Wathever the Masterpact
feeding type, by open or
bottom side, the power
connection and the
terminal connection of
external CT are
compulsary the same of
those phases CT ones.
DB117308
DB117297
It is used with 3P circuit breakers and is installed on the
neutral conductor to achieve a GFP protection of
residual type.
For Masterpact NT and NW08/40
DB117330
External transformer (CT) for
residual GF Protection
Masterpact NW40b/63
DB117309
DB117307
Cabling precautions:
b shielded cable with 2 twisted pairs
b shielding connected to GND on one end only
b maximum length 5 meters
b cable cross-sectional area to 0.4 to 1.5 mm2.
b recommended cable: Belden 9552 or equivalent
b the external CT rating may be compatible with the
circuit breaker normal rating:
NT06 to NT16: CT 400/1600
NW08 to NW20: CT 400/2000
NW25 to NW40: CT 1000/4000
NW40b to NW63: CT 2000/6300.
The signal connection Vn is necessary only for power
measurement (Micrologic P/H).
Feeding by open side H2 is connected to source
side and H1 to receiver side..
Alimentation Feeding by bottom side H1 is
connected to source side and H2 to receiver side.
If the 2000/6300 current transformer is used:
signals SG1 and SG2 must be wired in series, signals
X1 and X2 must be wired in parallel.
Catalog Numbers
ratings (A)
400/2000
NW
33576
34035
1000/4000
34035
2000/6300
48182
b Cable cross-sectional area to 0.4 to 1.5 mm2
b Recommended cable: Belden 9552 or equivalent
b Terminals 5 and 6 are exclusives:
the terminal 5 for Masterpact NW08 to 40
the terminal 6 for Masterpect NW40b to 63.
H1 is connected to
source side and
H2 to receiver side.
DB117311
DB117310
External transformer for source
ground return GFP protection
It is installed on the from LV transformer starpoint to the
ground link and is connected to Micrologic 6.0 trip unit
by “MDGF summer” module to achieve the ground
fault protection of SGR type.
NT
Cabling protections:
b unshielded cable with 1 twisted pair
b shielding connected to GND on one end only
b maximum length 150 meters
Catalog Numbers
Current Transformer SGR
33579
MDGF module
48891
39