QS2125H - 125Amp Circuit Breaker

QS2125H - 125Amp Circuit Breaker

The QS2125H is a 125 Amp, 2-pole thermal magnetic circuit breaker built for protecting 120/240VAC electrical systems from overloads and short circuits. With a 22kA interrupting rating, it's a solid choice for commercial, industrial, and larger residential electrical systems where higher fault current protection is required.

Inside, the thermal magnetic trip unit handles two jobs. The thermal element reacts to overloads that develop over time, while the magnetic trip responds almost instantly to short circuits. Together, they help protect connected equipment and keep electrical systems operating safely.

This breaker is also HACR rated, making it suitable for many heating, air conditioning, and refrigeration applications. It operates on 60Hz systems, is rated for 40°C ambient conditions, and accepts #3 AWG through 300 kcmil copper or aluminum conductors, giving electricians flexibility during installation and replacement projects.

Whether you're replacing a failed breaker during maintenance or matching an existing panel configuration, the QS2125H provides the electrical ratings professionals look for when dependable circuit protection matters.

Key Features and Benefits

• 125 Amp Current Rating: 125 Amp current rating.
• 2-Pole Configuration: 2-pole configuration for 120/240VAC systems.
• 22kA Interrupting Capacity: 22kA interrupting capacity at 120/240VAC.
• Thermal Magnetic Trip Unit: Thermal magnetic trip unit for overload and short-circuit protection.
• Type QSH Circuit Breaker: Type QSH circuit breaker.
• HACR Rated: HACR rated for HVAC applications.
• 60Hz Operation: Rated for 60Hz operation in 40°C ambient conditions.
• Wide Conductor Compatibility: Accepts #3 AWG–300 kcmil copper or aluminum conductors.
• Versatile Applications: Suitable for commercial, industrial, and residential electrical systems.
  

Technical Specifications

• Part Number: QS2125H
  
• Type: QSH
  
• Poles: 2
  
• Amperage: 125 Amps
  
• Voltage Rating: 120/240VAC
  
• Interrupting Capacity: 22kA @ 120/240VAC
  
• Frequency: 60Hz
  
• Trip Type: Thermal Magnetic
  
• HACR Rated: Yes
  
• Ambient Temperature: 40°C
  
• Wire Range: #3 AWG–300 kcmil Copper/Aluminum
  
• Dimensions:
  • Height: 7.88 in.
  • Width: 2.13 in.
  • Depth: 3.00 in.

Material Compliance and Certifications

• HACR Rated: The QS2125H is HACR rated and is designed for use with compatible electrical distribution equipment.
• Conductor Compatibility: It accepts both copper and aluminum conductors within the specified wire range.
• Installation Requirements: Always verify compatibility with your equipment and follow applicable electrical codes during installation.
  

Where It Works Best

• The QS2125H is commonly used in commercial buildings, industrial facilities, HVAC equipment, manufacturing plants, and larger residential electrical systems. It's well suited for protecting feeders, distribution equipment, panelboards, and other applications that require a 125 Amp, 2-pole circuit breaker with a 22kA interrupting rating.