Electronic Type Circuit Breaker 250A MCCB Intelligent

STM6E and STM6EL 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 800A.
 
Features
1.Circuit breaker can be equipped with undervoltage release, shunt release, auxiliary contacts, alarm contacts, electric operating mechanism, rotary operating handle and other accessories.
2.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).
3.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.
3.STM6EL series is circuit breaker with residual current protection function.

Panel and Function Description: 


Tripping test port (TEST):
                   1Tripping test input DC12V(+)
                   2 Tripping test input DC12V(-)

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):
2: Power input DC24V(-) 5:485B-
1:Power supply input DC24V(+)
2:Power supply input DC24V(-)
3:485A+
4:485A+ 
5:485B-
6:485B-
7: Closing and opening common terminal of electric operating mechanism
8:Closing and opening common terminal of electric operating mechanism
9:Opening of electric operating mechanism
10:Closing of electric operating mechanism

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


Contact repulsion device (patented technology)

The technical scheme adopted by the invention is:
As shown in Figure 1, the new contact device is mainly consisted of static contact, moving contact, shaft 1, shaft 2, shaft 3 and springs;
When the circuit breaker is in the closed state, shaft 2 acts on the right side of the spring angle; When the circuit breaker has a large fault current, the moving contact will be subjected to the electric repulsion generated by the current itself, and rotate with the center of shaft 1, when shaft 2 rotates to the top of the spring angle with the moving contact, it makes moving contact to rapidly rotate upwards and quickly break the circuit upon the reaction of spring, it has enhanced the breaking capacity of the product through optimization of the contact structure.

Intelligent
Network communication is more convenient. It accesses to Modbus communication system through dedicated connection. STM6E / STM6EL with communication function can select monitoring accessories to realize door display, read, set and control.


Modularized arc extinguishing system 


Unification

The six series of STM6, STM6LY, STM6DC, STM6RT, STM6E, and STM6EL under the same frame size have the same dimensions, installation dimensions and appearance style, which is completely unified design.

Components of circuit breaker