Big Discount Miniature Circuit Breaker FTB1 for Montpellier Factory
Exterior and dimensions
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|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|
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.
|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)|
The FTB1 series operates selectively with respect to the combination with MCBs
|MCB(B,C characteristic) FTB1(Characteristic E)|
Note: T represents total selectivity
Exterior and dimensions
How to teach Automatic reverse forward motor control with full practical HD video in Urdu-English,
Welcome of all viewer, you see automatic reverse & forward start-stop motor control with 2 Magnetic Starter,” Multi Timer,” Timer-1,” Timer-2,” Circuit hold relay, and power circuit 3 phase control with 3 phase supply, and control circuit connect to single phase supply.
Multi timer is different timer from timer- & timer-, Multi timer does control MC-1 (Rev) & MC-2 (fwd) both side control with timing, you can set manually timing multi timer “1 sec to 12 hr” multi timer is control motor running time and “T1 and T2″ control motor stop time.
Hold relay is control ON/OFF push button and use for circuit ON/OFF.
You can see this video full practical reverse forward motor control very easy you.
Circuit Diagram: https://3.bp.blogspot.com/-06b4uMigni4/VyCl-iAlSzI/AAAAAAAAAcc/7ejPA6AnO2sV7Jb7kpeUDy4TO4f5ltvOwCLcB/s1600/circuit%2Bwater%2Bmark.jpg
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