HKB3125T - 125Amp Trip Unit

HKB3125T - 125Amp Trip Unit

The HKB3125T thermal-magnetic trip unit is a 125-amp component designed for use with compatible KB and HKB frame circuit breakers. It is commonly used in maintenance and replacement projects where keeping your existing electrical equipment in service is important. Rather than replacing an entire breaker assembly, this trip unit helps maintain the original system configuration by matching the required frame type and trip function.

With a thermal magnetic design and an adjustable magnetic hi-low trip setting range of 625-1250 A, this trip unit supports established circuit breaker assemblies that require a compatible replacement component. When installed correctly in the proper frame, the HKB3125T is built for long-term use in properly maintained electrical distribution equipment.

Key Features and Benefits

• 125 Amp Rating: Designed for systems requiring a 125-amp thermal magnetic trip unit.
• KB and HKB Frame Compatibility: Intended for use with compatible KB and HKB frame circuit breaker assemblies.
• 3-Pole Design: Supports compatible three-phase electrical applications.
• Thermal Magnetic Operation: Provides thermal and magnetic trip functions for applicable circuit protection requirements.
• Adjustable Magnetic Trip Range: Features a magnetic hi-low trip setting range of 625-1250 A.
• Replacement-Focused Design: Helps maintain existing breaker assemblies without changing the original system layout.

Technical Specifications

• Part Number: HKB3125T
  
• Type: HKB
  
• Component Type: Thermal Magnetic Trip Unit
  
• Compatible Frames: KB and HKB Frames
  
• Amperes: 125 A
  
• Poles: 3
  
• Approximate Shipping Weight: 3.00 lbs.
  
• Dimensions: 3.00"W x 3.75"L x 3.31"D
  
• Height: 3.75 in.
  
• Width: 3.0 in.
  
• Depth: 3.31 in.
  
• Trip Function: Thermal Magnetic Only
  
• Magnetic Hi-Low Trip Setting Range: 625-1250 A
  

Material Compliance and Certifications

The HKB3125T thermal magnetic trip unit should be installed in accordance with the requirements of the compatible circuit breaker assembly and all applicable electrical codes and standards. Frame compatibility and trip settings should be verified before installation to ensure proper fit and function. Compliance details should be confirmed through product markings and available manufacturer documentation.

Where It Works Best

The HKB3125T is well suited for commercial buildings, industrial facilities, and electrical maintenance environments where compatible KB or HKB frame circuit breakers are already installed. It works best in applications where maintaining an existing breaker assembly is important and a properly matched trip unit is needed.