Overview
The Eaton Cutler Hammer C316FNA3 is a bimetallic thermal overload relay designed for motor and load protection in industrial automation systems. With Class 10A trip classification and ambient temperature compensation, this Series A2 relay automatically adjusts trip characteristics based on ambient conditions, ensuring consistent protection across varying operating environments. The C316FNA3 is a field-proven component used in manufacturing, food processing, HVAC, and general industrial machinery applications.
Key Features
- Class 10A Trip Rating: Fast-acting protection that responds within 10 seconds at 600% of nominal current
- Ambient Compensation: Automatic thermal adjustment maintains performance in temperature-sensitive installations
- Adjustable Trip Current: Multiple current ranges available via suffix designation for flexible motor sizing
- Bimetallic Design: Durable dual-metal construction proven in harsh industrial environments
- High Impulse Withstand Voltage: 6 kV impulse rating resists electrical transients and surges
Technical Specifications
- Manufacturer: Eaton Corporation (Cutler-Hammer Division)
- Model Series: A2 Thermal Overload Relay
- Trip Classification: Class 10A (10-second trip time at 600% rated current)
- Rated Insulation Voltage (Ui): 690 V AC
- Impulse Withstand Voltage (Uimp): 6 kV
- Relay Type: Thermal bimetallic, ambient compensated
- Contact Configuration: N.C. 10A rated, N.O. auxiliary contacts available
- Trip Adjustment: 125% of full load current (FLC)
- Operating Principle: Heat-sensitive bimetallic strip with manual and auto reset options
Typical Applications
The C316FNA3 is commonly used in the following applications:
- Three-phase AC induction motor protection (fractional to medium HP)
- Pump and fan motor circuits
- Conveyor and material handling systems
- Compressor and refrigeration equipment control
- Machine tool and industrial machinery starters
- HVAC equipment protection in commercial buildings
Compatibility & Replacements
Compatible With
- Eaton CE15 contactors and magnetic starters
- Eaton Cutler-Hammer A-Series contactors
- 3-phase AC motor circuits rated up to 690V
- IEC 60947-4-1 and IEC 60947-5-1 compliant control systems
Replaces / Drop-In Replacement For
The C316FNA3 comes in multiple current range variants (designated by suffix letters such as F, M, R, etc.). Verify the specific current range of your unit before ordering. Common current ranges include 1.3-1.9A, 1.7-2.4A, 2.2-3.4A, 2.8-4A, 4.5-6.5A, 13-19A, and 18-24A. Consult with your system integrator or refer to Eaton documentation to confirm direct replacement compatibility with legacy models.
Works With
- Eaton Freedom Series contactors and control devices
- IEC-compliant motor starters and soft starters
- Traditional electromechanical control panels
- Manual and automatic motor protection schemes
