Eaton HLDB3600FT33W

Product Name:​ Eaton / Cutler-Hammer HLDB Series Fixed-Mount Air Circuit Breaker with Micrologic 3.0 Trip Unit
Manufacturer:​ Eaton Corporation (formerly Cutler-Hammer)
Product Brief:​ Heavy-duty low-voltage air circuit breaker (ACB) intended for main incoming lines, bus ties, or large feeder circuits in industrial/commercial switchgear. Rated for 3600 A continuous with electronic microprocessor-based trip unit for selective coordination.
Category:
Description
Key Technical Specifications:
  • Frame Size:​ 4000 A frame, rated continuous current 3600 A (In = 3600 A)
  • Poles:​ 3-pole (3P)
  • Rated Operational Voltage (Ue):​ 600 V AC, 50/60 Hz
  • Rated Insulation Voltage (Ui):​ 1000 V AC
  • Impulse Withstand Voltage (Uimp):​ 8 kV
  • Breaking Capacity (Icu @ 600 V):​ 100 kA; Ics = 100 % Icu
  • Trip Unit:​ Micrologic 3.0 (LSI — Long-time, Short-time, Instantaneous protection)
    • Long-time pick-up Ir adjustable 0.4–1.0 × In
    • Short-time delay and pickup Isd adjustable
    • Instantaneous setting Ii adjustable 2–15 × In
  • Installation:​ Fixed (bolted) mount in switchgear; front-connected; horizontal/vertical busbar compatible
  • Mechanical Life:​ ≥ 10,000 operations
  • Electrical Life (@ rated):​ ≥ 2,000 operations
  • Standards:​ UL 489, CSA C22.2 No.5, IEC 60947-2, CE marked
  • Dimensions (approx.):​ W × H × D — refer to Eaton drawing for 3600 A fixed ACB (typical ~ 400 × 600 × 350 mm)
  • Enclosure Material:​ High-strength molded insulating housing with metal reinforcing brackets
Functional Features:
  • Microprocessor trip unit with LCD display (optional) showing load current and trip cause
  • Test port for handheld test set to verify trip functions without load
  • Draw-out version available in same family (this part is fixed type — FT33W denotes fixed, 3-pole, 600 V, Micrologic 3.0, W-suffix options)
Application Scenarios:​ Main distribution switchboard incoming, generator paralleling bus tie, large motor feeder protection in plants, data center PDU upstream protection.
Installation & Notes:
  • Must be installed by qualified electrical personnel; torque all busbar and termination bolts to Eaton-specified values.
  • Verify trip unit Ir setting matches actual continuous current rating before energizing.
  • Allow minimum clearance for arc venting as per IEC/ULrequirements.
  • Periodic inspection of contacts and lubrication per Eaton maintenance manual recommended.
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