Functions and characteristics
|Number of poles||3P, 4P|
|Control||Manual||with toggle/with direct or extended rotary handle|
|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|
|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|
|Protection||Chart B-1 B-2||Chart C-1|
|Indication and control auxiliaries|
|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:
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.
Protection of distribution system
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 thresholds and delays are set using the adjustment dials.
Offer standard long time delay setting module.
True rms long-time protection.
Thermal memory: thermal image before and after tripping.
Short-time(rms) and instantaneous protection.
Selection of lt type(ON or OFF) for short-time delay.
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.
Overall dimensions&Mounting dimensions
CNSD100 TO 250
TMD magnetic trip units，tripping curves protection of distribution systems
CNSD400 TO 630
CNSD500 TO 1600
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