Westinghouse Electric DB75 Air Circuit Breaker

Description:

The Westinghouse DB75 3000 Amp Air Circuit Breaker Amptector I-A Model LIG Trip is an industrial low-voltage air circuit breaker used in high-capacity power distribution and switchgear systems for overload, short-circuit, and fault current protection. Commonly installed in industrial substations, switchgear lineups, motor control centers, and large-scale manufacturing facilities requiring dependable high-amperage circuit interruption and adjustable solid-state trip protection. Maintenance technicians, electrical engineers, and system integrators use this air circuit breaker for switchgear maintenance, industrial retrofit projects, and electrical infrastructure upgrades. The Amptector I-A trip system provides adjustable LIG protection functions including Long-Time, Instantaneous, and Ground Fault protection.

Applications:

The Westinghouse DB75 air circuit breaker is designed for industrial power protection in demanding electrical environments. It is frequently used in manufacturing facilities, utility substations, process automation plants, motor control systems, and industrial distribution networks where dependable high-current interruption and adjustable overcurrent protection are critical for electrical reliability, equipment safety, and operational continuity. DB-75 breakers are commonly configured as electrically operated drawout air breakers in switchgear assemblies.

Technical Specifications:

• Brand: Westinghouse
• Part Number: DB75
• Product Type: Air Circuit Breaker
• Current Rating: 3000 Amp
• Voltage Rating: 600V AC
• Trip Unit: Amptector I-A
• Protection Functions: LIG (Long-Time, Instantaneous, Ground Fault)
• Breaker Type: Low-voltage air circuit breaker
• Function: Overload and fault current protection
• Application: Industrial power distribution systems
• Suitable For: Switchgear and motor control protection
• Mounting Type: Drawout or stationary switchgear installation
• Usage Environment: Industrial electrical systems
• Compatibility: Westinghouse DB series switchgear
• Construction: Industrial-duty breaker housing
• Designed For: Continuous industrial operation
• Purpose: High-current circuit interruption and protection

Common Replacements:

• Eaton Magnum DS Air Circuit Breaker
• Siemens WL Air Circuit Breaker
• Square D Masterpact Air Circuit Breaker