/strong\u003e, this FC-frame breaker is engineered to deliver superior short-circuit protection and reliable thermal-magnetic trip performance in I-Line panelboards and switchboards.\u003c\/p\u003e\n\n\u003cp\u003eAs part of Schneider Electric's Square D I-Line family, the FC34045 features a \u003cstrong\u003eplug-in mounting style\u003c\/strong\u003e compatible with I-Line panelboards and switchboards — making installation faster and more convenient than bolt-on alternatives. Its \u003cstrong\u003eLong-Time and Instantaneous (LI) trip functions\u003c\/strong\u003e provide two-stage protection: gradual response to sustained overloads and near-instant reaction to high-level short-circuit faults.\u003c\/p\u003e\n\n\u003ch3\u003eKey Technical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel \/ Part Number:\u003c\/strong\u003e FC34045\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Square D \/ Schneider Electric\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 45A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage Rating:\u003c\/strong\u003e 480V AC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3-Pole \/ 3-Phase\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFrame Type:\u003c\/strong\u003e FC-Frame (FA-Frame series, 15–100A range)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMounting Style:\u003c\/strong\u003e I-Line Style Plug-In\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInterrupting Capacity:\u003c\/strong\u003e 65kA @ 480V (High Interrupting Capacity)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTrip Type:\u003c\/strong\u003e Thermal Magnetic – Long-Time and Instantaneous (LI)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e Calibrated at 40°C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePhase:\u003c\/strong\u003e 3-Phase\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e I-Line\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e UL Listed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat Is the Square D FC34045?\u003c\/h3\u003e\n\u003cp\u003eThe FC34045 is a \u003cstrong\u003ethermal-magnetic molded case circuit breaker (MCCB)\u003c\/strong\u003e manufactured by Square D (Schneider Electric). It uses a combination of a bimetallic strip (thermal element) for overload protection and an electromagnetic coil (magnetic element) for short-circuit protection — providing reliable, automatic fault detection without requiring an external power source or electronic components.\u003c\/p\u003e\n\n\u003cp\u003eThis breaker belongs to the \u003cstrong\u003eFC-Frame class\u003c\/strong\u003e within Square D's FA-Frame series, engineered for high interrupting duty in industrial switchgear and panelboards. The I-Line plug-in design allows the breaker to slide into compatible bus bars, significantly reducing installation time on new builds and breaker replacements.\u003c\/p\u003e\n\n\u003ch3\u003eApplications \u0026amp; Compatibility\u003c\/h3\u003e\n\u003cp\u003eThe Square D FC34045 is widely used across a range of commercial and industrial environments, including:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIndustrial facilities and manufacturing plants\u003c\/li\u003e\n  \u003cli\u003eCommercial buildings and office complexes\u003c\/li\u003e\n  \u003cli\u003eMotor branch circuit protection (3-phase motor loads)\u003c\/li\u003e\n  \u003cli\u003eHVAC systems and mechanical equipment rooms\u003c\/li\u003e\n  \u003cli\u003eLighting distribution panels\u003c\/li\u003e\n  \u003cli\u003eFeeder protection in I-Line panelboards and switchboards\u003c\/li\u003e\n  \u003cli\u003eData centers and utility rooms requiring high AIC ratings\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe breaker is compatible with Square D \u003cstrong\u003eI-Line panelboards and switchboards\u003c\/strong\u003e that accept FC-frame plug-in breakers. Always verify compatibility with your existing panel model before installation.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose the Square D FC34045?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Interrupting Capacity:\u003c\/strong\u003e 65kAIC @ 480V — exceeds standard breaker ratings, ideal for high-fault-current environments\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlug-In Convenience:\u003c\/strong\u003e I-Line style plug-in mounting simplifies installation and replacement\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Trip Protection:\u003c\/strong\u003e Long-Time and Instantaneous trip functions guard against both sustained overloads and sudden short circuits\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIndustry-Trusted Brand:\u003c\/strong\u003e Square D by Schneider Electric is a globally recognized leader in power management and circuit protection\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUL Listed:\u003c\/strong\u003e Complies with UL standards for safety and performance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3-Phase Capability:\u003c\/strong\u003e Designed for balanced protection across all three phases in commercial and industrial power systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat does FC34045 stand for?\u003c\/strong\u003e\u003cbr\u003e\nThe FC34045 part number encodes key specifications: \u003cem\u003eFC\u003c\/em\u003e = Frame type (FC-frame, high interrupting capacity variant of the FA series), \u003cem\u003e3\u003c\/em\u003e = 3-pole, \u003cem\u003e4\u003c\/em\u003e = 480V, \u003cem\u003e045\u003c\/em\u003e = 45-amp rating.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the interrupting rating of the FC34045?\u003c\/strong\u003e\u003cbr\u003e\nThe FC34045 has a \u003cstrong\u003e65kA interrupting capacity at 480V AC\u003c\/strong\u003e, classifying it as a high interrupting capacity breaker — suitable for environments with high available fault current.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat panels is the FC34045 compatible with?\u003c\/strong\u003e\u003cbr\u003e\nThe FC34045 uses an \u003cstrong\u003eI-Line style plug-in connection\u003c\/strong\u003e and is compatible with Square D I-Line panelboards and switchboards designed for FC-frame breakers. Refer to your panelboard's manufacturer specifications to confirm compatibility.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs the FC34045 the same as the FA34045?\u003c\/strong\u003e\u003cbr\u003e\nThey are related but differ in interrupting capacity. The FA34045 typically has an 18kA AIC rating at 480V, while the FC34045 offers a much higher 65kA AIC — making the FC series the preferred choice in high fault-current environments.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat trip mechanism does the FC34045 use?\u003c\/strong\u003e\u003cbr\u003e\nIt uses a \u003cstrong\u003ethermal-magnetic trip unit\u003c\/strong\u003e with Long-Time (LT) and Instantaneous (I) trip functions — providing two-layer protection against overloads and short circuits.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the operating temperature of the FC34045?\u003c\/strong\u003e\u003cbr\u003e\nThe FC34045 is calibrated for operation at \u003cstrong\u003e40°C ambient temperature\u003c\/strong\u003e. Derating may be required in higher temperature environments.\u003c\/p\u003e","brand":"Square D \/ Schneider Electric","offers":[{"title":"New","offer_id":48396209193208,"sku":"FC34045-N","price":599.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/1209\/3176\/files\/NeyTclXA-s-l1600.jpg?v=1778795222","url":"https:\/\/alphabreakersandcontrols.com\/products\/square-d-fc34045-45a-3-pole-480v-i-line-molded-case-circuit-breaker-65kaic-plug-in","provider":"Alpha Breakers \u0026 Controls","version":"1.0","type":"link"}