Thermal Magnetic Residual MCCB TDK5L

Scope of Application

TDK5L  series  molded  case  current  circuit  breaker  with  residual  current  protection  (hereinafter referred to as circuit breaker)is suitable for distribution network with a frequency of AC 50Hz,the rated working voltage of 400V,the rated insulation voltage of 1000V and the rated current of 800A.It can be used  to  provide  indirect  contact  protection  for  people,prevent  fire  danger  caused  by  grounding  fault current  caused  by  equipment  insulation  damage,distribute  electric  energy,protect  overload  and  short circuit of lines and equipment,and also be used for infrequent switching of lines and infrequent starting of   motors.

The rated residual current I△n and the maximum operating time of the rated residual current can be adjusted on site according to the actual situation;When the phase voltage is reduced to 85V,the leakage protection module can still work normally and has the function of leakage alarm output.

The  products  conform  to  IEC60947-2  standards.

Model and Meaning

Note: 4-pole product code

Type A: Overcurrent tripping element is not installed at N pole, and N pole is always ON andnot combined with other three poles.

Type B: Overcurrent tripping element is not installed at N pole, and N pole is combined with otherthree poles (N pole is combined first and then separated).

Classification of Circuit Breakers 

Classified according to the number of poles: 3-pole and 4-pole;

Classified according to the application: For power distribution and motor protection;

Classified according to the operation modes: Operated by handle, electric operation (denoted byP), operated by rotating handle (denoted by Z for switchgear).

Main Technical Parameters

Structure and Working Principler

Structure

The series of circuit breakers are electronic current-operated leakage protectors. The main components include main switch (including over.curent release), zero-sequence curent transformer,electronic amplification components,leakage release, test device, all of which are installedin a plastic housing.

Working principle

In case of any leakage or electric shock in the protected circuit, the zero sequence current transformer has a signal output. When the signaloutput reaches a certain value, it tnggers the thynistor to conduct and makes the leakage release act, thus drving the traction bar to disconnecithe operating mechanism in a short time and cut off the power supply, thus realizing the leakage protection function. (The schematic diagramof working principle is as follows)