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What are the neutral current transformers used for ground fault sensing NT and NW Masterpact breakers?

FA234591

23 January 2021

Product Line:
NT and NW Masterpact breaker

Resolution:
 
 Table 41:        T-Frame Circuit Breakers
External neutral sensor for 3-phase, 4-wire residual ground fault system (or for neutral current monitoring).
These neutral sensors include their wiring harness. To order this harness as a spare part, order cat. no. NCTWIRING. 
 
NT Circuit Breaker
Sensor Plug
 External Neutral Sensor for general useExternal Neutral Sensor
Square D Panelboard
External Neutral Sensor for use in
Square D Switchboards
  External neutral sensor for circuit breakers with standard neutral protection
100–250 AS33575S33924S33926
400–1600 AS33576S33925S33927
  External neutral sensor for circuit breakers with oversized neutral protection♦
100 AS33575S33924S33926
250 AN/AN/AN/A
400–1000 AS33576S33925S33927
1200/1250 AS48896N/ANA
1600 AS48182N/ANA
♦Oversized neutral protection = 1.6xIr where Ir = long time pick-up.


Table 42:        W/Y-Frame Circuit Breakers
External neutral sensor for 3-phase, 4-wire residual ground fault system (or for neutral current monitoring) and external sensor for Modified Differential Ground Fault (MDGF) or Source Ground Return (SGR) system.
These neutral sensors include their wiring harness. To order this harness as a spare part, order cat. no. NCTWIRING.
 
 

Frame
Size
 

Sensor Plug (A)
External Neutral SensorPZ4 External Neutral Sensor
(For use in PZ4 Switchgear)

 
MDGF/ SGR
Sensor►
 
For Residual Ground Fault
For 3-Pole Circuit Breaker with
Oversize Neutral
Protection♦
 
For Residual Ground Fault
For 3-Pole Circuit Breaker with
Oversize Neutral
Protection♦
 





W
100 S48916S48916 S48902S48902 
250N/AN/A
400 


S34036
 
S34036
 


S48903
 

S48903
 



S33579
600/630
800
1000
1200/1250S48896
1600 
S48182
 


N/A
2000S48896
2500 

S48182
 

S48182
3000 
N/A
3200
4000N/A
 



Y
2000 



S48897•
 

S48897•
 

S48898•
 
S48898•
 



S33579
2500
3000 


N/A
3200
4000
5000 
N/A
 S48897•
6000
6300N/A
•Kit includes qty. (2) neutral sensors.
►Four MDGF sensors (phase + 1 neutral) are required for W-frame; eight MDGF sensors are required for Y-frame. For SGR system, only one sensor (neutral) is required for W-frame; two sensors for Y-Frame.
        An MDGF/SGR ground fault interface module (Cat. no. S48891) is also required for each circuit breaker. 
♦Oversized neutral protection = 1.6xIr where Ir = long time pick-up.

See catalog 0613DB1607 for more Masterpact parts