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EF3A050

Siemens
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Siemens EF3A050 is a 3-pole molded case circuit breaker from the EF Series, designed for instantaneous magnetic-only protection in industrial power distribution systems. It is rated for 50A at 600V with a 14kA interrupting capacity at 480V, and it accepts wire sizes from 14 to 10 AWG for both aluminum and copper conductors. The unit features a bolt-on connection, weighs 8 lb, and is constructed for three-phase applications. It is UL certified, ensuring compliance with industry safety standards. This breaker is typically used in commercial and industrial settings requiring reliable short-circuit protection without thermal overload elements.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker
  • Manufacturer: Siemens
  • Series/Frame: EF
  • Amperage: 50A
  • Voltage Rating: 600V
  • Poles: 3
  • Phase: 3
  • Mounting Type: Bolt-On
  • Interrupt Rating: 14kA @ 480V
  • Protection: Magnetic Only
  • Functions: I - Instantaneous
  • Wire Size: 12 to 10 AWG, 14 to 10 AWG, Aluminum/Copper
  • Weight: 8 lb
  • Certification: UL


Siemens EF3A050 - Molded Case Circuit Breaker 50A 600V