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View Full Version : please tell me what is the difference between these two ? and which is best?



Alistair Hosie
09-04-2014, 02:27 PM
Saw these on ebay . I don't know which is best ! and what the difference between them is ,with regards to a cam etc on the switch? they seem very cheap and I like the idea of haveing a few forward reverse switches Alistair





http://www.ebay.co.uk/itm/121126107066?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT



http://www.ebay.co.uk/itm/331199000078?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

boslab
09-04-2014, 03:21 PM
They both probably have the same guts, the similarity is striking, same colour moulding etc
Mark

RichR
09-04-2014, 03:40 PM
The first one is rated 380V@15A
The second one is rated 380V@60A

The first one described as "used to start forward or backward and stop directly three-phase asynchronous electric motor"
The second one described as "6 Terminals: 2 Straight, 4 Cross"

KJ1I
09-04-2014, 06:05 PM
One mounts horizontally. The other mounts vertically.

duckman
09-04-2014, 06:13 PM
30 amps and 63 pence difference.

_Paul_
09-04-2014, 07:59 PM
I think you need to see some kind of wiring diagram for the possible contact permutations, the "traditional" Dewhurst & Partner reversing switch has 8 contacts the ones you are looking at the first one only has 6 contacts and the other 10.

http://cdn.instructables.com/FNG/ER5L/HFD1E1AM/FNGER5LHFD1E1AM.MEDIUM.jpg

http://cdn.instructables.com/FKG/KDDS/HFD1E2MB/FKGKDDSHFD1E2MB.LARGE.jpg

Paul

PStechPaul
09-04-2014, 10:23 PM
I think these switches may be different and depend on whether they are single phase or three phase. Here is a source for several such switches:

http://electricmotorwarehouse.com/drum_switch.htm

I found this for a single phase switch:

http://electricmotorwarehouse.com/IMAGES/RS1A_diagram.jpg

And this for single and three phase:

http://electricmotorwarehouse.com/IMAGES/RS1_diagram.jpg

This may help as well:
http://electricmotorwarehouse.com/PDF/6C014_Wiring_Diagram.pdf

It may be wise to pay a bit more for a known name brand. These switches handle a lot of power and things could get exciting if some part breaks or comes loose.

Paul Alciatore
09-04-2014, 10:39 PM
Neither one has any details on the schematic of the switching action so it is impossible to say what either of them may or may not do. Perhaps you can find some details on other (the OEMs?) internet sites. That is, if they even bother to have a site.

Or post a question on the sales offer pages that you listed above. E-bay still has the question option.

flylo
09-04-2014, 11:01 PM
One is a chinese pc of crap. The other is a rainproof chinese pc of crap that cost a bit more. Well you did ask.

malbenbut
09-05-2014, 02:18 AM
They are both green so you wont have to paint them.

MBB

Alistair Hosie
09-05-2014, 04:07 PM
Good answer green is fine by me LOL and thanks guys I am very grateful There are times in the past when I was put off buying these as they are normally very expensive. I will keep my eye open for a decent used western version. Alistair

Rosco-P
09-05-2014, 06:37 PM
Thread locked due to meaningless title.

alanganes
09-06-2014, 10:05 AM
Thread locked due to meaningless title.


Now that's funny!

Deja Vu
09-06-2014, 10:39 AM
I have the 30 Amp model. I think the contacts and actuation are quite adequate. I got it for my 24VDC hydraulic pallet stacker(elevator). I only use the forward circuit as I don't need a reversing circuit. Gravity along with a relief valve takes care of the reverse. I was impressed when I got it considering the price.

Here's where I got mine:
http://www.ebay.com/itm/270616419014?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Paul Alciatore
09-06-2014, 01:10 PM
The term "drum switch" only refers to the style of the switch. The general method of construction, the fact that it has a knob or lever that is rotated to use it, and the internal, rotating mechanism which is usually suitable for heavy, inductive loads. It says nothing about the contact arrangement or it's suitability for any particular switching task.

If you need a control for a machine or something, you should FIRST determine exactly what that switching task is. How many wires need to be switched? How many different positions should the switch have? What Voltage rating does the switch need? What current rating? Is it going to be used for an inductive load? Etc. In other words, you need to determine the specifications first. "Spec. it out!"

Drum switches are made with many different contact arrangements. These are usually set up in a way that allows them to be used more than one way. Sometimes it is hard to determine if a particular arrangement will work for you particular need. Most drum switches come with drawings of a number of ways to use that switch. It is not easy, but you need to look at those drawings for the switch you are considering to determine if that switch is suitable.

As for the quality of an imported switch, I have absolutely no experience or idea. Sounds like a c^@P shoot to me.