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External Accessories
N eutral Sensing Transformer
Hazardous Voltage.
Will cause severe injury or death.
Turn off and lock out all power before
installing this device.
Replace all covers and shields before
power supplying this device is restored.
Incorrect neutral sensor transformer could
cause nuisance tripping or improper
operation of the ground fault function.
Use only the above series of neutral sensors.
The Ampere Rating of the neutral sensor
must match the Maximum Frame rating of the
Circuit Breaker.
Safety I nstructions
A
1 .) Turn off power feeding this device before starting the
installation.
2 . ) Also turn off any line power within the immediate vicin
ity to prevent the incidental or accidental contact of
tools by the i nstaller.
Use transformers with the following breaker frame ratings
only.
N25SB
N32SB
SBS2500
SBS3200
A
DANGER
A
CAUTION
N40SB
SBS4000
Introduction
This neutral sensing transformer is designed to be mounted
on a bus bar with maximum dimensions of 5.00" x 1 .25".
Neutral Sensing Transformer
Neutral sensing transformers are used with 4-wire residual
ground fault protection and ground source schemes.
Neutral Sensing Transformer
Mounting
Position the neutral sensor as close as possible to the
associated circuit breaker and fabricate four .31 2 dia
meter holes 1 .50" x 4.00" inches apart in bus, as shown
below. Mount the neutral sensor to the bus as shown with 1 /
4-20 hardware (not provided).
Bus Mounting
67
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