NM632300 - 300Amp Circuit Breaker

NM632300 - 300Amp Circuit Breaker

The NM632300 is a 300 amp, 3-pole molded case circuit breaker used in commercial and industrial electrical systems. It’s typically installed in three-phase panels where dependable overcurrent protection is required. This breaker uses a thermal-magnetic trip, allowing it to handle normal operating loads while reacting quickly to overloads and short circuits. The breaker mounts using a bolt-on style, which helps keep it firmly seated in the panel. Load-side lug terminals are included, so there’s no need to source them separately. This model is commonly used for maintenance and replacement work where an existing breaker needs to be swapped without changing the panel layout.

Key Features and Benefits

• 300 amp current rating
• 3-pole configuration for three-phase systems
• Thermal-magnetic trip protection
• Molded case construction
• Bolt-on mounting
• Load-side lugs included

Technical Specifications

• Part Number: NM632300
• Poles: 3
• Amperage: 300A
• Interrupting Capacity:
  • 22k @ 600VAC
  • 30k @ 480VAC
  • 42k @ 240VAC
• Frame Type: NM
• Temperature Rating: 40°C
• Dimensions: 8.19" W × 15.50" L × 4.13" D
• Approximate Weight: 38 lbs
• Mounting Type: Bolt-On

Material Compliance and Certifications

This circuit breaker is built to meet standard electrical industry requirements for performance and safety. Materials are selected to handle heat and electrical stress under rated conditions. When installed correctly, it supports safe operation in approved electrical systems.

Where It Works Best

The NM632300 is best suited for commercial and industrial panels where a 300 amp, three-pole breaker is required. It’s commonly used in maintenance situations, upgrades, or direct replacements in existing electrical equipment.