Ak/Akt50 Kirkey Interlock - ABB Emax 2 Installation And Maintenance Manual

22.
23.
Figure 77
24.
25.
26.
Note that the circuit breaker is now ready for normal operation

21 - AK/AKT50 Kirkey Interlock

The Emax 2.2 Retrofill circuit breakers provided as replacements for AK/AKR circuit breakers
have a trip interlock feature which will function using the AKT-50 compartment mounted
Key Interlock. A label is provided with full instructions on how to operate the Legacy Key
Interlock. It is suggested to apply label on inside of the compartment door (figure
67). Following is a brief summary of how the Key Interlock system is operated.
To activate the key interlock:
1.
2. Rotate the screw on the lower front panel of the cassette which normally allows
3. While the screw is held rotated Clockwise, the Key Interlock slide in the switchgear
4. Turn the key to the key removal position, extending the bolt and lock the breaker in
For detail instructions for AKD-5 , 600A & 1600A for CiC solution refer Kir Key installation
& operation manual 2TSA451013P0000
38| © 2020 Emax 2 Retrofill Circuit Breakers 600A-4000A
As the breaker approaches the TEST position, check the alignment of the fixed and
moving parts of the secondary disconnect contacts. (If a motor-spring charge or
under-voltage release is installed, the device may operate when approaching the TEST
position)
Continue rotating the racking handle clockwise until the position indicator first shows
TEST, then CONNECTED.
NOTE 1: When approaching the CONNECTED position, effort to turn the racking
handle increases as the primary finger clusters engage with the AKD-5 bus
stabs.
Indicator Position Location
(DISCONNECTED, TEST & CONNECTED)
Keep cranking until reaching a positive stop. Full travel is about 37 turns and about 3
turns after the indicator first shows Connected. At this point, the fingers at the back
of the circuit breaker should be properly engaged on the bus stabs of the AKD-5
switchgear.
Using a light and mirror try to make an observation of the primary disconnect fingers
to be sure they are making good contact on the flat portions of the switchgear bus
stabs.
Remove and store the racking handle in its storage location.
OPEN the breaker.
access to the racking screw. This will hold the breaker trip free.
is pushed inward, elevating a pin on the left side of the breaker.
the OPEN position.
Cassette Position Indicator
2TSA451011P0000 Rev-B