1. Overview

2. Core Specifications

• Rated Current: 125 Amperes (A)
• Number of Poles: 3 Poles (3P)
• Rated Voltage: 480/277V AC (North American Standard)
• Rated Short-Circuit Breaking Capacity: 25kA (3P)
• Mounting Type: Bolt-On Mounting
• Width: 1 Inch (Compliant with DIN 5P1 Width Specification)
• Accessories: Compatible with auxiliary contacts, shunt trip coils, undervoltage release devices, buzzers and other optional accessories

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3. Product Features

4. Structure and Components

• Breaker Body: The plastic shell houses the main switching mechanism and electromagnetic components, forming the core carrier of the circuit breaker’s functions.
• Thermal-Magnetic Trip Unit: Integrates thermal-magnetic overload and short-circuit protection elements, delivering accurate and reliable dual protection for circuits.
• Operating Mechanism: Consists of a handwheel, mechanical interlocking device and visible trip indicator, ensuring stable operation and clear status feedback.
• Accessories: Includes standard optional parts such as auxiliary contacts and shunt trip coils, expanding the application and control functions of the circuit breaker.

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5. Application Fields

• Power Distribution: Low-voltage side of transformers, generator sets and power distribution cabinets
• Industrial Control: Motor starting control, frequency converter protection
• Building Facilities: HVAC systems, lighting circuits
• Specialized Industries: Commercial buildings, medical facilities, petrochemical engineering, telecommunications and other critical fields

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6. Installation and Maintenance

6.1 Installation Instructions

• Installation Location: Mounted on the DIN rail inside the power distribution cabinet, with a width of 1 inch, fully compliant with the DIN 5P1 specification for stable positioning.
• Installation Method: Fixed via the bolt-on mounting method, and it is essential to ensure a reliable grounding connection between the circuit breaker and the power distribution cabinet to avoid electrical safety hazards.

6.2 Maintenance Guidelines

• Regular Inspections: Check the trip indicator periodically to confirm no abnormal tripping occurs, and verify the normal operating status of the circuit breaker.
• Cleaning Maintenance: Keep the outer shell clean and free of dust, and prevent corrosive substances from entering the interior to avoid damage to internal components.
• Functional Testing: Conduct regular functional tests to ensure the sensitivity of the thermal-magnetic trip unit meets the specified standards and maintains reliable protection performance.
• Accessory Maintenance: For configurations equipped with auxiliary contacts, shunt trip coils or other accessories, inspect the electrical connections regularly to ensure they are firm and free of looseness or poor contact.