Overview
The Cutler-Hammer C300CN3 /A2 overload relay is a proven electromechanical protection device for industrial motor circuits. This Size 1 relay is rated for 30 amps and features a eutectic alloy thermal element design that delivers reliable overload tripping. The panel-mount configuration integrates seamlessly into motor starters and control centers. The /A2 series variant offers long contact extension options for flexible installation requirements.
Key Features
- 30-amp continuous current rating with standard trip characteristics
- Eutectic alloy overload element for consistent thermal response
- Size 1 frame compatible with most Cutler-Hammer motor starters
- Panel-mount design for direct MCC (Motor Control Center) installation
- Series A2 construction for extended contact reach applications
- Open-type housing requiring no external enclosure
Technical Specifications
The C300CN3 is engineered to NEMA standards for motor circuit protection in industrial environments. Key operational parameters include the standard trip (ST) characteristic curve, which provides coordinated response with contactor coils and auxiliary contacts. The relay operates across standard industrial voltage ranges typical of North American and international installations. Contact blocks and auxiliary contact kits are available as renewal parts for field upgrades or maintenance.
Typical Applications
- AC motor protection in industrial machinery
- Pump and compressor starter circuits
- HVAC motor circuits and fan applications
- Conveyor system drive protection
- Machine tool motor overload protection
Compatibility & Replacements
Compatible With
- Cutler-Hammer Size 1 motor starters and contactors
- Cutler-Hammer motor control centers (MCC) Size 1 buckets
- Eaton IT Electro-Mechanical full-voltage and reversing contactors
- NEMA-standard full-voltage starter configurations
- Auxiliary contact blocks and renewals for Series A and A2
Replaces / Drop-In Replacement For
The C300CN3 /A2 replaces earlier Cutler-Hammer overload relays in Size 1 applications where 30-amp protection is required. Verify your existing contact block selection and frame size against Cutler-Hammer documentation to confirm compatibility before installation. Direct substitution is possible only if the original unit uses identical contact block and amperage configuration.
Works With
- Cutler-Hammer contact blocks and renewal kits (Series A, A2)
- Eaton auxiliary contact attachment options
- Standard NEMA motor starter enclosures and starter combination units
- Manual and magnetic full-voltage starters
