Westinghouse Thermal Overload Heater Element FH83

The Westinghouse Thermal Overload Heater Element FH83 is a critical component designed to safeguard electric motors from overheating due to excessive current. This heater element is specifically engineered for use with Type A and B overload relays in NEMA Size 3 and 4 enclosed starters.

Key Features

• Current Rating: Suitable for motors with a full load current (FLA) ranging from 56 to 61 amperes.
• Compatibility: Designed for integration with Type A and B overload relays, ensuring seamless operation within Westinghouse motor control systems.
• Trip Type: Thermal, fast-acting mechanism that promptly responds to overcurrent conditions, providing reliable motor protection.
• Approvals: Certified by UL and CSA, meeting stringent safety and performance standards.

Application Guidelines

When selecting the FH83 heater element, it’s essential to consider the motor’s full load current and service factor as indicated on the motor nameplate. For motors with a service factor of 1.15 to 1.25, the FH83 is appropriate for the specified current range. If the motor’s service factor is 1.0 or if enhanced protection is desired, choosing a heater element one size smaller than indicated is recommended.

Installation Considerations

Ensure that the ambient temperature conditions of both the motor and the controller are similar. If the controller’s ambient temperature is lower than the motor’s by 26°C, a smaller heater coil may be necessary. Conversely, if the controller’s ambient temperature is higher by 26°C, a larger heater coil might be required. The ultimate tripping current of the FH83 heater coil is approximately 1.25 times its minimum current rating, providing a buffer against transient overcurrent conditions.

By incorporating the Westinghouse FH83 Thermal Overload Heater Element into your motor control system, you ensure enhanced protection against overheating, thereby extending the operational lifespan of your equipment.