NS series moulded case circuit breaker is one of breaker which adopts international advanced design, manufacture technology to develop. The rated insulating voltage is 750V, suitable for AC 50Hz(60Hz),rated working voltage 690V or below, rated working current is 12.5A to 1250A of circuit and used in distributing electric energy, and non-frequent breaking in the normal conditions , protecting the current? equipment from overload?under voltage, circuit breaker with rated frame current 400A or below,can be used in mousecage motor’s non-frequent start, breaking during working, protecting motor from overload, short circuit?undervoltage,the product conforms to IEC60947-2 standard.
Technical parameter
Type
Pole number
Rated insulating voltage (v)
Rated operating voltage (v)
Rated ultimate short circuit breaking capacity Icu (KA) at 380/415V
Rated servies short circuit breaking capacity Ics at 380/415v
Operation performance
Utilization category
ON
OFF
NS-250N
3, 4
pole
750
690
and
below
36
36
1000
7000
A
NS-250H
70
70
NS-250L
150
150
Note:1. The N-pole breaker has no protection which closing and opening with the other three poles.
2. The type of thermal magnetic for NS-400/630 has no four poles.
Trip units main technical parameter.
Type
Rated current In (A)
Note
NS-100
12.5,16,20,25,32,40,50,63,80,100
T adjustable (0.8~1In)
M adjustable (5~10In)
NS-160
16,20,25,32,40,50,63,80,100,125,160
NS-250
160, 180, 200, 225, 250
NS-400
315, 350, 400
NS-630
400, 500, 630
Electronic release.
Type
Rated current In (A)
Note
NS-100
40, 100
Ir=0.4....1 * In(adjustable 48 setting)
Tripping between 1.05....1.3 * Ir (IEC60947-2)
(Long-time overload protection)
Im=2-3-4-5-6-7-8-10* Ir
(Short-circuit protection)
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