CUTLER HAMMER JD3250F – Industrial Molded Case Circuit Breaker Frame

Technical Specifications
Voltage Ratings: 600 VAC, 250 VDC
Current Rating: 250 A (frame only; trip unit ordered separately)
Poles: 3
Interrupting Capacity: 65 kA @ 240 VAC / 35 kA @ 480 VAC / 25 kA @ 600 VAC
Trip Functions: LI (Long-Time & Instantaneous) via field-installable trip units
Mounting: Bolt-on or plug-on; suitable for reverse feed
Standards: UL 489, CSA, IEC 60947-2
Dimensions: 4.13″ × 10″ × 4.06″ (H×W×D)
Weight: ~3.5 kg (frame only)

Category:
Description
Key Features
Patented blow-open contact design ensures rapid arc extinction and superior short-circuit performance
Interchangeable trip units allow on-site upgrades to electronic or adjustable magnetic types without replacing the frame
HACR rated for HVAC/R applications and suitable for reverse feed installations
Robust J-Frame construction withstands harsh industrial environments; proven 20+ year global installed base

Typical Applications
Power distribution: main and branch circuit protection in switchboards, panelboards, and motor control centers
Motor circuits: protection of pumps, compressors, conveyors up to 250 A
HVAC/R systems: chillers, cooling towers, large rooftop units
Renewable energy: inverter AC output protection in solar and wind farms
Oil & gas, mining, marine: rugged platforms requiring high interrupt ratings

Ordering Information
Frame Only: JD3250F (3-pole, 250 A frame) – trip unit ordered separately
Compatible Trip Units: TJD, LJD, EJD series thermal-magnetic or electronic types
Accessories: shunt trips, undervoltage releases, auxiliary switches, lug kits

Installation Notes
• Torque lugs to 275 lb-in (31 N·m) for aluminum/copper conductors
• Accepts wire sizes 1/0–500 kcmil (with appropriate lugs)
• Operating temperature −40 °C to +75 °C without derating
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