China 10ka Residual Current Circuit Breaker

Sphere of application
KNL6 series Residual current circuit breaker(without over-current protection) is suitablefor the line of A and S 50/60Hz, voltage 230V(2pole)/400V(4pole), rated current up to 80A. Whenthere is human electricity shock or if the leakage current of the line exceeds the prescribedvalue, it will cut off the power rapidly to protect human safety and prevent the accident due to the current leakage. It can be used as infrequent changeover of the line in normal situation.It is applicable to industrial site, commercial site, tall building and civil house.
It complies with standard of IEC/EN61008.1 and GB16916.1.

Basic specification and main parameters

frame

63A

Rated working voltage

230/400V

Rated frequency

50/60Hz

Rated working current

16,25,40,63A

Rated residual operating current

0.03,0.1,0.3,0.5A

Rated residual un-operating current

0.015,0.05,0.15,0.25A

Sensibility

A Type,AC Type,S Type

Maximum operating time

In t≤0.1s , 5In t≤0.04

Rated making and breaking capacity

In≤50A 500A,In=63A 630A,In=63A 1500A

Limiting value of un-operating current

6In

Rated limiting short-circuit current

10000A

Pole number

2,4P

Mechanical life

20000

Electric life

4000

Operation principle
Each phase of conductor at the circuit breaker passes through the zero-sequence
current tr ansformer, and the secondary side of coil connects with the electromagnetic tripper.Under normal condition, the vector sum of each phase of current passing through zerosequence current transformer is zero. The flux of the zero-sequence current transformer is zero. And the secondary output voltage is zero and the circuit breaker doesn t zero,and the zero-sequence current transformer would produce the magnetic flux, and the secondary side of coil would output the voltage. once the leak current increases to drive the output voltage at the secondary side to grow to certain level, the electromagnetic release would activate to drive the operation mechanism to act to break the contact that connects the power, finally to realize the leak protection.