Overvoltage And Undervoltage Protective Device With Auto-Reclosing Function, which is shorted as OUPA.When the overvoltage and the undervoltage in the line exceed the specified value, it can automatically disconnect and automatically detect the line voltage. When the voltage in the line is restored to normal, it can be automatically closed. It is mainly used for power distribution in family and shopping malls (single phase AC230V, three-phase four wire AC400V) lines as overvoltage, undervoltage, phase interruption and broken line protection.

Technical data

Product illustration

Tripping characteristic

Exterior and dimensions

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Model & Spec FTB-Z
Technical parameters
Standards JB/T12762-2015
Certifications CCC
Pole number 1P+N, 3P+N
Rated current(A) 20, 25, 32, 40, 50, 63, 80
Overvoltage protection value(V) 275±5
Overvoltage restoring value(V) 250
Undervoltage protection value(V) 160±5
Undervoltage restoring value(V) 195
Overvoltage protection delay(s) 3 (275s)
Undervoltage protection delay(s) 0.6~5
Restoring time 25
Indicator Running indicator-always on: good running; Running indicator-flicker: automatically closing delay
Overvoltage indicator-always on: overvoltage protection off; Undervoltage indicator-always on: undervoltage protection off
Electrical characteristics
Rated operating voltage Ue(V) AC230(1P+N)  AC400(3P+N)
Rated frequency(Hz) 50
Rated insulation voltage Ui(V) 500
Rated short-circuit breaking capacity lcn(kA) 6
Rated impulse withstand voltage Uimp(kV) 6
Dielectric voltage, power frequency, 1min(kV) 2 (need to switch off the control source)
Impact resistance(waveform 8/20)(kA) 3
Isolation function No
Class of pollution 2
Use cat. (overvoltage category) ll
Mechanical charateristics
Mechanical life (times) ≥100000
IP rate IP40 (installed inside the distribution box)  IP20 (installed directly)
Mechanical shock resistance (GB/14048.1) 150, impact 10 times, Height 10cm
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) 6
Tool Pozi drive (double cross)
Installation Installation on standard DIN rail (35mm)
Inlet method Upper or lower
Outline dim. (mm)
1P+N: 80*36*66  3P+N: 80*108*66

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