Westinghouse Style 1876904A Type C0-6 Overcurrent Relay

Description:

The Westinghouse Style 1876904A Type CO-6 is an electromechanical overcurrent relay designed to provide inverse-time overcurrent protection for electrical power systems. The relay operates using induction disc technology and monitors current through connected current transformers (CTs). When current exceeds preset pickup levels, the relay initiates a trip signal to operate associated circuit breakers and protect feeders, transformers, motors, and distribution circuits from overload and fault conditions. The CO-6 relay is commonly used in substations, switchgear, and industrial power distribution systems.

Applications:

The Westinghouse 1876904A CO-6 relay is commonly installed in utility substations, industrial plants, switchgear assemblies, motor control systems, and power generation facilities. It provides protective relaying for feeders, transformers, motors, and electrical distribution circuits by detecting abnormal current conditions and coordinating breaker tripping operations.

Technical Specifications:

• Manufacturer: Westinghouse Electric Corporation
• Part Number: 1876904A
• Product Type: Overcurrent Protection Relay
• Relay Type: Type CO-6
• Protection Function: Inverse-Time Overcurrent Protection
• Operating Principle: Electromechanical Induction Disc
• Input Type: Current Transformer (CT) Operated
• Function: Overload and fault current detection
• Application: Feeder, transformer, motor, and generator protection
• Mounting Type: Panel Mounted
• Installation Type: Protective relay assembly
• System Compatibility: Utility and industrial power systems
• Intended Use: Circuit breaker trip initiation during fault conditions
• Operating Environment: Industrial, commercial, and utility applications
• Performance Feature: Adjustable time-current characteristics for selective coordination and reliable fault protection

Common Replacements:

• ABB REF615 Protection Relay
• Siemens SIPROTEC 7SJ62 Relay
• Schneider Electric Easergy P3 Relay