FTB – ZK  Distributed Type Circuit Breaker for PV Grid-tied System. A miniature circuit breaker with short-circuit and overload protection as the main switch is equipped with an ultra-small intelligent electro-operation module with a self-resetting function to automatically control the opening or closing of the circuit breaker through the detection of the voltage signal, and also has a remote passive signal control function.

Technical data

Product illustration

Tripping characteristic

Exterior and dimensions

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Model & Spec FTB-ZK
Technical parameters
Standards GB/T10963.1 JB/T12762-2015
Certifications CCC
Pole number 1P+N, 2P, 3P+N, 4P
Rated current(A) C Type 6, 10, 16, 20, 25, 32, 40, 50, 63
D Type 6, 10, 16, 20, 25, 32, 40
Rated frequency(Hz) 50
Remote control signal Passive pulse
Overvoltage protection value(V) AC275±5
Overvoltage restoring value(V) AC250
Undervoltage protection value(V) AC160±5
Undervoltage restoring value(V) AC195
Undervoltage protection delay(s) 0.6~5
Overvoltage protection delay(s) 3 (275V)
Restoring time 25
Indicator Overvoltage protection: red-always on; Undervoltage protection: red-flicker; Running: green-always on; Closing delay: green-flicker
Running/maintenance Running mode Switch off automatically once detects over/undervoltage, and switch on automatically at voltage recovery, also can be remotely controlled
Maintenance mode The switch is opening and locked, and unable to switch on by manual
Remote control Remote closing: 1-3 trigger; Remote opening: 2-3 trigger; it is in opening locked state after opening
Electrical characteristics
Rated operating voltage Ue(V) AC230(2P)  AC400(4P)
Rated insulation voltage Ui(V) AC400
Rated short-circuit breaking capacity lcn(kA) 6.5 (FTB2)  10 (FTB3 40A~63A)  12 (FTB3 6A~32A)
Rated impulse withstand voltage Uimp(kV) 6
Dielectric voltage, power frequency, 1min(kV) 2 (need to switch off the control source)
Isolation function Yes
Class of pollution 2
Use cat. (overvoltage category) ll
Tripping type and charateristics C-type curve (5ln~10ln)  D-type curve (10ln~20ln)
Mechanical charateristics
Contact status indicator Green: open  Red: close
Mechanical life (times) 10000/6000
IP rate IP40 (installed inside the distribution box)
Mechanical shock resistance (GB/14048.1) 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
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 inlet
Outline dim. (mm)
1P+N/2P: 80*54*75.7  3P+N/4P: 80*90*75.7

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