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Next Shipping Day 3rd December

We are now in the process of moving Technobots 120 miles North to the Town of Rugby. You can still place orders on-line as normal but they will not be dispatched until after we re-open on the 3rd December

Machining Services

Our machine shop is also being re-located so we are unable to carry out machining modifications on gears, sprockets, pulleys etc. Any order placed which includes machining options is unlikely to be processed until mid December.


Switches

Technobots FAQ » Motor Speed Controllers & General Electrical » Electrical » Switches « Previous Next »

Author Message
Dave Arney
Unregistered guest
Posted on Sunday, March 4, 2007 - 2:43 pm:    Edit Post    Move Post (Moderator/Admin Only)

I need a switch.
I have two 12 volt rechargeable batteries fully charged. One is to be connected to an Inverter to boost it up to 230volts to run lights. One battery will not last for the length of time needed but two will. So I want a switch that both batteries can be connected to with a lead going to the Inverter so that when the first battery runs out I can simply flick a swith to bring the second one on line.
Can you supply such a switch.
Thanks
Dave Arney
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 421
Registered: 10-2004
Posted on Tuesday, March 6, 2007 - 7:25 pm:    Edit Post    Move Post (Moderator/Admin Only)

Hello Dave,

We do not carry general purpose switches although we do have power connectors that could be used. One important figure you did not mention is the switching current? Will you be turning the inverter off when changing batteries as that will influence the switch rating?
bobd
Unregistered guest
Posted on Monday, October 22, 2007 - 11:44 am:    Edit Post    Move Post (Moderator/Admin Only)

Hi Technical

I am trying to find a 3 position DPDT Rocker switch with centre off. The swith must automaticaly jump to the centre off position when not depressed, just the same as a lot of car electric window operating switches. Maplins cant supply such a switch. Could you sugest anyone.
Thanks
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 609
Registered: 10-2004
Posted on Monday, October 22, 2007 - 7:11 pm:    Edit Post    Move Post (Moderator/Admin Only)

Bob,

This is quite a common switch and should only cost a pound or two from suppliers such as RS Components. Check out their part number 495-4232 as an example.
John Rankin
Unregistered guest
Posted on Wednesday, June 18, 2008 - 6:57 pm:    Edit Post    Move Post (Moderator/Admin Only)

I need a replacement for a microswitch that controls a water pump. 230V single phase, 400W load. The spring-loaded actuating bar protrudes beyond the body; when the bar is pulled towards the body of the switch the circuit is opened.
I will try to append a pic. Can you help me please? Microswitch
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 812
Registered: 10-2004
Posted on Thursday, June 19, 2008 - 7:04 am:    Edit Post    Move Post (Moderator/Admin Only)

John,

We do not stock a direct replacement but our V3 size switches should be able to handle the load, see http://www.technobots.co.uk/acatalog/Online_Catalogue_Microswitches_364.html. The switches have a change over contact so that will give the correct switching operation. You can choose the length of the lever, it can always trim it if it is too long. The main problem for your application is that each switch has one of its contacts on the bottom.

Hope that is of some interest.
Andy
Unregistered guest
Posted on Saturday, August 16, 2008 - 3:08 pm:    Edit Post    Move Post (Moderator/Admin Only)

I'm not technically minded so here goes..
Do you do a micro toggle switch that I can use. (momentary switches one way only) IE the switch needs to be in the lower position with a lever against it (against the spring action) so that when I move the lever away it switches the switch off like wise when the lever moves back it pushes the switch down again against the spring to open the circuit again. The attachment shows a switch that will do the job but no idea where it came from

Regards
Andy
one way mini toggle switch momentary
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 853
Registered: 10-2004
Posted on Monday, August 18, 2008 - 1:47 pm:    Edit Post    Move Post (Moderator/Admin Only)

Andy,

Yes we do have toggle switches like you describe. See http://www.technobots.co.uk/acatalog/Online_Catalogue_Toggle_Switches_43.html and look for the term (on) which means momentary action i.e. not latching / spring return. Normally you would use a microswitch for that type of application, see http://www.technobots.co.uk/acatalog/Online_Catalogue_Microswitches_364.html for our range of these.
Steve (Extreme)
Member
Username: Extreme

Post Number: 1
Registered: 9-2009
Posted on Monday, September 28, 2009 - 7:26 pm:    Edit Post    Move Post (Moderator/Admin Only)

12V 20A DPDT Centre Off Toggle Switch - Part No: 1610-101

http://www.technobots.co.uk/cgi-bin/ss000002.pl?page=search&PR=-1&TB=A&SS=1610-1 01&ACTION=search

Will the above switch spring return to centre, thus only being momentary contact if pusher in either direction?
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 1124
Registered: 10-2004
Posted on Tuesday, September 29, 2009 - 9:44 pm:    Edit Post    Move Post (Moderator/Admin Only)

No, it's latching. The only spring return type we do is the miniature toggle type. Spring return is indicated by (on).
keith cliffe
Unregistered guest
Posted on Thursday, February 18, 2010 - 11:26 am:    Edit Post    Move Post (Moderator/Admin Only)

hi i recently bought off you some dpdp which are fantastic,i am building a points control box for a model train layout and need a bit of advice if you can help,what it is i need a swich that will give a qwick burst of current to change the point over but all stay on so my leds can show me which way the points are facing can you help in any way
keith
Admin (Admin)
Board Administrator
Username: Admin

Post Number: 1208
Registered: 10-2004
Posted on Thursday, February 18, 2010 - 9:30 pm:    Edit Post    Move Post (Moderator/Admin Only)

Keith, Not sure that I understand what you are asking. A switch is either open or closed so cannot in itself give a quick burst of energy. You say "all stay on so me LED's..." can you explain what you mean by this.

Not being a train enthusiast, I will still hazard a guess at what you are trying to achieve. You have a switch that operates the points with two positions. The switch stays put in each position (i.e. is not spring return or momentary), you have LED's connected to either side of the switch to show the points position. Assuming the points are spring return, you just need a burst of energy to switch over and then a holding current to keep them there. One way of giving a burst of energy and then a holding current is to have a resistor with a value to determine the holding current and connected in parallel with the resistor would be a large value capacitor. The value of capacitor would need to be either calculated or experimented with as it depends on how much current the points take and how long they take to move. If the points are not spring return, then it is be bit more complicated, if this is the case, do you have a sketch of your wiring that you can post on the forum so we can take a look.

 

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