Direct-current High-breaking Miniature Circuit Breaker-FTBD


Used in power supply & distribution line for overload & short circuit protection , also can be used for line non-frequent on-off operation and conversion. Specialized in communication and PV direct current (DC)system.

Technical data

Product illustration

Tripping characteristic

Exterior and dimensions

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Model & Spec FTBD
Technical parameters
Standards GB/T14048.2/IEC60947-2
Certifications CCC
Pole number 1P, 2P
Rated current(A) 1, 2, 3, 4, 6, 10, 16, 20, 25, 32, 40, 50, 63
Electrical characteristics
Rated operating voltage Ue(V) DC125/250 (1P)  DC250/500 (2P)
Rated insulation voltage Ui(V) DC500
Rated impulse withstand voltage Uimp(kV) 4
Rated short-circuit capacity lcn(kA) 1P (1A~4A) : 6.5 kA (125V/250V)
1P (6A~63A) : 20kA (125V)  10kA (250V)
2P (1A~4A) : 6.5kA (250V/500V)
2P (6A~63A) : 20kA (250V)  10kA (500V)
Dielectric voltage, power frequency, 1min(kV) 2
Isolation function Yes
Class of pollution 2
Use cat. (overvoltage category) ll
Thermomagnetic tripping characteristics 1.05ln/1.3ln (long delay setting current multiple)  8ln~12ln (short-circuit protection characteristics)
Mechanical charateristics
Contact status indicator Green: open  Red: close
Mechanical life (times) 20000
Electerical life (times) 10000
IP rate IP40 (installed inside the distribution box)
Mechanical shock resistance (GB/T2423.5)(m/s²) 150, continuously 11ms half-wave
Anti-vibration (GB/T2423.10) 5g-20 cycles, frequency 5…150…5Hz (load 0.8ln)
Anti-humid heat (GB/T2423.4)(℃/RH) 28 cycles (with 55/95…100)
Reference ambient temperature (℃) 30
Operating ambient temperature (℃) -5~+40
Storage temperature (℃) -40~+70
Installation characteristics
Terminal type U-shaped terminal, tunnel type
Max. wiring capacity Conductor connection 25 mm², busbar inlet thickness 0.8-2 mm
Max. ultimate torque (N.m) 5.1 (≤25A)  5.6 (>25A)
Tool Pozi drive (double cross)
Installation Installation on standard DIN rail (35mm)
Inlet method Pay attention to the polarity
Outline dim. (mm)
1P 80*18*74.2
2P 80*36*75.7




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