System information

™
Masterpact™ NT and NW Universal Power Circuit Breakers
Accessories
39
05/2014
© 2000–2014 Schneider Electric
All Rights Reserved
Terminals
Spring-Charging Motor (MCH)
The spring-charging motor automatically
charges the spring mechanism for closing
the circuit breaker and also recharges the
spring mechanism when the circuit
breaker is in the ON position.
Instantaneous reclosing of the circuit
breaker is thus possible following circuit
breaker opening. The spring-mechanism
charging handle is used only as a backup
if auxiliary power is absent.
The spring-charging motor is equipped as
standard with a limit switch contact (CH)
that signals the charged position of the
mechanism (springs charged).
Table 31: Terminal Characteristics
Standards UL 486E
Termination Capacity
22–14 AWG solid or stranded wire with max. O.D. of insulation
3.5 mm
Current
Nominal 10 A
Minimum 100mA at 24 V
Pull-Out Forces
22 AWG = 4.5 lbs (20 N)
20 AWG = 6.75 lbs (30 N)
18 AWG = 6.75 lbs (30 N)
16 AWG = 9 lbs (40 N)
14 AWG = 11.5 lbs (50 N)
Table 32: Spring-Charging Motor Characteristics
Characteristics MCH
Voltage Ratings (V
n
)
Vac 50/60 Hz 48/60, 100/130, 200/250, 240/277, 380/415, 400/440, 480
Vdc 24/30, 48/60, 100/125, 200/250
Operating Threshold 0.85 to 1.1 V
n
Power Consumption 180 VA
Motor Overcurrent 2–3 x I
n
for 0.1 s
Charging Time 4 s maximum on NW, 3 s maximum on NT
Duty Cycle 3 cycles per minute maximum
Endurance
10,000 cycles for NW < 4000 A
5000 cycles for NW ≥ 4000 A
CH Contact 10 A at 240 V
Terminal
Spring-Charging
Motor (NW)
Spring-Charging
Motor (NT)