Ordinary Discount Miniature circuit breaker-FTB3LE for Madras Factory
Exterior and dimensions
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|Model||FTB3LE Residual current circuit-breaker|
|Number of poles||IP+N,2P,3P,3P+N,4P|
|Rated frequency:||AC 50/60Hz|
|Rated voltage (V) AC||230/400|
|Rated current (A)||CD||6, 10, 16, 20, 25, 32, 40, 50, 636,10,16,20,25,32,40|
Rated residual operating current(mA)
Rated residual non-operating current(mA)
|Residual current breaking time||30mA≦0.1s 250mA≦0.04s|
|Rated short-circuit breaking capacity (KA)||40～63A6～32A||1012|
|Rated residual current breaking capacity(KA)||4.5|
|Mechanical & electrical life:||20,000 operations|
|Installation||On DIN rail 35mm according to JB6525|
|Connection capacity:||Cross-section of conductors up to 25mm², Cross-section of busbar from 0.8-2mm²,reversibility of connections|
|Tightening torque||2 Nm|
|Ambient temperature (°C)||-5°C ~ +40°C|
|Relative air humidity||no more than 95%|
|Installation condition||Used in place without obvious shock and vibration|
Exterior and dimensions
|Number of poles||width(mm)||Modules|
|1 / 2||54||3|
|2 / 2||72||4|
|3 / 3||100||5.5|
|3 / 4||112.5||6.25|
|4 / 4||130.5||7.25|
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A Circuit Breaker (MCB) is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current. This video gives an brief explanation on working principles of Miniature Circuit Breaker, (MCB) with help of animation.
HOW DOES CIRCUIT BREAKER WORK:
Under overload condition, the current through the bimetal strip causes to raise the temperature of it. The heat generated within the bimetal itself enough to cause deflection due to thermal expansion of metals. This deflection further releases the trip operator ON/OFF and hence contacts get separated. In some MCBs, magnetic field generated by the coil causes develop pull on bimetal such that it deflection activates the tripping mechanism.
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