LH36300 - 300 Amp Circuit Breaker

LH36300 - 300 Amp Circuit Breaker

The breaker may say 300A on the handle, but that's only one part of identifying the right match. The LH36300 is a 300A, 3-pole molded case circuit breaker with a thermal-magnetic trip unit and an I-Line mounting configuration. Manufacturer information specifies a 25 kA interrupting rating at 600VAC and 50 kA at 250VDC. Each pole contains thermal sensing for overload conditions and magnetic sensing for short-circuit conditions. The magnetic characteristics are listed at 1,500A hold current and 3,000A tripping current. On the connection side, the LH36300 uses I-Line on the line side and AL400LA lugs on the load side. Those details matter when you're matching a breaker in existing equipment, especially when the goal is to maintain the original form, fit, and function.

Key Features and Benefits

• 300A, 3-pole molded case circuit breaker for compatible I-Line electrical distribution equipment
• Thermal-magnetic protection responds to overload and short-circuit conditions
• Manufacturer-specified 1,500A magnetic hold current
• Manufacturer-specified 3,000A magnetic tripping current
• I-Line line-side connection for the specified equipment configuration
• AL400LA lugs on the load side
• Push-to-Trip allows manual tripping without exposure to live parts
• HACR rated for applicable heating, air-conditioning, and refrigeration applications
• Useful for maintenance and replacement work where the existing equipment requires the specific electrical and mechanical characteristics of the LH36300

Technical Specifications

• Catalog Number: LH36300
  
• Product Type: Molded Case Circuit Breaker
  
• Frame / Series: LH
  
• Rated Current: 300A
  
• Number of Poles: 3
  
• Trip Unit Technology: Thermal-Magnetic
  
• Breaking Capacity Code: H
  
• Interrupting Rating at 600VAC: 25 kA
  
• Interrupting Rating at 250VDC: 50 kA
  
• Magnetic Hold Current: 1,500A
  
• Magnetic Tripping Current: 3,000A
  
• Mounting Mode: I-Line
  
• Line-Side Connection: I-Line
  
• Load-Side Connection: Lugs
  
• Terminal Identifier: AL400LA
  
• Height: 12.5 in. (317.5 mm)
  
• Width: 6 in. (152.4 mm)
  
• Depth: 4 in. (101.6 mm)
  
• Circuit Breaker Application: HACR Rated
  
• Country of Origin: Mexico
  
• GTIN: 785901339410
  

Material Compliance and Certifications

Manufacturer specifications identify the LH36300 as UL Listed and CSA certified. The supplied product information also states that LH molded case circuit breakers carry UL 489, CSA, and IEC certification.

Where It Works Best

The LH36300 300A 3-pole circuit breaker belongs in the conversation when you're servicing existing or legacy I-Line electrical distribution equipment that calls for this particular breaker configuration.

For a replacement check, amperage and pole count are easy: 300A and three poles. Next, confirm that the application calls for a thermal-magnetic LH breaker. Available fault current and system voltage must also fall within the appropriate ratings. Manufacturer information specifies 25 kA at 600VAC and 50 kA at 250VDC for this breaker.