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- SIEMENS HFD63F250 Molded Case Circuit Breaker
  
  Overview
  
  HFD63F250 belongs to Siemens Sentron series FD frame high interrupting capacity molded case circuit breaker (MCCB), bolt-on mounting type, 3-pole 250A thermal-magnetic trip breaker, widely used in North American industrial three-phase power distribution cabinets for main circuit and branch overload/short-circuit protection. It complies with UL489 and IEC60947-2 standards, features ultra-high short-circuit breaking capacity for heavy industrial loads.
  
  Key Specifications
  
  Electrical Parameters
  
  Poles: 3P three-phase
  
  Rated current: 250A frame
  
  Rated voltage: 600V AC / 500V DC
  
  Breaking capacity (AIC):
  
  65kA @ 480V AC
  
  25kA @ 600V AC
  
  Up to 100kA @ 240V AC
  
  Trip unit: Thermal-magnetic LI (long-time inverse time overload + instantaneous short-circuit protection), adjustable thermal & magnetic thresholds
  
  Connection: Line & load side lug terminal (TA1FD350A lugs optional)
  
  Wire range: Copper 6AWG–350KCM; Aluminum 4AWG–350KCM
  
  Operating temperature: Max 40°C rated ambient
  
  Mechanical & Structure
  
  Mounting method: Bolt-on fixed installation
  
  Overall dimension (W×H×D): 114mm × 241mm × 102mm (4.5 × 9.5 × 4 inch)
  
  Frame series: FD high breaking HFD series
  
  Protection grade: IP20 (cabinet internal use only)
  
  Expandable accessories: Auxiliary contact, alarm switch, shunt trip, undervoltage trip module
  
  Certification & Origin
  
  Certifications: UL Listed, cULus, CE, RoHS compliant
  
  Origin: Mexico
  
  Main Functions
  
  Dual thermal-magnetic comprehensive protection
  
  Thermal long delay: Protect cables, transformers, motors from continuous overload; adjustable setting for matching load rated current
  
  Magnetic instantaneous trip: Instant cut-off during short-circuit fault to avoid fire and equipment burnout
  
  High short-circuit isolation performance
  
  Ultra-high breaking capacity handles heavy short-circuit current in industrial power distribution systems, prevents arc flash damage in distribution cabinets
  
  Modular expandable auxiliary signal
  
  Optional auxiliary switch/alarm contact outputs fault signal to PLC/HMI for remote monitoring and fault alarm notification
  
  Universal power distribution control
  
  Serves as main incoming breaker or large motor feeder protection for three-phase industrial equipment
  
  Clear fault indication
  
  Built-in trip flag, visually distinguish manual switch-off and fault trip status for quick maintenance judgment
  
  Advantages
  
  Ultra-high 65kA breaking capacity at 480V, suitable for large factory power distribution with high short-circuit current
  
  Adjustable thermal-magnetic trip adapts to transformers, large pumps, fans and motor loads
  
  Bolt-on stable mounting structure resists vibration in heavy machinery workshops
  
  Large-capacity lug terminals support thick copper/aluminum cables for high-current power transmission
  
  Complete optional accessories realize remote tripping and fault signal feedback for intelligent power management
  
  Standard Sentron series unified size, convenient cabinet layout and spare part replacement