Factory directly sale Miniature Circuit Breaker FTB1 Export to Monaco


Technical data

Product illustration

Tripping characteristic

Exterior and dimensions

Related video

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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

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Exterior and dimensions

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How can GE help your business save precious time when an arc flash occurs? In this video, watch a sequence of demonstrations showing how The GE Arc Vault™ protection system withholds the damage compared to a system without protection.

The first test is at 480V, 65kA, and 6 cycles, which translates to ~15cal/cm2 HRC3. You will see a box to the right of the screen where the arc flash is initiated. The box contains 3 bus bars, spaced one inch apart, and connected by stranded wire. The switchgear section is not used in this test. The speed of the video is slowed to 30% of real time.

The second test demonstrates the transfer of the arc from the initial location into the Arc Vault™ chamber. This test is also conducted at 480V, 65kA, and 6 cycles. In this clip, the Arc Vault™ device is installed in the switchgear section. The arc flash will be initiated in the same box, but the fault will be transferred to the Arc Vault™ in less than 8ms ~1.1cal/cm2 (HRC0). The speed and duration of this video is identical to Test 1.

Finally, a side-by-side comparison of the previous demonstrations proves how this technology adds value to your business through its superior features. The system will contain a flash in less than 8ms with the circuit breaker compartment doors open during operation and maintenance. The incident energy in accordance with IEEE 1584 at 18″ from the arc event will be less than 1.2 cal/cm², which is equivalent to HRC0, for a 480V HRG system with available fault currents up to 100 kA.

To get an in-depth tour of the major system components and user interfaces, watch: http://www.geindustrial.com/cwc/videos-media/?video_uuid=o8bl5eho&v=o8bl5eho&catid=13841, and read more at: http://www.geindustrial.com/cwc/Dispatcher?REQUEST=PRODUCTS&pnlid=5&famid=40&catid=82&id=arcvaultPS.

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