{"product_id":"hhfxd63b175-siemens-molded-case-circuit-breaker-bolt-on-175-amp-3-pole-600-volt","title":"Siemens HHFXD63B175 Molded Case Circuit Breaker | 175A 3-Pole 600V Bolt-On","description":"\u003ch2\u003eSiemens HHFXD63B175 — 175 Amp Molded Case Circuit Breaker\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eSiemens HHFXD63B175\u003c\/strong\u003e is a heavy-duty, 3-pole thermal magnetic molded case circuit breaker engineered for demanding commercial and industrial power distribution applications. Part of Siemens' trusted \u003cstrong\u003eSentron Series FD Frame\u003c\/strong\u003e lineup, this breaker delivers ultra-high interrupting capacity and reliable overcurrent protection in a bolt-on form factor.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e HHFXD63B175\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Siemens (Sentron Series)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFrame Type:\u003c\/strong\u003e FD Frame (HHFXD)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCurrent Rating:\u003c\/strong\u003e 175 Amperes at 40°C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage Rating:\u003c\/strong\u003e 600 VAC (50\/60 Hz) | 500 VDC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 3-Pole \/ 3-Phase\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInterrupting Rating:\u003c\/strong\u003e 100 kAIC at 480V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTrip Type:\u003c\/strong\u003e Thermal Magnetic — LI (Long-Time \u0026amp; Instantaneous)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConnection Type:\u003c\/strong\u003e Bolt-On\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTrip Unit:\u003c\/strong\u003e Non-Interchangeable\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e UL 489 Listed\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 9.50 in (L) × 4.50 in (W) × 4.0 in (D)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e HHFXD63B175-N\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose the HHFXD63B175?\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eHHFXD\u003c\/strong\u003e prefix designates Siemens' \u003cem\u003ehighest interrupting capacity\u003c\/em\u003e within the FD Frame series — making the HHFXD63B175 the go-to choice when fault current levels demand maximum protection. With a \u003cstrong\u003e100 kAIC interrupting rating at 480V\u003c\/strong\u003e, this breaker handles extreme short-circuit conditions found in large commercial buildings, data centers, manufacturing facilities, and industrial switchgear assemblies.\u003c\/p\u003e\n\n\u003cp\u003eThe \u003cstrong\u003ethermal magnetic trip mechanism\u003c\/strong\u003e provides a dual-layer of protection: the thermal element responds to sustained overloads, while the magnetic element provides instantaneous trip response to high-magnitude fault currents — preventing equipment damage and reducing arc flash risk.\u003c\/p\u003e\n\n\u003ch2\u003eIdeal Applications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eCommercial and industrial panelboards\u003c\/li\u003e\n  \u003cli\u003eSiemens P2, P3, S4, and S5 panelboard systems\u003c\/li\u003e\n  \u003cli\u003eMotor control centers (MCCs)\u003c\/li\u003e\n  \u003cli\u003eDistribution switchgear and switchboards\u003c\/li\u003e\n  \u003cli\u003eData centers and critical power infrastructure\u003c\/li\u003e\n  \u003cli\u003eHigh-fault-current environments requiring 100 kAIC protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eSiemens HHFXD63B175 circuit breaker (new condition)\u003c\/li\u003e\n  \u003cli\u003eNon-interchangeable thermal magnetic trip unit\u003c\/li\u003e\n  \u003cli\u003eLoad side lug terminals\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat does HHFXD mean in the Siemens part number?\u003c\/strong\u003e\u003cbr\u003e\nIn Siemens' FD Frame naming convention, \"HH\" indicates the highest interrupting capacity tier. \"FXD\" refers to the frame type with bolt-on mounting. Together, HHFXD signifies maximum fault-clearing capability — in this case, 100 kAIC at 480V.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between HHFXD63B175 and HFXD63B175?\u003c\/strong\u003e\u003cbr\u003e\nThe HFXD63B175 is rated for 65 kAIC at 480V. The HHFXD63B175 provides a higher 100 kAIC interrupting rating, making it the correct choice for installations where fault current analysis indicates levels exceeding 65 kA.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs the HHFXD63B175 UL Listed?\u003c\/strong\u003e\u003cbr\u003e\nYes. This breaker is UL 489 Listed and conforms to applicable ANSI\/NEMA standards for molded case circuit breakers.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat connection type does this breaker use?\u003c\/strong\u003e\u003cbr\u003e\nThe HHFXD63B175 uses a bolt-on connection, ensuring a secure, low-resistance mechanical and electrical connection within the panelboard or switchgear assembly.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat panelboards is it compatible with?\u003c\/strong\u003e\u003cbr\u003e\nThis breaker is compatible with Siemens P2, P3, S4, and S5 panelboard series that accept FD Frame bolt-on breakers.\u003c\/p\u003e","brand":"Siemens","offers":[{"title":"New","offer_id":48396206866680,"sku":"HHFXD63B175-N","price":1351.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/1209\/3176\/files\/Photoroom_20260211_001408.jpg?v=1778795164","url":"https:\/\/alphabreakersandcontrols.com\/products\/hhfxd63b175-siemens-molded-case-circuit-breaker-bolt-on-175-amp-3-pole-600-volt","provider":"Alpha Breakers \u0026 Controls","version":"1.0","type":"link"}