EF3B150 - 150Amp Circuit Breaker

EF3B150 - 150Amp Circuit Breaker

If you're replacing an existing EF3 frame molded case circuit breaker, the EF3B150 is designed to provide the electrical ratings and physical compatibility needed to keep your power distribution system operating as intended. Rated at 150 amps with a 3-pole configuration, this breaker helps protect three-phase electrical circuits from overloads and short circuits in commercial and industrial applications operating at up to 600VAC.

Whether you're performing scheduled maintenance, replacing a failed breaker, or servicing existing electrical equipment, selecting the correct amperage, pole configuration, and interrupting rating is essential.

Key Features and Benefits

• 150 Amp current rating for dependable overcurrent protection
• 3-pole configuration for three-phase commercial and industrial electrical systems
• Form, fit, and functional replacement for compatible EF3-frame applications
• Molded case construction built to last
• Interrupting ratings:
  • 14kA @ 600VAC
  • 14kA @ 480VAC
  • 18kA @ 240VAC
• Designed for operation in 40°C ambient environments
• Compact dimensions help simplify installation in compatible equipment
• Suitable for protecting branch circuits, feeders, motors, and other three-phase electrical equipment

Technical Specifications

• Part Number: EF3B150
  
• Type: EF3 Molded Case Circuit Breaker
  
• Poles: 3
  
• Amperage: 150 Amps
  
• Maximum Voltage: 600VAC
  
• Interrupting Rating: 14kA @ 600VAC; 14kA @ 480VAC; 18kA @ 240VAC
  
• Ambient Temperature Rating: 40°C
  
• Dimensions:
  • Width: 4.50 in.
  • Height: 6.00 in.
  • Depth: 3.63 in.
• Approximate Shipping Weight: 5.25 lbs.
  

Material Compliance and Certifications

The EF3B150 molded case circuit breaker is manufactured for installation in compatible electrical distribution equipment and is designed to meet the published electrical ratings for its frame and configuration. Before installation, verify compatibility with your panel, switchboard, or switchgear, and ensure all work is completed in accordance with applicable electrical codes and manufacturer recommendations. Any required certifications or listings should be confirmed for the specific application.

Where It Works Best

The EF3B150 is commonly used in commercial and industrial electrical systems that require a 3-pole, 150-amp molded-case circuit breaker rated for applications up to 600 VAC. It is well suited for:

• Commercial buildings
• Industrial manufacturing facilities
• Distribution panels
• Switchboards
• Control panels
• Three-phase motor protection applications
• OEM electrical equipment
• Maintenance and repair of existing electrical systems

When the electrical ratings and physical dimensions match your existing installation, the EF3B150 provides a dependable solution for maintaining circuit protection without changing the original equipment design.