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How to wire water heater safety switch

control water heater with switch
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240V water heater can be controlled directly with a 30-amp double-pole switch

Rated 25 amp
Turn off both Hot wires.
Not necessary, since turning off 1 hot wire works fine. Read above
Use diagram that comes with device... my illustration shows house wires connected to bottom two screws, and load wires connected to top two screws... house wires can be connected top two scres, the result is same unless specified by product label.
A double pole switch will act as a 'power cut off switch' or 'safety switch' as required by some local codes.

Buy double pole 30 amp switches:
Leviton 3032-2w double pole 30 amp at Amazon
Leviton MS302-DS 30 amp double-pole switch at Amazon
2-pole 30 amp non-fusible safety switch/ power cut-off
30 amp switches at Amazon
Twisting wires
wire connector basics

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30 amp switches 30 amp double-pole 30 amp DPDT Ordinary 15-20 amp switches 15 amp pilot light
Cooper 30 Amp switch
Single-pole/ 2-pole on-off switches
30 amp 2-pole switch
30 amp industrial grade

Heavy duty double-pole switches to turn off both hot wires in 240 volt circuit
30 amp motor switch
40 amp motor switch
Double pole double throw 30 amp switch
30 amp DPDT switch

Use this switch to toggle water heater between 120-240 volt
single-pole switch
Ordinary 15-20 amp toggle switch
15 amp switch
20 amp switch

Indicator light shows when Load is ON
Pilot light switch
How to wire pilot light switch
30 amp safety cut off

30-Amp 120-240-volt Two-Pole Indoor Safety Switch with Neutral/ fusible

2-pole 30 amp non-fusible safety switch/ indoor / power cut-off
2 pole 60 amp non-fusible / outdoor box/ at Amazon
Safety switches at Amazon
Safety switches for power tools

How to wire safety switch

You can use fusible or non-fusible
Having more than one fuse on same line is ok by code
How to wire safety switch
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