CNSD Moulded Case Circuit Breaker

CNSD Moulded Case Circuit Breaker
CNSD Moulded Case Circuit Breaker
CNSD Moulded Case Circuit Breaker
CNSD Moulded Case Circuit Breaker
CNSD Moulded Case Circuit Breaker

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  


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.

 Chart B-2:DB112025

Protection of distribution system

DB112019:LED indications


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.


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).


Overload indication by alarm LED on the front; the LED goes on when the current exceeds the long-time trip threshold.


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.

Micrologic 5.0

Overall dimensions&Mounting dimensions

CNSD100 TO 250

TMD magnetic trip units,tripping curves protection of distribution systems

CNSD400 TO 630

CNSD500 TO 1600

lg=ln x... A B C D E F G H J
ln<400A 0.3 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
400A≤In≤1200A 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
ln>1200A 500 640 720 800 880 960 1040 1120 1200
Model Qty/CTN(pcs) GW(kg) NW(kg) Carton Size(cm)
CNSD-100 3P 12 21.5 29.2 42.5*40*24.5
CNSD-100 4P 8 18.6 16.8 40.5*29*31
CNSD-160 3P 12 22 19.7 42.5*40*24.5
CNSD-160 4P 8 19.4 17.6 40.5*29*31
CNSD-250 3P 12 24 21.5 42.5*40*24.5
CNSD-250 4P 8 21 19.2 40.5*29*31
CNSD-400 3P 4 24 21.5 33*31*30.5
CNSD-400 4P 4 30.5 27.5 48.5*29.5*23
CNSD-630 3P 4 24.8 22.3 33*31*30.5
CNSD-630 4P 4 31.5 28.5 48.5*29.5*23
CNSD-800 3P 1 14.1 12 45.5*35.5*31.5
CNSD-800 4P 1 18.2 15.4 44.5*36*42.5
CNSD-1600 3P 1 14.4 12.3 45.5*35.5*31.5
CNSD-1600 4P 1 18.8 16 44.5*36*42.5

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