Needed: 100A contactors

[David Lesher]

I'm seeking some 80-100A contactors.

3P, Form B (or C), 24VAC coils, DIN rail mounting.

Any suggested PN's & sources?

--
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

 

[Tim Williams]

Cost target?

You can find those at any supplier (say, Mouser, Allied Electronics, etc.),
I'm guessing you've already searched and come up unsatisfied??

Tim

--
Seven Transistor Labs, LLC
Electrical Engineering Consultation and Contract Design
Website: http://seventransistorlabs.com

"David Lesher" <wb8foz@panix.com> wrote in message
newspcrk3$ejd$1@reader2.panix.com...

I'm seeking some 80-100A contactors.

3P, Form B (or C), 24VAC coils, DIN rail mounting.

Any suggested PN's & sources?

--
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

 

[David Lesher]

"Tim Williams" <tmoranwms@gmail.com> writes:

Cost target?

You can find those at any supplier (say, Mouser, Allied Electronics, etc.),
I'm guessing you've already searched and come up unsatisfied??

Tim

Mostly I've found null results for the specs.


--
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

 

[Tom Kupp]

Something like this https://www.relayspec.com/specs/026940/b101.pdf?

On 09/13/2017 11:04 PM, David Lesher wrote:

I'm seeking some 80-100A contactors.

3P, Form B (or C), 24VAC coils, DIN rail mounting.

Any suggested PN's & sources?

 

[David Lesher]

Tom Kupp <tjkupp@gmail.com> writes:

Something like this https://www.relayspec.com/specs/026940/b101.pdf?

On 09/13/2017 11:04 PM, David Lesher wrote:
I'm seeking some 80-100A contactors.

3P, Form B (or C), 24VAC coils, DIN rail mounting.

Any suggested PN's & sources?

Alas, those are single-pole. I need 2 or 3P. Looked at relayspec.com to no joy, either.

I have seen NC/DT contactors in many a panel, but I get Irma stole all the new ones.....



--
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

 

[Carl Ijames]

"David Lesher" wrote in message newspem8u$n5s$1@reader2.panix.com...

Tom Kupp <tjkupp@gmail.com> writes:

Something like this https://www.relayspec.com/specs/026940/b101.pdf?

On 09/13/2017 11:04 PM, David Lesher wrote:
I'm seeking some 80-100A contactors.

3P, Form B (or C), 24VAC coils, DIN rail mounting.

Any suggested PN's & sources?

Alas, those are single-pole. I need 2 or 3P. Looked at relayspec.com to no
joy, either.

I have seen NC/DT contactors in many a panel, but I get Irma stole all the
new ones.....
=======================================================

What voltage rating do you need on the contacts, and ac or dc?

--
Regards,
Carl Ijames

 

[David Lesher]

"Carl Ijames" <carl.ijamesXXX@YYYverizon.net> writes:

Tom Kupp <tjkupp@gmail.com> writes:

Something like this https://www.relayspec.com/specs/026940/b101.pdf?

Alas, those are single-pole. I need 2 or 3P. Looked at relayspec.com to no
joy, either.

I have seen NC/DT contactors in many a panel, but I get Irma stole all the
new ones.....
=======================================================

What voltage rating do you need on the contacts, and ac or dc?

240 VAC resistive; we are interupting both sides of a 240V circuit.

I'm having such a hard time finding DPNC 100A contactors that
I'm debating which is better: using 2 paralled 50A contacts or
using 2 SPNC relays.

--
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

 

[Carl Ijames]

"David Lesher" wrote in message newspgouj$7jn$1@reader2.panix.com...
240 VAC resistive; we are interupting both sides of a 240V circuit.

I'm having such a hard time finding DPNC 100A contactors that
I'm debating which is better: using 2 paralled 50A contacts or
using 2 SPNC relays.
========================================

No luck finding anything rated higher than 50A, sorry. Would dropping the
DIN rail mount get you anywhere? As far as two 100A relays or parallel 50A
relays, my amateur opinion would be to use two 100A relays. With parallel
relay contacts you have to worry about getting equal current sharing over
the life of the relay in your apparatus, and I think that that is hard to
guarantee.

--
Regards,
Carl Ijames

 

[David Lesher]

"Carl Ijames" <carl.ijamesXXX@YYYverizon.net> writes:

No luck finding anything rated higher than 50A, sorry. Would dropping the
DIN rail mount get you anywhere?

Not as far as I can tell...

As far as two 100A relays or parallel 50A relays, my amateur
opinion would be to use two 100A relays. With parallel relay
contacts you have to worry about getting equal current sharing
over the life of the relay in your apparatus, and I think that
that is hard to guarantee.

Yes, pondered that. But just finding 100A NC relays much less
2-pole ones, is like making cold fusion work.
--
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

 

In sci.electronics.components David Lesher <wb8foz@panix.com> wrote:
> Any suggested PN's & sources?

All of the below are "bare" contactors, not in an enclosure. They
also aren't usually DIN mount - most of them have a mounting flange
or feet at the bottom.

Square D 8502SEO2V01S is 3 pole, 600 VAC / 90 A contacts, 24 VAC coil.
A bargain at around $1,400 list price. Full specs at the hideous URL:

http://www.schneider-electric.us/en/product/8502SEO2V01S/contactor-600vac-90amp-nema-%2Boptions/?range=1450-type-s-contactors&node=166388148-full-voltage-contactors&parent-subcategory-id=50420&parent-category-id=50400

Graybar says they can order it for $1,500 (!) and MSC says they'll order
it for $1,340. This place says $600 but it's not in stock:
https://www.imc-direct.com/product_p/8502seo2v01s.htm

GE's website is crappy enough that it's easier to download their PDF
catalog from
https://www.geindustrial.com/catalog/controlcatalog/01_CC.pdf
and start looking on page 193. From that, you can build part numbers:

CR305M024 2 pole, 600 V / 90 A contacts, 24 VAC coil, list $552
CR305N024 2 pole, 600 V / 135 A contacts, 24 VAC coil, list $1,332
CR305E024 3 pole, 600 V / 90 A contacts, 24 VAC coil, list $600
CR305F024 3 pole, 600 V / 135 A contacts, 24 VAC coil, list $1,440

However, Google can't find any hits for any of those part numbers, so
it may not be possible to actually buy them.

Allen-Bradley/Rockwell also makes contactors like this. A 300-DODJ930
is almost what you want - 3 pole, 90 A - except it has a 24 VDC coil
(24 VAC seems to not be available). It appears to list around $1,160
and a few places say they'll order it for you at that price. These
guys say they can get it in a couple of weeks for $630:

http://mostelectric.com/products/2052157/300-dodj930-allen-bradley-300dodj930-new

ABB also makes these contactors. I didn't look at their catalog, but
came at it through a vendor. ABB A75N3-30-11-84 is 3 pole, 90 A, but
120 V AC coil. Platt Electric stocks it at $400.

https://www.platt.com/platt-electric-supply/NEMA-IEC-Contactors-Non-Reversing-Contactors/ABB/A75N3-30-11-84/product.aspx?zpid=445321

Kilovac makes some AC-rated contactors; their FM200 series is in the
direction of what you want. An FM200BBXX (2 pole) or FM200BBXXX (3
pole) is exactly what you want, but nobody seems to stock them. Mouser
has two FM200CBXXX (3 pole, 120 VAC coil) in stock, for $1,030.

They also make some relays for electric vehicle use that have *DC*
contact ratings. I'm not sure what their position is on using the
contacts on AC; I looked for a tech note but I couldn't find one. They
also have DC coils, so you'd need to add a rectifier. Mouser carries a
LEV100A5ANG for $95 (single-pole, so you'd have to use two) or a
EV202ASAND for $484 (DPST, only need one). If you don't mind buying
surplus, All Electronics has a single-pole one for $39 (!):

https://www.allelectronics.com/item/sol-205/24-vdc-500-amp-900-volt-contactor/1.html

For the Square D, GE, Allen-Bradley, and ABB stuff, I sort of suspect
that if you walk into the electric supply and they've never seen you
before, you pay list price, but if you're their buddy, or they think you
might place a big order in the future, it gets a lot cheaper. (This
pricing model has been obsolete since the day before Christmas 1990,
but it's taking a long time to finally die.)

This may not be what you want, but there is a thing called a "shunt
trip breaker". This is a circuit breaker that opens on overload like
normal, but it also has a solenoid coil in it that you can use to trip
the breaker whenever you want. Once you've tripped the breaker, though,
you have to walk over to the breaker panel and manually turn it back on,
which may not be what you want. Also, you usually have to get it from
whoever built your circuit breaker panel.

(I have seen one used to implement remote emergency stops in a machine
shop. The big machines had shunt trip breakers, and a 24 VAC circuit
ran around the shop to pushbuttons. You could push any of those buttons
and it would open the breakers for the big stuff.)

I am not affiliated with any companies mentioned.

Matt Roberds

 

[David Lesher]

mroberds@att.net writes:

In sci.electronics.components David Lesher <wb8foz@panix.com> wrote:
Any suggested PN's & sources?

All of the below are "bare" contactors, not in an enclosure. They
also aren't usually DIN mount - most of them have a mounting flange
or feet at the bottom.

Thanks, I'm looking at all of these. But thus far, they all are Form A (NO)
contacts. I need Form B (NC) or obviously Form C (DT). I'll look at each
you suggested to see if they come either way.

This may not be what you want, but there is a thing called a "shunt
trip breaker".

Know those well, but they don't suit our needs....

--
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

 

David Lesher <wb8foz@panix.com> wrote:

Thanks, I'm looking at all of these. But thus far, they all are Form A
(NO) contacts. I need Form B (NC) or obviously Form C (DT).

I missed that in your original post. (It's slightly annoying that
industrial electrics have different words for SPST, NO/NC, etc than the
rest of the world.) I think some of those I linked had SPDT versions.

How about buying a big NO contactor and "inverting" the control signal
to it with a little ice cube relay? Maybe your safety case requires
that the big contactor fail closed, though.

Matt Roberds

 

[David Lesher]

mroberds@att.net writes:

I missed that in your original post. (It's slightly annoying that
industrial electrics have different words for SPST, NO/NC, etc than the
rest of the world.) I think some of those I linked had SPDT versions.

Agreed.
I'll look again for such....

How about buying a big NO contactor and "inverting" the control signal
to it with a little ice cube relay? Maybe your safety case requires
that the big contactor fail closed, though.

You have already nailed why we want NC/B.



--
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433