Westinghouse 1875275A Overcurrent Relay 4-12A 3P Indicator 0.2-2 Amps

Description:

The Westinghouse 1875275A is a Type CO-8 electromechanical overcurrent relay designed to provide inverse-time overcurrent protection for feeders, transformers, motors, and power distribution circuits. This relay operates from current transformer inputs and features dual current ranges of 0.2–2 Amps and 4–12 Amps, along with a 3-position target and trip indicator. It detects overload and fault conditions and initiates breaker tripping to protect electrical equipment from damage caused by excessive current. The relay is commonly used in substations, switchgear, and industrial power systems.

Applications:

The Westinghouse 1875275A overcurrent relay is commonly installed in utility substations, power generation facilities, industrial plants, switchgear assemblies, and electrical distribution systems. It provides protective relaying for feeders, transformers, motors, generators, and distribution circuits by monitoring current levels and operating connected circuit breakers when fault conditions occur.

Technical Specifications:

• Manufacturer: Westinghouse Electric Corporation
• Part Number: 1875275A
• Product Type: Overcurrent Protection Relay
• Relay Type: CO-8 Electromechanical Relay
• Protection Function: Inverse-Time Overcurrent Protection
• Current Range: 0.2–2 Amps / 4–12 Amps
• Target Indicator: 3-Position Trip Indicator
• Input Type: Current Transformer (CT) Operated
• Operating Principle: Induction Disc Electromechanical Design
• 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
• Operating Environment: Industrial, Commercial, and Utility Applications
• Performance Feature: Adjustable inverse-time characteristics for coordinated system protection

Common Replacements:

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