EH34040 - 40 Amp Circuit Breaker

EH34040 - 40 Amp Circuit Breaker

The EH34040 is a dependable 40-amp, 3-pole circuit breaker engineered for three-phase power systems — ideal when safety, durability, and long-term reliability matter most. Built on the EH-4 frame, it’s a go-to choice for electrical professionals working in demanding commercial or industrial settings. With a trusted thermal-magnetic trip mechanism, this breaker reacts instantly to overloads or short circuits, safeguarding equipment and minimizing downtime. Whether you’re upgrading a service panel or replacing an older unit, the EH34040 delivers performance you can count on under heavy electrical loads.

Key Features and Benefits

• Thermal‑Magnetic Trip System: The built-in thermal‑magnetic trip feature shuts off power quickly when current exceeds safe levels — protecting your wiring and devices from damage.
• High Fault Interrupt Ratings: Designed to withstand demanding electrical conditions, the breaker is rated for 14 kA at 480 VAC and 65 kA at 240 VAC — giving you extra safety margin when faults occur.
• Versatile Compatibility: Works with a broad range of distribution systems, including panelboards and switchboards, making it useful in many commercial and industrial applications.
• Consistent Performance: Delivers stable and reliable operation even under continuous heavy loads, ensuring your system stays protected without unexpected trips.

Technical Specifications

• Poles: 3
• Amp Rating: 40 A
• Interrupt Ratings:
  • 14 kA @ 480 VAC
  • 65 kA @ 240 VAC
• Frame: EH‑4
• Dimensions:
  • Approx. 3.00" (W)
  • 3.50" (L)
  • 2.63" (D)
• Weight: ~3 lbs
• Conductor Size: Accepts aluminum or copper conductors, from #12 to #2 AWG

Material Compliance and Certifications

• UL Listed: Tested and certified for safety compliance under recognized standards.
• Temperature Rating: Rated for use in both 60 °C and 75 °C ambient environments.
• Conductor Compatibility: Designed to work safely with either aluminum or copper conductors, giving you flexibility depending on site materials.

Where It Works Best

• The EH34040 shines in commercial buildings, industrial facilities, and three-phase distribution setups that need dependable overcurrent protection. It’s especially suited for NEHB‑rated panelboards, making it a solid pick for service upgrades, new installations, or as a straightforward replacement when older breakers reach end-of-life. If you’re wiring a new distribution panel, replacing worn breakers, or simply ensuring consistent protection in a demanding electrical environment, this breaker stands out as a practical, long-lasting choice.