Westinghouse 1373D96G21 Magnetic Interchangeable Trip Unit

Description:

The Westinghouse 1373D96G21 is a magnetic-only interchangeable trip unit designed for use with Westinghouse LA and HLA frame molded case circuit breakers. This trip unit provides instantaneous magnetic protection against short-circuit and high fault-current conditions without thermal overload protection. It is commonly used in industrial power distribution systems, motor circuits, feeder applications, and specialized protection systems where separate overload protection is provided. The trip unit features an adjustable magnetic trip range of 1500 to 3000 Amps and is intended for LA/HLA breaker applications.

Applications:

The Westinghouse 1373D96G21 magnetic-only trip unit is commonly used in motor protection systems, feeder circuits, switchgear, industrial machinery, and power distribution equipment requiring instantaneous short-circuit protection. It is installed in manufacturing facilities, processing plants, utility systems, and commercial electrical installations utilizing LA and HLA frame circuit breakers. Magnetic-only trip units are often applied where overload protection is supplied separately through motor overload relays or coordinated protection schemes.

Technical Specifications:

• Manufacturer: Westinghouse Electric Corporation
• Part Number: 1373D96G21
• Product Type: Magnetic-Only Trip Unit
• Series Compatibility: LA / HLA Frame Circuit Breakers
• Protection Type: Instantaneous Magnetic Trip Only
• Trip Adjustment Range: 1500–3000 Amps
• Function: Short-circuit and fault-current protection
• Trip Technology: Magnetic-Only
• Application: Industrial and commercial power distribution systems
• System Compatibility: Westinghouse LA and HLA molded case circuit breakers
• Mounting Type: Interchangeable Trip Unit
• Installation Type: Internal breaker-mounted assembly
• Voltage Rating Compatibility: Up to 600 VAC
• Operating Environment: Industrial and commercial electrical applications
• Intended Use: Feeder, motor, and equipment fault protection
• Performance Feature: Adjustable magnetic-only protection for rapid fault-current interruption and coordinated system protection.

Common Replacements:

• Eaton LA/HLA Magnetic-Only Trip Unit
• Cutler-Hammer LA Frame Adjustable Magnetic Trip Unit
• Eaton Series C Magnetic Trip Unit for High-Current Applications