CNSX Moulded Case Circuit Breaker
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Functions and characteristics
| Item No. | CNSX100-250 | CNSX400-630 | |
| Number of poles | 3P, 4P | ||
| Control | Manual | with toggle with direct or extended rotary handle |
|
| Connections | Fixed | front connections | |
| Plug-in | front connections/rear connections | ||
| Electrical characteristics as per IEC60947 and EN60947-2 | |||
| Rated current(A) | In | 16,25,32,40,50,63,80,100,125,160,200,250 | 400,500,630 |
| Rated insulation voltage(V) | Ui | 800 | |
| Rated impulse withstand voltage(kV) | Uimp | 8 | |
| Rated operational voltage(V) | Ue | AC 50/60Hz,690 | |
| Utilization category | A | ||
| Breaking capacity levels | F N H | ||
| Breaking capacity (kA rms) AC 50/60 Hz 380/415 V |
lcu | 36, 50, 70 | |
| Service breaking capacity (kA rms) AC 50/60 Hz 380/415 V |
lcs | 36, 50, 70 | |
| Operation performance | Mechanical | 20000 | 10000 |
| Electrical | 10000 | 5000 | |
| Protection | Chart B-1 B-2 | ||
| Indication and control auxiliaries | |||
| Auxiliary switch | ■ | ||
| MX Shunt coil | ■ | ||
| MN under-voltage coil | ■ | ||
Protection
Overload protection: Thermal protection (Ir)
Thermal overload protection based on a bimetal strip providing an inverse time curve l2t, corresponding to a temperature rise limit. Above this limit, the deformation of the strip trips the circuit breaker operating mechanism.
overload protection has the following characteristics:
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lr that can be adjusted in amps from 0.7 to 1 times the rating of the trip unit(16A to 250A),
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corresponding to settings from 11 to 250A for the range of trip units.
Anon-adjustable time delay.
Short-circuit protection: Magnetic protection (Im) Short-circuit protection with a fixed or adjustable pick-up lm that initiates instantaneous tripping if exceeded.
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TM-D: fixed pick-up, Im, for 16-160A ratings and adjustable from 5 to 10 x In for 200 and 250A ratings.
Protection of distribution system
Protection
Settings are made using the adjustment dials with fine adjustment possibilities.
Overload protection: long time protection (lr)
lnverse time protection against overloads with an adjustable current pick-up lr set using a dial and a non-adjustable time delay tr.
Short-circuit protection: Short-time protection with fixed time delay (lsd)
Protection with an adjustable pick-up lsd.Tripping takes place after a very short delay used to allow discrimination with the downstream device.
Short circuit instantaneous protection: (li)
lnstantaneous short-circuit protection with a fixed pick-up.
