Circuit Shield Type 25V 424K105 Synchronism Check Relay; 10sec, 120V Measure

Name: Circuit Shield Type 25V 424K105 Synchronism Check Relay

Function: Synchronism Check / Voltage Monitoring Relay

Timing: 10-second delay

Input: 120V measure

Overview:

The Circuit Shield Type 25V 424K105 is a synchronism check relay used in electrical power systems to verify that two AC voltage sources are in proper synchronism before they are connected together. It ensures that voltages, frequency, and phase angle are within acceptable limits so that parallel operation of generators or connection of loads can occur safely and without damage.

Key Features:

• Designed to measure 120 V AC input for voltage comparison

• Synchronism check function to compare phase relationship between two voltage sources

• Built-in 10-second delay timer to allow settling or controlled timing before relay action occurs

• Rugged industrial construction for reliable operation in control panels

• Provides a logic output to permit or block breaker operation based on synchronism criteria

Typical Uses:

• Generator paralleling systems

• Utility intertie protection

• Switchgear control logic

• Power system automation where synchronization must be verified before closing a breaker