Special Circuit Breaker

If it looks a bit like this:

then it is a contactor, being an electrically-operated switch. They are found in motor starters, among other places.

i think it is not a contactor, because it's control unit use the voltage signal from incoming feeder (circuit breaker before it, indiagram)

Can you take and post a photograph? Even a webcam picture would help.

Are there any markings on the broken device? Manufacturer's name, part numbers etc?

sorry, i don't have any other it's information, i have only it's diagram, i mark it by a rectangular in the drawing, in this diagram you can see that: control unit use two signal: voltage signal from incoming feeder and other signal from remote control

Thank you for your assistance

Conveo,

Appears to be a 48 volt coil operated switch that is activated from a remote location. Once the MCB is closed, power is than available at the remote switch to activate the coil, closing the switch.

Jerry D.

Seems like a contactor with 48V Dc coil.

You can replace the device with a contactor/ MCB with 48V DC coil and 220V/16A contact rating.

Dear

It seams to be 48 V DC contactor, but for the contactor coil you have tapped the supply from the outgoing of MCB (It means contactor should operate only when the MCB is in closed condition).

My doubt is whether the incoming supply is AC or DC (u have mentioned it as 16 A 1Ph MCB).

If it is DC then tapping power from the outlet of the MCB for contactor coil and is being closed from an remote location command (Where the contactor coil circuit is closed).

If it is AC then the circuit is wrong.

Anbarasu.pr, I think you have hit on the problem.

The device is a 48V coil relay/contactor with a contact rating of 230V/16A BUT nowhere on the diagram does it mention the supply rail voltage. The circuit breaker is

16A single pole NOT single phase! It looks like his supply rail is 48V!

There is a possibility that he has 110Vac as a rail and that the contactor is switched via a diode which would have the effect that the contactor would not be prone to buzzing but I don't think that is likely.

CONVEO can you confirm what voltage is on the supply rail?

regards

Chas

Could it be a shunt trip circuit breaker?

control unit: auxiliary voltage is 48VDC

power unit: rate voltage 220VAC

rate current 15A

Looks like a hold in circuit! Could be a simple 48V control n/o relay!

It may be vacuum contactor.

It is a relay (contactor) with 48 V trigger (coil voltage)

Thank a lot everybody.

through the diagram, all of us can guess the principle of this device, but it is a complex device ( it includes power unit and control unit, they are in one cover). i don't want to replace its by new circuit that me and you can design.

So i don't know how can buy it, anybody encountered its, so that you can help me.

Hi Conveo,

In which case it is probably a soft start unit. Thus the 48V is derived internally

and does not refer to an external 48V source. From this we would suppose that the load is a motor of some sorts. This is quite common in that it will have semiconductors ramping up the voltage and then have a contact close over them to reduce the losses. The contact rating is fairly light (i.e. I_TH) as it is not making or breaking the load.

Chas

Hi,

I'm not sure that I can help, but here is my idea.

Work out the problem from the other direction.

1.) Start out with the actual motor, or light, or device that is going to use the electricity.

2.) Find out exactly how much voltage, amperage, cycles per second, etc. the device needs to work properly

3.) Find a switch or circuit breaker to match what the device needs.

This should work better than simply trying to re-create the circuits from the pieces that you have. For example, I worked at a machine shop that had a planer. We set a block of steel upon the bed of the planer and bolted it down with side bolts. Then we set the tool, which was attached to a very, very large steel bridge spanning the space above the steel. The we turned the machine on. The entire bed, with 8,000 pounds of steel on it, moved in one direction, underneath the tool, which cut a path about 1/16th of an inch deep and 1/16th of an inch wide. Then the bed stopped, and reversed direction.

What powered such a powerful machine? A D.C. motor! Yes, the machine used Direct Current motors, because they can produce the most amount of torque at zero rpm. They are often used in applications such as elevators, when a tremendous amount of power is required immediatly at start-up.

However, the relays that we used on this machine were rated for A.C. voltage. We used relays that were rated for a much higher A.C. voltage and amperage, which were probably chosen by the company engineer.

I hope that this is helpful.

If not, good luck!

Tom

hello,

I had seen similar old stuff like you ....thia MAY BE A TIMER. OR A VOLT RELAY