17 Years manufacturer Miniature Circuit Breaker FTB1 Wholesale to Hungary
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
DC Hipots can be used for the following testing applications: cable, transformers, electrical switchgear, terminations, motors generators and other electrical apparatus.
Today we’re going to take you behind-the-scenes to do a live test with our 800PL series Portable DC Hipot Testers. Here at HAEFELY HIPOTRONICS we always stress the importance of safety. So be sure to check with your own company’s guidelines for personal protective equipment.
This unit is our 880PL DC Hipot tester. It’s capable of putting out 80kV at 10mA. Other models in the 800 series follow a similar testing procedure, but today I’m demonstrate testing on a 15kV-rated URD cable.
While the power is off, connect ac power supply to the unit and 120V/60Hz power strip. Also, connect high voltage, ground, and return leads. Then connect the other ends of your leads back to your unit. Also, be sure your interlock plug is connected.
Now it’s time to make sure that all nonessential personnel are out of the testing area so you can begin your test. Set your current range to max, and set your voltage range to the desired setting. My cable is only rated for 15kV, so I’m going to use the lowest 0-20kV setting. Make sure your voltage control is lowered all the way to zero. Turn on the ac power switch, and this beacon here will light up to indicate there is power to the unit.
From a safe position, turn on your high voltage. This beacon will light red indicating that you are ready to start your test.Slowly raise your voltage to the desired setting. For me, that’s going to be about 13kv. You can hold your voltage for as long as your test specifies.
Now that the voltage is holding on my device under test, I’m going to check the leakage current on the current meter.
Right now the current meter range is 0-10 ma. As you can see, the current is nowhere near 1 milliamp, so I’m going to adjust the current range to go into microamps. As you can see, we’ve got about 4 microamps of leakage current. Now I’m going to return my current meter to the 0-10 milliamp setting.
Our test has run long enough, so I’m going to go ahead and slowly lower my voltage back down. I’m going to turn my high voltage off, and my ac power off. It’s important to make sure your unit is properly grounded, so I’m going to use a grounding stick. Now you’re ready to disconnect your specimen…and pack up the 880 for another test.
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Read our 800 Series Datasheet.
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HAEFELY HIPOTRONICS has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice.
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