Ordinary Discount Miniature circuit breaker-FTB3LE for Madras Factory


Technical data

Product illustration

Tripping characteristic

Exterior and dimensions

Related video

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Product illustration:


Technical Data

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)

AC A 3030,50

Rated residual non-operating current(mA)

ACA 1515,25
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
Protection rating IP20
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
Altitude (m) ≤2000m
Relative air humidity no more than 95%
Pollution degree
Installation condition Used in place without obvious shock and vibration
Weight (g) 80 490 610 710 820

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

  • 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.

    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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