HK3B120 - 1200Amp Circuit Breaker

HK3B120 - 1200Amp Circuit Breaker

The HK3B120 molded-case circuit breaker is a 3-pole, 1200-amp electrical protection device designed for use in compatible HK3-frame applications. It is commonly used in commercial and industrial power distribution systems where maintaining your existing electrical configuration and matching established equipment specifications are important.

Key Features and Benefits

• 1200 Amp Rating: Designed for electrical systems requiring a 1200-amp molded case circuit breaker.
• 3-Pole Configuration: Supports compatible three-phase electrical applications requiring coordinated circuit protection.
• HK3 Frame Compatibility: Intended for systems that specify HK3 frame circuit breakers for replacement and maintenance applications.
• Type ET Design: Configured as a Type ET 1200-ampere HK-frame molded-case circuit breaker.
• 40°C Application Rating: Designed for use in applications with a 40°C operating environment.
• Replacement-Focused Application: Helps maintain existing electrical systems where matching specifications and equipment compatibility are required.

Technical Specifications

• Part Number: HK3B120
  
• Type: HK3
  
• Style: Molded Case Circuit Breaker (MCCB)
  
• Frame Type: HK Frame
  
• Amperes: 1200 A
  
• Poles: 3
  
• Approximate Shipping Weight: 55.00 lbs.
  
• Dimensions: 9.00"W x 15.50"L x 4.00"D
  
• Height: 15.50 in.
  
• Width: 9.0 in.
  
• Depth: 4.0 in.
  
• A.I.C. Ratings:
  • 42kA @ 600VAC
  • 50kA @ 480VAC
  • 65kA @ 240VAC
• Temperature Rating: 40°C
  
• Frame Rating: 1200 Ampere HK Frame
  
• Trip Unit Type: ET
  

Material Compliance and Certifications

The HK3B120 circuit breaker should be installed in accordance with the requirements of the electrical equipment it is used with, as well as all applicable electrical codes and standards. Voltage ratings, interrupt ratings, and system compatibility should be verified before installation. Certification and compliance details should be confirmed through product markings and available manufacturer documentation.

Where It Works Best

The HK3B120 is well suited for industrial facilities, commercial buildings, and electrical maintenance applications where HK3 frame-compatible equipment is already installed. It works best in situations where replacing an existing molded case circuit breaker while maintaining the original power distribution design is important. Electricians, contractors, and facility maintenance teams can use this type of breaker to support ongoing service needs in established switchgear and electrical distribution systems where proper fit, compatibility, and application requirements must be maintained.