44 Eaton Static Transfer Switch 2000A 3-Pole Installation and Operation Manual 164001127—Rev 01
88..33..11 KKiirrkk KKeeyy IInntteerrlloocckkss
Figure 17. Kirk Key Interlocks for Bypass Mode
Isolation MCCBs or MCSWs are not interlocked.
Bypass MCCBs are interlocked with Key 3:
Only one bypass should be closed at a time (to
prevent cross-connecting both sides).
Source 1 MCCB and Bypass 2 MCCB/MCSW are
interlocked with Key 1:
If Source 1 MCCB is closed,
Bypass 2 MCCB/MCSW must be open.
If Source 1 is open, Bypass must be closed.
Source 2 MCCB and Bypass 1 MCCB are interlocked
with Key 2:
If Source 2 MCCB is closed,
Bypass 1 MCCB/MCSW must be open.
If Source 2 is open, Bypass 1 is closed.
Bypass Mode is entered by physically setting up the MCCBs and MCSWs to go to bypass. The STS has key-
interlocked bypass MCCBs/MCSWs allowing logic to be disconnected from power sources without interrupting
output load power (Figure 17). Engaging the bypass and returning from bypass to STS normal mode both
require the operator to manipulate Kirk Keys and MCCBs or MCSWs.
Operational Modes
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