Radin Electric Technology Co.,Ltd |
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Adjustable MCCB Electrical Circuit Breaker Compact Mould-case Circuit Breakers MCCB (SMT6)
Product overview |
STM6, STM6LY, STM6RT, STM6E and STM6EL series of circuit breakers
are new upgraded circuit breakers researched and developed by the
company combined with the advantages of similar international
products and demand of domestic and international markets.
With insulation voltage up to 1000V, the circuit breaker is
applicable for distribution systems of AC50Hz, rated working
voltage 690V and rated working current from 10A to 800A, used to
distribute electric power energy, protect circuits and power
equipment against overload, short circuit, undervoltage and so on,
also can be used for infrequent startup of motor and protect it
from overload, short circuit or undervoltage.
It is featured with small size, high breaking, short flashover,
etc., is the ideal product for users. It can be vertically
installed or horizontally installed.
STM6DC series DC moulded-case circuit breaker (hereinafter referred
to as circuit breaker) is suitable for DC systems of rated voltage
up to and including DC 1000V and rated current 10~800A, used to
distribute electric power energy, protect circuits and power
equipment against overload, short circuit and so on.
The products can be fed with wires from top and bottom, and it is
polarity-free.
It complies with the standards IEC60947-2, GB14048.2, etc.
Product features |
Feature 1: current limiting capacity
Current-limiting refers to limit of the increase of short-circuit
current in the loop, and in the loop protected by STM6, peak value
of the short-circuit current and the I2t energy in the circuit will
be much smaller than the prospective value.
U-shaped static contact
Unique U-shaped static contact can achieve pre-breaking technology:
The so-called pre-breaking technology refers to when short-circuit
current flows through the contact system, electric power generated
by U-shaped static contact and moving contact is mutual exclusive.
The greater the short-circuit current is, the greater the repulsion
of the electromotive force, and it is generated together with the
short-circuit current at the same time. Before the trip action
occurs, the electrodynamic repulsion force can make the static and
moving contact separation, by increasing the arc to increase the
equivalent resistance between them to achieve the purpose of
suppressing increase of short-circuit current.
Feature 2: modularized accessories
Accessory: For the circuit breakers of the same frame, they has
uniform sizes regardless of the breaking capacity and rated
current;Accessory: Users can freely
choose and expand functions of circuit breakers according to their
needs
Modularized accessories have insulation function, which is easy for
hot-line operation and installation.
Feature 3: miniaturized frame, compact design
5 frame sizes: 125 type, 160 type, 250 type, 630 type, 800 type
Rated current of STM6 series 10A~800A
Feature 4: 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.
Feature 5: 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.
Feature 6: modularized arc extinguishing system
Feature 7: 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
1 Auxiliary switch | 5 Terminal cap | 9 Manual operation |
2 Alarm switch | 6 Phase partition | 10 Plug-in type back-board wiring |
3 Shunt release | 7 Front-board wiring | 11 Back-board wiring |
4 Undervoltage release | 8 Electric operation |