Residual-current Operated Circuit Breaker-FTB3LE


Mainly used in distribution lines of AC 50HZ, rated working voltage 230/400V, rated current not more than 63A. For overload & short circuit protection, also can be used for line non-frequent on-off operation and conversion, and It can also be used for conversion of infrequent operation between lines under normal conditions.The breaking ability can reach 12kA.

Technical data

Product illustration

Tripping characteristic

Exterior and dimensions

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Model & Spec FTB3LE
Technical parameters
Standards GB/T16917.1/IEC61009-1
Certifications CCC
Pole number 1P+N, 2P, 3P, 3P+N, 4P
Rated current(A) Type C 6, 10, 16, 20, 25, 32, 40, 50, 63
Type D 6, 10, 16, 20, 25, 32, 40
Rated frequency(Hz) 50
Residual current characteristics (action type) AC, A
Rated residual operating current lΔn (mA) 30 (Type AC)  30, 50 (Type A)
Actuation time (ms) <100
Electrical characteristics
Rated operating voltage Ue(V) AC230 (1P+N, 2P)  AC400 (3P, 3P+N, 4P)
Rated short-circuit breaking capacity lcn(kA) 10 (40A-63A)  12 (6A-32A)
Rated impulse withstand voltage Uimp(kV) 4
Dielectric voltage, power frequency, 1min(kV) 2
Rated residual making capacity lΔm (kA) 4.5
Impact resistance (waveform 8/20) (kA) 3
Isolation function Yes
Class of pollution 2
Use cat. (overvoltage category) ll
Tripping type and characteristics C-type curve (5ln~10ln)  D-type curve (10ln~20ln)
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 Upper or lower
Outline dim. (mm)
1P+N 90*54*74.2
2P 90*72*75.7
3P 90*100*75.7
3P+N 90*112.5*75.7
4P 90*130.5*75.7




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