Wholesale Dealers of DC miniature circuit breaker-FTBD Wholesale to Turkey

Overview:



Technical data

Product illustration

Tripping characteristic

Exterior and dimensions

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Product illustration:

ftbd

Technical Data

Model FTBD DC miniature circuit-breaker
Picture  
Number of poles IP 2P
Rated frequency: AC 50/60Hz
Rated voltage (V) 125/250 250/500
Rated current (A) 1,2,3,4
Rated ultimate short-circuit breaking capacity(KA) 6.5
Rated current (A) 6,10,16,20,25,32,40,50,63
Rated ultimate short-circuit breaking capacity(KA) 20/10 20/10
Rated impulse withstand voltage Uimp(KV) 4
Mechanical and electrical life: 20000
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
Ambient temperature (°C) -25°C ~ +45°
Altitude (m) ≦4000m
Relative air humidity no more than 95%
Pollution degree
Installation condition Used in place without obvious shock and vibration
Weight (g) 116 232

Tripping characteristic

ftbd-5

Exterior  and dimensions

ftbd-6342

Number  of poles 1P 2P
A 80±0.8
B 74.2±0.8 75.7±0.8
C

17.8±0.8

35.6±0.8

D 44±0.8
E

68.7±0.8

70.2±0.8

F 45±0.8
G 35.5±0.8




This experiment proves that an AC circuit breaker should not be used at mains voltage levels on DC.
You may get away switching 12 or 24 Volts DC but the time delay is too much to maintain safe operating of the MCB at higher voltages.
Severe contact burn in will happen as a DC arc is more difficult to break.

Under the test conditions of 30 Amps AC. the 6 Amp breaker trips immediately.

Under test conditions of 30 Amps DC, It takes 11.5 seconds for a trip.
the later trip of about 6 seconds was due to the bimetallic strip being warm.

Even with the 4700µf capacitor some 100Hz ripple would be present under these load conditions.

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