CNSD Moulded Case Circuit Breaker
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- Company Profile
With 30 years experience, we produce quality MCCB with moderate price. Looking for dealer, wholesaler and other type of clients for further cooperation.
Functions and characteristics
| Item No. | CNSD100-250 | CNSD400-630 | CNSD800-1600 | |
| 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 | 800, 1000, 1250, 1600 |
| Rated insulation voltage(V) | Ui | 800 | ||
| Rated impulse withstand voltage(kV) | Uimp | 8 | ||
| Rated operational voltage(V) | Ue | AC 50/60Hz, 690V | ||
| Utilization category | A | |||
| Breaking capacity levels | F N H | N H | ||
| Breaking capacity (kA rms) AC 50/60 Hz 380/415 V | lcu | 36, 50, 70 | 50， 70 | |
| Service breaking capacity (kA rms) AC 50/60 Hz 380/415 V | lcs | 36, 50, 70 | 50， 70 | |
| Operation performance | Mechanical | 20000 | 10000 | 10000 |
| Electrical | 10000 | 5000 | 5000 | |
| Protection | Chart B-1 B-2 | Chart C-1 | ||
| Indication and control auxiliaries | ||||
| Auxiliary switch | ■ | ■ | ||
| MX Shunt coil | ■ | ■ | ||
| MN under-voltage coil | ■ | ■ | ||
Protection
Overload protection: Thermal protection (lr)
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:
lr that can be adjusted in amps from 0.7 to 1 times the rating of the trip unit(16A to 250A),
corresponding to settings from 11 to 250Afor 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.
TM-D: fixed pick-up, Im, for 16-160Aratings and adjustable from 5 to 10 x ln 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(Ir)
Inverse time protection against overloads with an adjustable current pick-up lrsetusing a dial and a non-adjustable time delay tr.
Short-circuit protection: Short-time protection with fixed time delay(Isd)
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.
Protection
Chart C-1
Protection thresholds and delays are set using the adjustment dials.
Offer standard long time delay setting module.
overload protection
True rms long-time protection.
Thermal memory: thermal image before and after tripping.
Short-circuit protection
Short-time(rms) and instantaneous protection.
Selection of lt type(ON or OFF) for short-time delay.
Neutral protection
On 3-pole circuit breakers, neutral protection is not possible.
On 4-pole circuit breakers, neutral protection may be set using a three-position
switch: neutral unprotected (4P 3d), neutral protection at 0.5lr (4P 3d +N/2) or neutral protection at lr (4P 4d).
lndications
Overload indication by alarm LED on the front; the LED goes on when the current exceeds the long-time trip threshold.
Test
A mini test kit or a portable test kit may be connected to the test connector on the front to check circuit-breaker operation after installing the trip unit or accessories.
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