Offered for sale is an original ASEA Brown Boveri (ABB) Circuit Shield Synchronism Check Relay, Type 25S, Catalog Number 424J2105, designed for electrical power system protection and synchronizing applications. This industrial-grade electromechanical protection relay features adjustable Difference Volts and Time Delay settings, a Pickup indicator, Trip/Test selector, and Timer indicator for monitoring and synchronism checking operations. The unit comes with its original cardboard box marked Type 25S, Catalog Number 424J2105, and Serial Number 4906, along with additional hardware and mounting components as pictured. Manufactured by ASEA Brown Boveri in Allentown, Pennsylvania, USA, this is a specialized industrial electrical protection component suitable for maintenance, replacement, repair, or restoration of compatible switchgear and power control systems. Condition: Used, untested. The unit has not been electrically tested, and its operational condition is unknown. Please review all photographs carefully to verify the condition, included components, model, and compatibility before purchasing.
Specifications
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Brand: ASEA Brown Boveri (ABB)
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Product Type: Synchronism Check Relay
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Series / Type: Circuit Shield 25S
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Catalog / Part Number: 424J2105
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Serial Number: 4906
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Manufacturer: ASEA Brown Boveri
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Manufacturing Location: Allentown, Pennsylvania, USA
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Relay Rating: 1
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Difference Volts Adjustment: Approximately 20–60 volts
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Time Delay Adjustment: Approximately 0.5–1.5 seconds
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Controls: Pickup, Trip/Test selector, Timer
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Connection Type: Rear screw terminal block
Applications
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Electrical power system protection
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Generator synchronizing systems
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AC power synchronization monitoring
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Industrial switchgear installations
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Power distribution and control panels
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Electrical substation equipment
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Generator paralleling systems
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Industrial electrical maintenance and repair
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Replacement of compatible ABB Circuit Shield 25S relays
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