Disjuntor Circuit Breaker

Disjuntor Circuit Breaker is a kind of switching device used to protect the circuit, when there is overload, short circuit and other faults in the circuit, it can quickly cut off the circuit to prevent the fault from expanding and damaging the equipment in the circuit. Due to its small size, light weight, easy installation and other characteristics, miniature circuit breaker is widely used in residential, commercial and industrial fields as a protection element for terminal appliances.

Model:STO

Send Inquiry

Product Description

Model	STO
Standard	IEC61009-1,IEC 60947-2
RATED SENSITIVITY l△n	300,500(mA)
Pole	2P,4P
Rated Short-circuit capacity(Icn)	3KA,6KA,8KA
Rated Current(In)	5~15A,15~30A,30~60A,60~90A(Current adjustable)
Rated Voltage(Un)	230/400V
Electro-mechanical endurance	over 6000 cycles

Structure and working principle

 Structure: miniature circuit breaker usually consists of contact system, arc extinguishing device, operating mechanism, disconnecting device and shell and other parts. Among them, the contact system is used to connect and disconnect the circuit; the arc extinguishing device is used to extinguish the arc when disconnecting the circuit, preventing the arc from harming the equipment and personnel; the operating mechanism is used to operate the circuit breaker manually or automatically; the release device is used to cut off the circuit automatically when the circuit is faulty.

 Working Principle: The working principle of miniature circuit breaker is based on the thermal and electromagnetic effects of current. When the current in the circuit exceeds the rated value, the bimetal will be bent and deflected by heat, releasing the mechanical latch and thus opening the circuit breaker contacts. At the same time, the electromagnet will also generate suction due to the excessive current, causing the striker to operate and cut off the circuit.

Advantages and Applications

Advantages: miniature circuit breaker has the advantages of small size, light weight, easy installation, long service life and high reliability. At the same time, it also has a variety of protection functions such as overload protection, short circuit protection, leakage protection, etc., which can ensure the safe operation of the circuit.

Applications: miniature circuit breakers are widely used in residential, commercial and industrial fields. In the residential area, it is usually used as a protection element in the distribution box to protect the safety of home circuits; in the commercial and industrial areas, it is used as a protection element for electrical equipment to prevent accidents such as equipment damage and fire caused by circuit failure.

Disjuntor Circuit Breaker