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Master Disconnect Switch 

75920 

 

300A   12V DC 

250A   24V DC 
200A   36V DC 

 

 
 

 

 
 
 
 
 
 
 

 
 
 

 

 
 
 
 

 
 
 
 
 

 

Mounting pattern 1 is the easiest to achieve, as it does not require a 
panel punch.  For additional mounting assurance, Mounting Pattern 
2 also uses the flats on the mounting shaft to prevent rotation. 

 

 

This product requires

 

the use of the bezel.  It supports the knob 

and guides it during operation to assure long life and smooth 
operation.

 

 

1.  Open the attached hardware bag and check contents versus 

the list on the next page. 

2.  Put one of the 3/4”  hex nuts on the neck and then the 3/4” 

lock washer.  Make sure to run it down far enough to leave 
space the get the neck through the panel. 

3.  Bring the switch in through the back of the panel making sure 

to align the anti-rotation stud. 

4.  Adjust the mounting nut behind the panel until ½ - ¾” of the 

threaded portion of the neck (not including the shaft) extends 
through the panel.  

5.  Holding the switch in place,  place the bezel over the neck and 

align it to the anti-rotation pin.  

6.  Put the second mounting nut on the threaded neck and 

tighten to 216 in-lbs maximum. 

7.  Line up the knob with the flat on the shaft,  and press it in 

place until it bottoms out. 

8.  Check to make sure that the lockout opening on the bezel and 

the lockout opening on the knob line up so that a padlock 
shackle can be placed through both in the off position.  If this 
is out of alignment, remove the knob and adjust the two 
mounting nuts until you can align the bezel and knob. 

9.  Once satisfied with the fit of the knob use the 4-40 pan head 

screw ( 2 in-lbs torque) to lock the handle in place.  Then press 
the plug into the hole with your fingers.   

10.  Remove the nuts and lock washers from the two 3/8” studs.  

 

Ø13

16 [Ø20.6]

0.813 [20.65]

Ø 5

16 [Ø7.9]

Required for Switches 

with Indexing Pin

Ø 5

16 [Ø7.9]

0.670 [17.02]

0.813 [20.65]

Ø13

16 [Ø20.6]

Connection Schematic 

Mounting Pattern 1 

Mounting Pattern 2 

Installation 

Make good contact!  

 

Unlike many other Master Disconnects on the market,   
the 75920 studs are permanently affixed to the base,  
so you can remove all the hardware and use the entire stud.

 

 

1-800-548-1191 - http://www.partdeal.com - info@partdeal.com

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