Re: Light for My NVR Switch

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Subject

Author

Date

Re: Light for My NVR Switch

Tony Jeffree

06-15-2008

Re: Light for My NVR Switch

mark

06-15-2008

Posted by Tony Jeffree on June 15, 2008, 4:18 am

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On Sat, 14 Jun 2008 12:46:50 -0700 (PDT), mark

>PS still looking for a cheap normal nvr .........cant find one under
>£19 inc postage ...

Go to RS componebts (http://uk.rs-online.com/web/) and search on "no
volt release switch". Several examples at under a tenner.

Regards,
Tony

Posted by mark on June 15, 2008, 5:49 am

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> On Sat, 14 Jun 2008 12:46:50 -0700 (PDT), mark
>

> >PS still looking for a cheap normal nvr .........cant find one under
> >=A319 inc postage ...

>
> Go to RS componebts (http://uk.rs-online.com/web/) and search on "no
> volt release switch". Several examples at under a tenner.
>
> Regards,
> Tony

I did go to the RS site yesterday

but the picture shown is generic ..and I'm unsure what I'm buying

just phoned maplins up in llandudno...and the guy there has no idea
what a no volt release switch is and cant find one in his catalogue .

i don't have the catalogue either

so it looks like I'm going to have to make my way to llandudno ...and
see what they have ..

i need quality crimp on connectors as well ...will see if maplins
stuff is up to the job.

all the best.mark

Posted by mark@ems-fife.co.uk on June 15, 2008, 6:08 am

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>
> just phoned maplins up in llandudno...and the guy there has no idea
> what a no volt release switch is and cant find one in his catalogue .
>
>
> all the best.mark

Trouble is the terminology.an NVR is a latched contact that opens when
the holding voltage is removed and has to be manually reset.
What I think you want is a contactor and overload to protect your
motor.If you ask for that people will know what you mean.
This lot here used to be very competitive on contactors.
http://www.chaloncomponents.co.uk/
Mark.

Posted by Tim Leech on June 15, 2008, 6:24 am

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On Sun, 15 Jun 2008 03:08:03 -0700 (PDT), "mark@ems-fife.co.uk"

>>
>> just phoned maplins up in llandudno...and the guy there has no idea
>> what a no volt release switch is and cant find one in his catalogue .
>>
>>
>> all the best.mark

>
>Trouble is the terminology.an NVR is a latched contact that opens when
>the holding voltage is removed and has to be manually reset.
>What I think you want is a contactor and overload to protect your
>motor.If you ask for that people will know what you mean.
>This lot here used to be very competitive on contactors.
>http://www.chaloncomponents.co.uk/
>Mark.

Yes machine start/stop contactors are (usually) wired as NVR switches,
but some el cheapo machines are fitted with an NVR switch which
doesn't incorporate a contactor. I'm thinking of stuff aimed at the
DIY/small contractor market such as the little H-V bandsaws, some wood
planers etc.
There is I think some sort of legal requirement which these switches
are aimed to satisfy in the cheapest way possible.

Tim

Posted by houstonceng on June 15, 2008, 4:01 pm

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wrote:

> > just phoned maplins up in llandudno...and the guy there has no idea
> > what a no volt release switch is and cant find one in his catalogue .

> > all the best.mark

>
> Trouble is the terminology.an NVR is a latched contact that opens when
> the holding voltage is removed and has to be manually reset.
> What I think you want is a contactor and overload to protect your
> motor.If you ask for that people will know what you mean.
> This lot here used to be very competitive on contactors.http://www.chalonc=

omponents.co.uk/

> Mark.

Actually, a number of NVRs from well known makers don't have a
solenoid operated electro-mechanical contactor, but are able to be
mechanically latched when mains is present and the ON button is
pressed. No mains releases the mechanical latch as does the overload
(overcurrent detection) mechanism and the OFF button.

The problem for anyone not familiar with motor control circuitry is
that one can find the same type of devices listed on different
stockist's catalogues and by different manufacturers as :-

Direct On-line Starters
Motor Control Switches / Starters
No-volt release switches (NVR)
Mains contactors
Motor Switches
Motor Starters
etc, etc.
with or without overload / overcurrent protection.

No doubt, someone will tell us that the correct name is none of the
above - in the same way as a "light-bulb" is really a "luminaire".

I know what I want so I can look it up in the catelogues. In fact, I
sorted out the wiring on a mechancal "Motor Starter" for a fellow MEng
and bought an electro-mechanical type on e-bay which had over-current
protection that I removed, to make it into a simple contactor for use
with a 1-phase to 3-phase inverter. Not so easy if you're not familar
with them.

Regards
Andy

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