General Electric 121AC51B1A Time Overcurrent Relay

General Electric 121AC51B1A Time Overcurrent Relay

The General Electric 121AC51B1A Time Overcurrent Relay is a dependable solution for safeguarding industrial and utility power systems against phase or ground overcurrent conditions. This single-phase, non-directional, current-sensitive AC device is engineered to deliver precise protection and control.

Key Features

• Inverse Time Characteristics: The relay’s operating time inversely correlates with the magnitude of the overcurrent, allowing for effective coordination with other protective devices.
• Robust Construction: Comprising a magnetic-core operating coil, induction disc, damping magnet, and mechanical target, the relay ensures reliable performance under various conditions.
• Instantaneous Overcurrent Unit: Equipped with a hinged-armature instantaneous overcurrent unit featuring an integral target for immediate response to severe overcurrent events.

Applications

• Feeder Protection: Safeguards electrical feeders from overcurrent scenarios, enhancing system reliability.
• AC Machines and Transformers: Provides essential protection for alternating current machinery and transformers against overcurrent damage.
• Overload Motor Protection: Effectively protects motors from overload conditions, preventing potential damage and downtime.

Specifications

• Time Overcurrent Unit: 4-16 Amperes
• Instantaneous Unit: 10-40 Amperes
• Frequency: 60 Hz

The General Electric 121AC51B1A Time Overcurrent Relay is an integral component for ensuring the safety and efficiency of electrical systems, offering precise protection tailored to various industrial applications.