CUTLER HAMMER JD3250F – Industrial Molded Case Circuit Breaker Frame

Description

1. Mechanical & Physical:
   • Enclosure Compatibility: NEMA 1/3R/4X (dust/weather-resistant)
   • Mounting: Fixed or draw-out installation in switchgear/MCCs
   • Terminals: Copper alloy lugs for 600V cable termination
   • Weight: ~15–20 kg (typical for 250A frame)
2. Standards Compliance:
   • Certifications: UL 489, CSA C22.2, IEC 60947-2
   • Environmental: Operating temperature: -25°C to +60°C

Functional Features

1. Robust Protection:
   • Adjustable Trip Settings: Fine-tune thermal/magnetic thresholds for motor/transformer loads
   • Zone-Selective Interlocking (ZSI): Coordinates with upstream/downstream breakers to minimize outage scope
2. Operational Flexibility:
   • Interchangeable Trip Units: Upgrade to digital modules (e.g., Digitrip RMS 510) for energy monitoring
   • Accessories: Shunt trip (e.g., HFD3080L), auxiliary switches (A2X3PK), and padlock provisions
3. Safety & Diagnostics:
   • Arc Flash Reduction: Integrated with ARMS technology to reduce incident energy
   • Status Indicators: LED alarms for trip causes (overload, short circuit)

Application Scenarios

1. Industrial Power Distribution:
   • Motor Control Centers (MCCs): Protects 150–250HP motors in manufacturing lines (e.g., automotive robotics)
   • Transformer Protection: Primary/secondary protection for 75–500 kVA transformers ()
2. Critical Infrastructure:
   • Oil & Gas: Pipeline pump stations (600V/250A circuits) and refinery valve networks
   • Water Treatment: Main feeder protection for 480V pump drives
3. Renewable Energy:
   • Solar Farms: Combiner box overcurrent protection for inverters ≥150kW

Compatibility & Integration

1. Panel Integration:
   • Compatible with Cutler Hammer Pow-R-Line switchgear (e.g., PRL2a panels)
   • Fits Eaton AN56DNO contactors for starter combinations
2. Retrofit & Upgrades:
   • Replaces legacy Westinghouse KD/JD series breakers
   • Accepts Digitrip RMS retrofit kits (e.g., RP6A16A080) for smart grid readiness

Maintenance & Safety

1. Installation:
   • Torque terminals to 50 lb-ft per NEC guidelines
   • Segregate from high-EMI sources (VFDs)
2. Testing Protocols:
   • Annual: Primary injection testing (validate 65kAIC)
   • Biannual: Mechanical exercise (reduce contact oxidation)
3. Troubleshooting:
   • False Tripping: Verify calibration of thermal trip settings
   • Contact Wear: Measure resistance (>50µΩ indicates replacement)

Certifications & Support

• Warranty: 5-year manufacturer coverage
• Global Service: Eaton-certified technicians (24/7 critical response)