SMB350 User’s Manual
Page 20
measured voltage. Although the auxiliary voltage can be derived from the same
source as the measured voltage it is not recommended as the working voltage
should be as isolated from the measured voltage and be stable as possible so
that fluctuations in the measured voltage does not affect the SMB350 logic and
measurement circuits.
2.10 Using a Regular 5A Output CT
For installations with pre-existing CTs or if larger capacities is required, the
user should choose the dedicated 5A CT (either the CT-5D3 or the CT-5S) and
connect the user provided CT to the dedicated 5A CT as shown in the diagram
below.
When using regular CT, the SMB350 needs to set the CT ratio. For example,
when using 500A : 5A regular CTs, the CT ratio should set 100.
POWER
240/120/0V
Fuse
N
L
Aux. power = 240Vac
POWER
240/120/0V
N
Aux. power = 120Vac
L
Fuse
Not
used
Not
used
