Molded Case Circuit Breaker with Electronic Over Current Release: The feature discriminating electronic circuit breakers from thermal-magnetic breakers is to control the over current releases with electronic circuits. Electronic control is performed via microprocessor. During design of the electronic circuit, worst possibilities to encounter in operation have been taken into consideration. In high circuit currents, direct opening has been ensured without operating electronic circuit.  Rated and Instant opening current adjustment areas of electronic circuit breakers are quite wide. This feature allows wide use opportunity to the breaker Furthermore, electronic circuit breakers are not affected by ambient temperatures.

EKM8E series electronic circuit breakers are applicable for low-voltage power systems of AC 50Hz, rated operating voltage up to 1000V and rated operating current from 16A to 1250A.

Ambient and installation conditions

● Altitude up to 2000m;
● Ambient medium temperature should be within -10℃ to +55℃;
● It can withstand the effect of damp air;
● It can withstand the effect of salt fog or oil mist;
● It can withstand the effect of moulds;
● It can withstand the effect of nuclear radiation;
● The max inclination is 22.5℃.
● It still can work reliably when the ship subjects to normal vibration;
● It can still work reliably if the product subjects to the earthquake (4g).
● Places where the surrounding medium is free from explosion danger, and far away from gas or conductive dust that would erode the metal or destroy the insulation;
● Keep away from rain or snow.

Product Features

● Circuit breaker can be equipped with undervoltage release, shunt release, auxiliary contacts, alarm contacts, electric operating mechanism, rotary operating handle and other accessories.
● Circuit breaker has protection functions of overload long delay, short-circuit short delay and short-circuit
instantaneous protection, the user can set the required protection characteristics (user only needs to operate the DIP switch for settings of protection function parameters).
● Circuit breaker has ground fault and thermal analog protection functions, pre-alarm indication over-current
indication, load current indication, digital current analysis technology, and it can achieve a higher level of protection.

Panel and function description

Panel adjustment knob as follows in turn:

● IR(A) Isd(x IR) Ii (x IR)
● IR: Overload long delay tripping setting current; Isd: Short-circuit short delay tripping setting current;
● Ii: Short-circuit instantaneous tripping setting current;

The rest parameters are set by factory default, or set by remote communication, as follows:

● tR: Overload long delay setting time, factory default: 60s;
● tsd: Short-circuit short delay setting time, factory default: 0.1s;
● Ip: Overload pre-alarm setting current, factory default: 0.85*IR;

Intelligent communication port (COM):

Panel With Residual Current Protection

1： Setting current in overload indicator, the red light will go on when the operation current is ≥ 105% In
2： Pre-alarm current Ip indicator, the yellow light starts flashing when operation current is ≥ Ipx90%
3： When operation current is ≥ 60% xln setting current, the green light will go on
4： The code switch for residual current setting
5： The code switch for leakage action time setting