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What is this safety switch called?

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Forum topic by cessna310 posted 09-20-2017 06:05 AM 1456 views 0 times favorited 13 replies Add to Favorites Watch
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cessna310

2 posts in 1777 days


09-20-2017 06:05 AM

Is there a switch that can be used on a cabinet saw that will turn off in event of a power outage and will not allow the saw to restart upon power restoration until the saws power switch is physically turned on. In other words the saw won’t accidentally start when the shops power is restored.

Larry


13 replies so far

View MrUnix's profile

MrUnix

5801 posts in 1979 days


#1 posted 09-20-2017 06:08 AM

Mag(netic) switch… starter (NEMA or IEC)... LVC (low voltage control)... take your pick.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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Carloz

758 posts in 372 days


#2 posted 09-20-2017 11:33 AM

How many power outages you have? Unless you are a production shop just turn the switch off after that once in lifetime event when the power outage happens just when you cut wood.

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Carloz

758 posts in 372 days


#3 posted 09-20-2017 11:35 AM



Mag(netic) switch… starter (NEMA or IEC)... LVC (low voltage control)... take your pick.

Cheers,
Brad

- MrUnix


You’d better skip the parenthesis as magswitch is a very useful but completely different switch.

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Sparks500

70 posts in 111 days


#4 posted 09-20-2017 11:59 AM

https://woodworker.com/1hp-5-8amp-1ph-220v-magnetic-switch-mssu-923-950.asp

-- Rockhound: You realize we're sitting on 45,000 pounds of fuel, one nuclear warhead and a thing that has 270,000 moving parts built by the lowest bidder? Makes you feel good doesn't it?

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08k8

11 posts in 30 days


#5 posted 09-20-2017 01:22 PM

My Jet cabinet saw has a “magenetic” switch. It is basically a relay that turns the motor on. The on button that you push sends electricity to the relay coil. The Off button is normally closed and breaks the coil circuit when you press it. If you lose power, you would need to re-initiate that sequence.

-- Too many hobbies.

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Nubsnstubs

1180 posts in 1510 days


#6 posted 09-20-2017 05:06 PM



How many power outages you have? Unless you are a production shop just turn the switch off after that once in lifetime event when the power outage happens just when you cut wood.

- Carloz

That’s easy to say, Carlos, but real life is a lot different that kicking back and making the statement you just made. One power outage is one too many. The magnetic switch prevents one from getting hurt by being distracted by said power outage trying to find out why there is no power. You don’t need the power failure to come from the source, the power company. A worn out outlet that the plug goes into without any effort could allow the plug to fall out, causing a failure. Even someone hooking a foot on a cord lying on the floor causes a power failure. Even on a construction site, someone could disconnect your power and cause you not to turn off the switch because you need to find why you lost power. All the above are distractions that can cause a person to lose focus. There are probably a whole bunch more instances that I didn’t mention, but these I’ve experienced….... Jerry (in Tucson)

-- Jerry (in Tucson) www.woodturnerstools.com

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MrUnix

5801 posts in 1979 days


#7 posted 09-20-2017 06:04 PM

You’d better skip the parenthesis as magswitch is a very useful but completely different switch.
- Carloz

“Magswitch” is a company that sells magnets, not switches. “Mag Switch” is an often used shorthand spelling for “Magnetic Switch”, hence the parens.

How many power outages you have? Unless you are a production shop just turn the switch off after that once in lifetime event when the power outage happens just when you cut wood.
- Carloz

Besides the points Jerry makes, a true magnetic switch (aka: starter) has other benefits as well… such as the ability to run a remote (or multiple) kill switch easily using low voltage instead of line voltage. It also allows the use of larger motors and their increased current demands. Most ‘toggle’ switches can’t easily handle a 3hp or greater motor without arcing and tearing up the smaller contacts than what is found on a properly sized contactor. That is what they were designed for. The power-out safety feature is just an extra benefit due to the design.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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papadan

3584 posts in 3149 days


#8 posted 09-20-2017 06:20 PM



My Jet cabinet saw has a “magenetic” switch. It is basically a relay that turns the motor on. The on button that you push sends electricity to the relay coil. The Off button is normally closed and breaks the coil circuit when you press it. If you lose power, you would need to re-initiate that sequence.

- 08k8


Exactly!

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runswithscissors

2514 posts in 1805 days


#9 posted 09-21-2017 01:18 AM

Grizzly has magnetic switches. Cost around $80 or so. Jerry in Tucson lists several very valid reasons to have one.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

View woodbutcherbynight's profile

woodbutcherbynight

3452 posts in 2189 days


#10 posted 09-21-2017 01:56 AM

Try this one, I have two I installed both on Delta contractors saws. Works well and is cheaper now then when I got them awhile back.

LINK

-- Live to tell the stories, they sound better that way.

View MrUnix's profile

MrUnix

5801 posts in 1979 days


#11 posted 09-21-2017 02:00 AM

Try this one, I have two I installed both on Delta contractors saws. Works well and is cheaper now then when I got them awhile back.
LINK
- woodbutcherbynight

Keep in mind that the switch above provides no overload protection… it would be fine for a motor that has built in protection, but most cabinet saw motors rely on external protection provided by the starter. Just saying.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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woodbutcherbynight

3452 posts in 2189 days


#12 posted 09-21-2017 03:11 AM

Oops missed he was talking about a cabinet saw.

-- Live to tell the stories, they sound better that way.

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cessna310

2 posts in 1777 days


#13 posted 09-22-2017 08:50 PM

A big thanks to all respondents, I now have my answer.

Larry

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