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Just don't get electrocuted building a safety system 
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Machine Safety Interlock Wiring in the Home Shop
- Thread starter wcunning
- Start date
Already posted are good suggestions
We have VFD so controls are logic into VFD but controlling a motor or other loads is simple.
First avoid "going cheap", nothing wrong with saving money but given you are asking we are assuming limited skill set.
So forget about locating relays and contractors unless you get lucky like us and get a box full for 2 bucks.
Search for a "magnetic starter" for a motor same size as the one on your machine.
But wait...You need remote control (start and stop buttons) and you need to be able to upgrade to larger motor later.
These devices have current sensing in them and will protect the motor from over current and some are adjustable or have changeable parts for motor current.
Start and stop buttons are common items on ebay.
Your "e-stop" I'll not really be a stop but rather "off" as you likely do not have a motor that can have braking.
The "safety" or "multi - point stop" switches can be placed in many places.
We added a foot bar to ours that allows it to be shot off with tap of foot.
The stop switches are normally closed so all connected in series so any one pressed causes stop.
Someone else stated a shop master.
On our air compressor we were forgetting turn it off.
It is 7.5 hp with mag starter.
We added a toggle switch to the control line so easy to control
Next added a relay with 120 vac coil and placed a standard cord on it.
We added an outlet wired to light switch that compressor control plugs into.
Lights on allows compressor to run.
Same can be done to anything with magnetic control.
Sent from my SAMSUNG-SGH-I337Z using Tapatalk
We have VFD so controls are logic into VFD but controlling a motor or other loads is simple.
First avoid "going cheap", nothing wrong with saving money but given you are asking we are assuming limited skill set.
So forget about locating relays and contractors unless you get lucky like us and get a box full for 2 bucks.
Search for a "magnetic starter" for a motor same size as the one on your machine.
But wait...You need remote control (start and stop buttons) and you need to be able to upgrade to larger motor later.
These devices have current sensing in them and will protect the motor from over current and some are adjustable or have changeable parts for motor current.
Start and stop buttons are common items on ebay.
Your "e-stop" I'll not really be a stop but rather "off" as you likely do not have a motor that can have braking.
The "safety" or "multi - point stop" switches can be placed in many places.
We added a foot bar to ours that allows it to be shot off with tap of foot.
The stop switches are normally closed so all connected in series so any one pressed causes stop.
Someone else stated a shop master.
On our air compressor we were forgetting turn it off.
It is 7.5 hp with mag starter.
We added a toggle switch to the control line so easy to control
Next added a relay with 120 vac coil and placed a standard cord on it.
We added an outlet wired to light switch that compressor control plugs into.
Lights on allows compressor to run.
Same can be done to anything with magnetic control.
Sent from my SAMSUNG-SGH-I337Z using Tapatalk