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Bypass Switch Variations John J. Stark Marketing Services Coordinator, Russelectric Inc.

Bypass Switch Variations John J. Stark Marketing Services Coordinator, Russelectric Inc. Lets Talk Conceptually About Load Break & No Load Break Bypass Switches. Lets Begin with Load Break Bypass Switches…. Load Break design (Break-Before-Make Bypass). ATS. ATS. ATS. ATS. ATS. ATS. ATS.

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Bypass Switch Variations John J. Stark Marketing Services Coordinator, Russelectric Inc.

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  1. Bypass Switch Variations John J. StarkMarketing Services Coordinator, Russelectric Inc.

  2. Lets Talk Conceptually About Load Break & No Load BreakBypass Switches

  3. Lets Begin with Load Break Bypass Switches… Load Break design (Break-Before-Make Bypass) ATS ATS ATS ATS ATS ATS ATS ATS NORM NORM NORM NORM NORM ISOLATE ISOLATE ISOLATE ISOLATE ISOLATE NORM NORM NORM ISOLATE ISOLATE ISOLATE Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO BPN BPN BPN BPN BPN BPE BPE BPE BPE BPE BPN BPN BPN BPE BPE BPE Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle BPN BPN BPN BPN BPN BPE BPE BPE BPE BPE BPN BPN BPN BPE BPE BPE Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Emergency Power Available Emergency Power Available Emergency Power Available Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected LOAD LOAD LOAD LOAD LOAD LOAD LOAD LOAD Normal Power Available Normal Power Available Normal Power Available LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL Load Break Contacts Emergency Power Available Switch Bypassed to Emergency LOAD BYPASSED TO NORMAL

  4. ATS portion may be racked in regardless of position and regardless of power availability Load Break design (Break-Before-Make Bypass) Notice ATS Portion still in Normal Position ATS ATS ATS ATS ATS ATS ATS ATS ATS ATS ATS ATS ATS ATS ATS ATS NORM ISOLATE NORM NORM NORM NORM NORM NORM NORM NORM NORM ISOLATE ISOLATE ISOLATE ISOLATE ISOLATE ISOLATE ISOLATE ISOLATE ISOLATE NORM NORM NORM NORM ISOLATE ISOLATE ISOLATE ISOLATE NORM NORM ISOLATE ISOLATE Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO BPN BPE BPN BPN BPN BPN BPN BPN BPN BPN BPN BPE BPE BPE BPE BPE BPE BPE BPE BPE BPN BPN BPN BPN BPE BPE BPE BPE BPN BPN BPE BPE Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle BPN BPE BPN BPN BPN BPN BPN BPN BPN BPN BPN BPE BPE BPE BPE BPE BPE BPE BPE BPE BPN BPN BPN BPN BPE BPE BPE BPE BPN BPN BPE BPE Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Emergency Power Available Emergency Power Available Emergency Power Available Emergency Power Available Emergency Power Available Emergency Power Available Emergency Power Available Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected LOAD LOAD LOAD LOAD LOAD LOAD LOAD LOAD LOAD LOAD LOAD LOAD LOAD LOAD LOAD LOAD Normal Power Available Normal Power Available Normal Power Available Normal Power Available Normal Power Available Normal Power Available Switch Bypassed to Emergency LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL Notice ATS Portion still in Normal Position Load Break Contacts Emergency Power Available Switch Bypassed to Emergency LOAD BYPASSED TO NORMAL

  5. Load Break design (Break-Before-Make Bypass) ATS ATS ATS ATS ATS ATS ATS ATS ATS ATS ATS ATS ATS ATS ATS ATS NORM ISOLATE NORM NORM NORM NORM NORM NORM NORM NORM NORM ISOLATE ISOLATE ISOLATE ISOLATE ISOLATE ISOLATE ISOLATE ISOLATE ISOLATE NORM NORM NORM NORM ISOLATE ISOLATE ISOLATE ISOLATE NORM NORM ISOLATE ISOLATE Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO AUTO BPN BPE BPN BPN BPN BPN BPN BPN BPN BPN BPN BPE BPE BPE BPE BPE BPE BPE BPE BPE BPN BPN BPN BPN BPE BPE BPE BPE BPN BPN BPE BPE Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle BPN BPE BPN BPN BPN BPN BPN BPN BPN BPN BPN BPE BPE BPE BPE BPE BPE BPE BPE BPE BPN BPN BPN BPN BPE BPE BPE BPE BPN BPN BPE BPE Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Emergency Power Available Emergency Power Available Emergency Power Available Emergency Power Available Emergency Power Available Emergency Power Available Emergency Power Available Emergency Power Available Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected LOAD LOAD LOAD LOAD LOAD LOAD LOAD LOAD LOAD LOAD LOAD LOAD LOAD LOAD LOAD LOAD Normal Power Available Normal Power Available Normal Power Available Normal Power Available Normal Power Available Normal Power Available Switch Bypassed to Emergency Switch Bypassed to Emergency LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL What if we were to remove the load break contacts to be like all of our competition’s designs? Notice ATS Portion still in Normal Position X

  6. 1. Normal power is lost. Most Common Scenario for an Emergency Bypass and biggest Benefit to Load Break Bypass…

  7. 1. Normal power is lost. Most Common Scenario for an Emergency Bypass and biggest Benefit to Load Break Bypass… ATS NORM ISOLATE AUTO BPN BPE BPN BPE LOAD EMERGENCY NORMAL

  8. 1. Normal power is lost. Most Common Scenario for an Emergency Bypass and biggest Benefit to Load Break Bypass… ATS NORM ISOLATE AUTO BPN BPE BPN BPE LOAD 2. Auto Engine Start Signal Initiates EMERGENCY NORMAL

  9. 1. Normal power is lost Most Common Scenario for an Emergency Bypass and biggest Benefit to Load Break Bypass… ATS ATS ATS NORM NORM NORM ISOLATE ISOLATE ISOLATE AUTO AUTO AUTO BPN BPN BPN BPE BPE BPE BPN BPN BPN BPE BPE BPE LOAD LOAD LOAD 2. Auto Engine Start Signal Initiates 3. Emergency Power Available EMERGENCY EMERGENCY EMERGENCY NORMAL NORMAL NORMAL X 4. ATS Fails to Transfer In this situation, what is going on with the load circuit? To digress, with a no-load break bypass switch, how can we get emergency power to the load which desperately needs it?

  10. 1. Normal power is lost Most Common Scenario for an Emergency Bypass and biggest Benefit to Load Break Bypass… X ATS ATS ATS ATS ATS X NORM NORM NORM ISOLATE ISOLATE ISOLATE NORM NORM ISOLATE ISOLATE AUTO AUTO AUTO AUTO AUTO BPN BPN BPN BPE BPE BPE BPN BPN BPE BPE BPN BPN BPN BPE BPE BPE BPN BPN BPE BPE LOAD LOAD LOAD LOAD LOAD 2. Auto Engine Start Signal Initiates 3. Emergency Power Available EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY NORMAL NORMAL NORMAL NORMAL NORMAL X 4. ATS Fails to Transfer In this situation, what is going on with the load circuit? With a load break bypass switch, it’s one simple throw of the handle.

  11. Now Let’s Discuss No-Load Break Bypass Switches…

  12. No Load Break design (Make-Before-Break Bypass) Load Contacts Overlap Bypass Handle Bypass Handle Bypass Handle Load Momentarily Disconnected Load Momentarily Disconnected LOAD BYPASSED TO NORMAL ATS ATS NORM NORM ISOLATE NORM NORM ISOLATE ISOLATE Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts AUTO AUTO AUTO BPN BPE BPN BPN BPE BPE Load Momentarily Disconnected BPN BPE BPN BPE BPN BPN BPE BPE Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Emergency Power Available LOAD LOAD LOAD LOAD Switch Bypassed to Emergency LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL EMERGENCY EMERGENCY EMERGENCY EMERGENCY NORMAL NORMAL NORMAL NORMAL

  13. No Load Break design (Make-Before-Break Bypass) Scenario #1, Bypass to Normal (for Maintenance Purposes) Load Contacts Overlap Bypass Handle Bypass Handle Bypass Handle Load Momentarily Disconnected Load Momentarily Disconnected LOAD BYPASSED TO NORMAL Contacts are electrically interlocked to prevent bypassing to the alternate source, thus connecting normal and emergency sources together. ATS ATS NORM NORM ISOLATE NORM NORM Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts AUTO AUTO BPN BPE Load Momentarily Disconnected BPN BPE BPN BPN BPE Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Emergency Power Available LOAD LOAD LOAD Switch Bypassed to Emergency LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL EMERGENCY EMERGENCY EMERGENCY NORMAL

  14. Scenario #1, Bypass to Normal (for Maintenance Purposes) X Bypass Handle Bypass Handle Bypass Handle Load Momentarily Disconnected Load Momentarily Disconnected LOAD BYPASSED TO NORMAL ATS ATS NORM NORM ISOLATE NORM NORM Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts AUTO AUTO BPN BPE Load Momentarily Disconnected BPN BPE BPN BPN BPE Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Emergency Power Available LOAD LOAD LOAD Switch Bypassed to Emergency LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL EMERGENCY EMERGENCY EMERGENCY NORMAL

  15. Scenario #1, Bypass to Normal (for Maintenance Purposes) Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL ATS ATS ATS ATS NORM NORM NORM ISOLATE NORM NORM NORM ISOLATE NORM NORM Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts AUTO AUTO AUTO AUTO BPN BPE BPN BPE Load Momentarily Disconnected Load Momentarily Disconnected BPN BPE BPN BPN BPE BPN BPE BPN BPN BPE Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Emergency Power Available Emergency Power Available LOAD LOAD LOAD LOAD LOAD LOAD Switch Bypassed to Emergency Switch Bypassed to Emergency LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY NORMAL NORMAL

  16. Scenario #1, Bypass to Normal (for Maintenance Purposes) ATS ATS ATS ATS NORM NORM NORM NORM ISOLATE ISOLATE NORM NORM NORM NORM Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts AUTO AUTO AUTO AUTO BPN BPN BPE BPE Load Momentarily Disconnected Load Momentarily Disconnected Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle BPN BPN BPE BPE BPN BPN BPN BPN BPE BPE Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Emergency Power Available Emergency Power Available Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected Load Momentarily Disconnected LOAD LOAD LOAD LOAD LOAD LOAD Switch Bypassed to Emergency Switch Bypassed to Emergency LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY EMERGENCY NORMAL NORMAL ATS ATS NORM NORM ISOLATE NORM NORM Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts Load Break Contacts AUTO AUTO BPN BPE Load Momentarily Disconnected BPN BPE BPN BPN BPE Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Bypass Handle Emergency Power Available LOAD LOAD LOAD Switch Bypassed to Emergency LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL LOAD BYPASSED TO NORMAL EMERGENCY EMERGENCY EMERGENCY NORMAL

  17. Benefits of the Load Break Bypass Design • Power can be maintained to load during ATS failure • Provides a means of bypassing the ATS for maintenance • No elaborate system of electrical solenoids, electrical interlocks or mechanical interlocks • Fast, Simple and Easy Operation • Power can be maintained to load during ATS failure • Provides a means of bypassing the ATS for maintenance • No elaborate system of electrical solenoids, electrical interlocks or • mechanical interlocks • Fast, Simple and Easy Operation

  18. Benefits of the No Load Break Bypass Design • Power can be maintained to load during ATS failure • Provides a means of bypassing the ATS for maintenance without load interruption • Power can be maintained to load during ATS failure • Provides a means of bypassing the ATS for maintenance without load interruption

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