3.5-Phase Sensors-AK-75/1 00
For EC and Power Sensor equipped breakers:
1. Remove the existing trip devices and harnesses.
2. The MicroVersaTriprM sensors mount on the upper
breaker studs. The sensors are held on the stud with the lock
ing rings, as shown in Fig.
3-6.
Leave enough of the stud
exposed for the primary fingers to engage. Engage the sen
sor's anti-turn lugs with the notch in the locking ring. Before
tightening the locking rings, position each sensor so that its
leads will exist between the pole bases, as shown in Fig. 3-8.
3.
Mount the three sensor terminal boards to the rear
of the back frame as shown in Fig.
3-8
using the hardware
provided.
4.
Form each sensor's leads downward between the
pole bases and thru the hole in its terminal board as shown
in Fig. 3-8. Wire tie and solder to the terminals as indicated.
Be sure to position wire colors as shown.
For SST equipped breakers:
The MicroVersaTriprM sensor is physically identical to the SST
sensor. Follow the basic procedure given above and replace
the SST with the MicroVersaTriprM sensor.
Fig. 3-6. Phase sensors installed- AK-75/100
3.6-Backframe Harness Installation
Install the Backframe Harness as shown in Fig.
3-4
or Fig.
3-7.
Wire ties used to form and secure the harness are provided.
FRONT/BACK
FRAME CONNECTOR
Fig. 3-7. Back frame harness installation
AKI AKR-75/1 00
11
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