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The GE IC2820D300B7 is a specialized field loss relay designed to protect DC motors from overspeed conditions caused by a loss of the motor’s magnetic field. This particular model is rated for a 1.60A current.
Technical Breakdown 🧠
A field loss relay monitors the current in a DC motor’s field winding. If the field current drops below a preset threshold—indicating a “field loss” condition—the relay’s contacts change state. The IC2820D300B7 is designed to perform this vital protective function. When a field loss occurs, a DC motor can accelerate uncontrollably, potentially leading to catastrophic mechanical failure. This relay senses that condition and immediately trips, typically opening the main contactor to shut down the motor safely.
Rated for a specific 1.60A current, this relay is precisely configured for motors with low-current field windings, where the integrity of the motor’s field is critical for safe and stable operation.
Applications 🏭
The IC2820D300B7 is a fundamental safety device used in:
- DC Motor Control Panels: Protecting large DC motors in applications like cranes, rolling mills, and elevators.
- Industrial Drives: Ensuring the safe operation of variable-speed DC drives.
- Heavy Machinery: Providing field loss protection for DC motors in industries like mining, paper, and steel.
