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Siemens EH3B040 - Molded Case Circuit Breaker 40A 3-Pole 480V

Siemens
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Siemens EH3B040 is a molded case circuit breaker from the EH Series, designed for overcurrent protection in industrial and commercial power distribution systems. This three-pole, 40A breaker operates at 480V AC with a thermal magnetic trip unit providing LI (Long-Time and Instantaneous) protection functions, and it delivers an interrupting rating of 14kA at 480V AC. The unit features bolt-on mounting, weighs 8 lb, and supports lug terminal connections for wire sizes from 12 to 10 AWG aluminum and 14 to 10 AWG copper. It is UL listed, ensuring compliance with industry safety standards for reliable circuit protection. Typical applications include branch circuit protection in panelboards, switchboards, and motor control centers, particularly in retrofit installations for older ITE equipment.

Key Features & Specifications
  • Type: Molded Case
  • Family: EH Series
  • Functions: LI - Long-Time and Instantaneous
  • Voltage Rating: 480V
  • Poles: 3
  • Connection: Bolt-On
  • Protection: Thermal Magnetic
  • AIC rating: 14kA@480V
  • Phase: 3
  • Current Rating: 40A
  • Weight: 8 lb
  • Interrupt Rating: 18 kA at 240 VAC, 14 kA at 480 VAC
  • Terminal Type: Lug
  • Wire Size: 12-10 AWG Aluminum, 14-10 AWG Copper
  • Certifications: UL Listed