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ASCO 4000 SERIES Bypass Isolation Transfer Switch

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The ASCO 4000 SERIES Bypass Isolation Transfer Switch provides the necessary capabilities and features required to reliably transfer critical loads between differing power sources. It can shunt its primary transfer mechanism at the touch of a button using a new electrical operator.



  • One-line diagram for intuitive status indication
  • LEDs indicate permitted and restricted operations
  • Allows bypass-isolation without load interruption
  • Bypass switch and transfer switch have identical electrical ratings
  • Bypass contacts carry current only during bypass mode


  • Intelligent self-diagnostics streamline troubleshooting
  • Single-touch bypass controls
  • Automated logging facilitates evaluation and review of historical events
  • Adjustable delay and trip settings enable site-specific transfer sequences


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