Miniature Circuit Breaker FTB1

Short Description:

Use for places that require higher electric safety and reliability. Insolating the electric equipment and meet the requirement of front and back overcurrent protection device selectivity.

  • FOB Price: US $0.5 - 9,999 / Piece
  • Min.Order Quantity: 100 Piece/Pieces
  • Supply Ability: 10000 Piece/Pieces per Month
  • Port: Shenzhen
  • Payment Terms: L/C,D/A,D/P,T/T
  • Technical data

    Product illustration

    Tripping characteristic

    Exterior and dimensions

    Related video

    Product illustration:



     Auxiliary contact Auxiliary contact and alarm contact  Shunt release Shunt release and auxiliary contact  Under voltage release  Over voltage release  Busbar mounting base  Motor-driven operation


    Product Features

    Under normal condition, the working principle of main thermostic bimetal in FTB1 SMCB is the same to the usual circuit breakers, it is used for overload tripping. when there is a short-circuit on a branch circuit breaker, the magnet core in the main current path would tilt the moving contact away from the fixed contact to break the circuit,thus producing the electric arc, and limiting the short-circuit current effectively.

    In the maintime,the short-circuit current flow to the supplementary current path, a selective resistor and a selective bimetal are connected in series of the supplementary curret path, limiting the short-circuit current to a few hundred amps.

    When the downstream circuit-breaker has tripped because of a short-circuit, the contact tips reclose automatically through a simple spring-type system,ensuring other unaffected branch circuits continue in operation.If a short-circuit occur between the FTB1 and the downstream circuit-breaker, another bimetal release enables short-time delayed tripping,ensuring the contact tips remain in the open position enabling isolating.


    Scope of use

    It is primarily used in critical installations,for instance, office buiding, laboratory, theatre, museum, hotel, shopping mall, telecommunication, coal mine and shipping, chemical industry and metallurgy, industrial plants,medical and health care, bank and securities exchange,airport, underground express way, military establishment and similar loads that requires non-interrupted and reliable power supply.

    Technical Data

    Model FTB1-100
    Number of poles  ada
    Rated frequency: AC 50(60)Hz
    Rated voltage (V) AC 230/400
    Rated current (A) 20, 25, 32, 40, 50, 63,80,100
    Breaking capacity  Icn/Ics(KA) LH 15/7.525/12.5
    Rated impulse withstand voltage (kV) 6
    Tripping characteristic E
    Electric arc distance(mm) ≤35
    Mechanical life 10,000
    Insulation function yes
    Pollution degree
    Ambient temperature (°C) -5°C ~ +40°C
    Altitude (m) Not higher than 2000m
    Installation Mounted on DIN rail, busbar adaptor or by screw terminal
    Connection capacity: Connection to cables,busbars or terminals
    Weight (g) 313      617       932       1241


     Trippping behavior


    Test Tripping characteristic Conventional non-tripping current Conventional tripping current Initial status Tripping time
    a b E E 1.05In 1.2In Cold statusRight after test 1 ≧2h﹤2h
    Test Tripping characteristic Delayed tripping current short-time delayed tripping current Initial status Tripping time
    c E 5In   Cold status 0.05s<t<5s(In≦32A)   0.05s<t<10s(In>32A)
    d E   6.25In Cold status 0.01s﹤t﹤0.3s

    Coordination table

    The FTB1 series operates selectively with respect to the combination with MCBs

    MCB(B,C characteristic) FTB1(Characteristic E)
    In A 20 25 32 40 50 63 80 100
    10 T T T T T T T T
    16 T T T T T T T
    20 T T T T T T
    25 T T T T T
    32 T T T T
    40 T T T
    50 T T
    63 T

    Note: T represents total selectivity



    Tripping characteristic

    adfa (3)

    Exterior and dimensions

    adfa (4)

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