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

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.

Yueqing Shendian Electrical Co., Ltd

Experience Member 0 Chinese Supplier

Recommended by CCCME