EH3B040 - 40Amp Circuit Breaker

EH3B040 - 40 Amp Circuit Breaker

If you're working on an existing panel and need a breaker that fits right the first time, the EH3B040 molded case circuit breaker is exactly the kind of component you’re looking for. It’s a 40-amp, 3-pole breaker built for EH3 frame systems—so instead of second-guessing compatibility, you can focus on getting the job done. This unit is commonly used in commercial and light industrial setups where consistent circuit protection matters. With an interrupting capacity of 14kA at 480VAC and 18kA at 240VAC, it’s designed to handle fault conditions without unnecessary complications. The molded case design has been around for a reason—it holds up, performs consistently, and does what it’s supposed to do over time. Whether you're replacing a worn breaker or keeping spare inventory on hand for maintenance, this is a practical, no-surprises solution. Install it, and it works—simple as that.

Key Features and Benefits

• 40 amp rating for reliable circuit protection in everyday applications
• 3-pole configuration ideal for multi-phase systems
• Designed to match EH3 frame panels for proper fit and alignment
• Interrupting capacity: 14kA @ 480VAC, 18kA @ 240VAC
• Molded case construction built to last under normal use
• Rated for 40°C environments typical in electrical installations
• A dependable choice for maintenance teams and contractors

Technical Specifications

• Part Number: EH3B040
• Amperage: 40A
• Poles: 3
• Frame Type: EH3
• Interrupting Rating:
  • 14kA @ 480VAC
  • 18kA @ 240VAC
• Operating Temperature: 40°C
• Breaker Type: Molded Case Circuit Breaker
• Weight: 4.5 lbs
• Height: 6.0 inches

Material Compliance and Certifications

• Manufactured to meet standard industry requirements for molded case circuit breakers
• Suitable for installations following NEC (National Electrical Code) guidelines
• Designed for use in systems requiring consistent and code-aligned protection

Where It Works Best

• Commercial buildings using EH3 frame breaker panels
• Light industrial facilities with steady electrical loads
• Maintenance and repair jobs where correct fit is critical
• Replacement of existing 40A, 3-pole EH3 breakers
• Electrical rooms operating in ambient temperatures up to 40°C