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Siemens HJD63F400

Product Name Sentron HJD-Frame Molded Case Circuit Breaker (MCCB)

Product Description The HJD63F400 is a 3-pole high-interrupting capacity molded case circuit breaker from Siemens Sentron JD series. It features a thermal-magnetic trip unit that provides long-time overload protection and instantaneous short-circuit protection for industrial power distribution and motor control circuits.

Category:
Description

Technical Specifications

  • Frame: HJD6 (High Interrupting JD frame)
  • Poles: 3 poles
  • Rated current: 400 A
  • Rated voltage: 600 V AC
  • Interrupting capacity: 65 kA at 480 V AC; 35 kA at 600 V AC
  • Trip unit type: Thermal-magnetic (fixed thermal, adjustable magnetic)
  • Mounting style: Bolt-on
  • Wire range: 3/0 AWG – 500 kcmil (copper); 4/0 AWG – 500 kcmil (aluminum)
  • Standards: UL 489, IEC 60947-2

Functional Features

  • High short-circuit interrupting rating for heavy industrial power systems
  • Thermal-magnetic trip provides both overload and instantaneous fault protection
  • Line and load side lugs included for flexible installation orientation
  • Compact JD frame footprint optimizes panel space
  • Interchangeable trip units for system configuration flexibility
  • Reinforced molded case provides electrical insulation and mechanical durability

Application Scenarios

  • Industrial main distribution panels and switchboards
  • Motor control center feeder protection
  • Heavy machinery and equipment circuit protection
  • Commercial and industrial building electrical systems
  • Renewable energy power distribution systems

Installation Requirements

  • Install in vertical upright orientation on panel or busbar
  • Torque line and load terminals to Siemens specified values
  • Maintain minimum clearance around breaker for heat dissipation
  • Use correctly sized copper or aluminum conductors with compatible lugs

Operating Notes

  • Do not apply voltage or current exceeding nameplate ratings
  • Inspect terminals periodically for tightness and signs of overheating
  • Do not modify or adjust trip unit settings beyond rated limits
  • Perform periodic trip testing per electrical maintenance schedules
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