E43B100 - 100Amp Circuit Breaker

E43B100 - 100 Amp Circuit Breaker

When maintaining or servicing an existing electrical distribution system, having the right replacement breaker matters. The E43B100 molded case circuit breaker provides the correct form, fit, and function for equipment designed to use the E43 frame. Rated at 100 amps with a 3-pole configuration, it is commonly used in three-phase power systems found in commercial and industrial facilities. This breaker is designed to handle interrupting capacities of 18kA at 480VAC and 25kA at 240VAC, helping protect wiring and connected equipment from overloads and short circuits. The bolt-on mounting design allows the breaker to fasten securely into compatible panelboards, while the included load-side terminals simplify the connection of conductors during installation. It is also HACR rated, making it suitable for circuits serving heating, air conditioning, and refrigeration equipment. Built for operation in 40°C ambient environments, the E43B100 continues to be a practical solution for facilities maintaining established electrical systems. Molded case circuit breakers like this one are built to last and remain widely used in many power distribution setups.

Key Features and Benefits

• 100 Amp Rating – Designed for circuits requiring dependable overcurrent protection at the 100A level.
• 3-Pole Breaker Design – Supports three-phase electrical systems commonly found in commercial and industrial buildings.
• Bolt-On Mounting – Secures directly to compatible panelboards designed for bolt-on circuit breakers.
• E43 Frame Compatibility – Provides the correct footprint and connection style for equipment built around the E43 frame.
• HACR Rated – Suitable for circuits serving heating, air conditioning, and refrigeration equipment.
• Load-Side Terminals Included – Helps streamline installation and conductor connections.
• 40°C Ambient Rating – Designed for operation in standard electrical room environments.

Technical Specifications

• Part Number: E43B100
• Breaker Type: Molded Case Circuit Breaker
• Frame Type: E43
• Amperage Rating: 100 Amps
• Number of Poles: 3
• Interrupting Capacity:
  • 18kA @ 480VAC
  • 25kA @ 240VAC
• Mounting Type: Bolt-On
• HACR Rated: Yes
• Temperature Rating: 40°C
• Included Components: Load-side terminals
• Approximate Height: 6.35 in
• Approximate Shipping Weight: 3.0 lbs

Material Compliance and Certifications

• The E43B100 molded case circuit breaker is produced to meet widely recognized electrical industry standards for molded case circuit breakers used in North American power distribution systems. Its HACR rating indicates it can be used on heating, air conditioning, and refrigeration circuits when installed according to applicable electrical codes and equipment specifications.

Where It Works Best

• The E43B100 100A 3-pole breaker is commonly installed in commercial buildings, manufacturing facilities, institutional properties, and other environments with three-phase electrical service. It works well in panelboards, switchboards, and electrical distribution systems designed for the E43 frame, especially when maintaining or servicing existing infrastructure. Typical uses include HVAC equipment circuits, motor loads, and general power distribution, where matching the correct breaker footprint and electrical ratings is essential.