KRB-5368c
-38-
6-2-4. Instantaneously-rated shunt trip device (SHT)
The following describes how to replace the Instantaneously-rated shunt trip device(SHT).
1) Make preparations for parts replacement. Refer to section 6-2-1.
2) Turn the cover mounting screws five or six turns to loosen as shown in Fig. 23. If the ACB is equipped with side covers, first
remove the side covers and then loosen the front cover mounting screws. (The cover mounting screws are of captive type and
cannot be removed from the side and front covers.)
3) Pulling the charging handle down, remove the front cover.
4) Remove the terminal block fixing screws as shown in Fig. 24, and move the terminal block.
5) Turn the SHT mounting screws eight or ten turns to loosen, disconnect the manual connector (black), and then remove the SHT.
See Fig. 33.
Fig. 33 Removing the SHT
6) Reinstall each part or component in reverse order of removal after inspection. When installing the SHT, make sure the nameplate
on the SHT can be viewed from the front of the ACB.
Fig. 34 provides the general view of the SHT.
Fig. 34 General view of SHT
Hand connector (black)
Contact block
SHT mounting screw,
Pan head M4 x 80 (2)
with spring washer
Tightening torque: 1.3 - 1.7 N·m
SHT
LRC
Plunger
SHT mounting screw
Moving core
(located in the center hole)
Hand connector (black)
Coil resistance measuring point
Plunger length measurement
Summary of Contents for TemPower2 AR-E Series
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