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  • KnobCalm battery disconnect switch
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  • KnobCalm 3-position switch (1 / 2 / Off)
  • KnobCalm 2-position On/Off switch
 Rated 4.8 Excellent - Trusted By 17,000+

KnobCalm ™

$139.99
$139.99
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check_circle Stop the draw your factory switch lets through

check_circle Cut power cleanly without touching cables

check_circle Turn it by hand, no wrench needed

check_circle Leave it parked without the idle drain

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  • Mount it recessed or on a surface using the 4 bolts.
  • Connect your main battery cable to the two studs.
  • Fit the rear cover to insulate the terminals.
  • Turn the red knob to OFF to cut the feed, ON to restore power.

  • 1 rotary battery disconnect switch
  • 4 stainless bolts with nylon lock nuts
  • Removable rear cover plate
  • 4 side hole caps

Once your item/s is dispatched,
the estimated delivery time is:

- USA: 2-9 business days
- UK: 5-13 business days
- Australia: 5-13 business days
- Canada: 2-12 business days
- Europe: 5-13 business days

You have 90 days to return your product for a full refund (return shipping is covered by the customer; defective items ship a free replacement).

✓ Official Authorized Retailer

This product is not available on Amazon or eBay. You are purchasing directly from the only authorized seller — which means full warranty, verified authenticity, and dedicated customer support. Beware of counterfeit listings on third-party marketplaces.

KnobCalm battery disconnect switch

KnobCalm

 4.8/5
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  • Over 17,000 recommend KnobCalm

Built to Hold Your Power Until You Need It

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Terminals covered when you close up

A removable rear cover insulates the terminals against short circuit. Four side hole caps come with it.

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A housing that holds up where it sits

The flame-retardant DMC housing carries an IP55 protection rating. Mount it recessed or on a surface.

KnobCalm
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Built for thousands of turns

Use it season after season. It is rated for 10,000 mechanical and 10,000 electrical cycles.

cable

Hook up your main cable in minutes

Two tin-plated copper studs, 10 mm (3/8 in), sit 30 mm (1.2 in) apart for your main battery cable.

Frequently Asked Questions

verified +347 experts reviewed it as the best choice in 2026
Q1 Will it stop my battery drain in storage?
Wired into the main battery cable, OFF cuts the battery feed, so idle drain stops. Any wiring that bypasses the switch can still draw, so connect everything on the system side of it.
Q2 Is it waterproof enough for my boat?
The flame-retardant DMC housing carries an IP55 protection rating, built for the RV, trailer and boat use this switch is made for.
Q3 Will turning it off reset my radio or clock?
It can. OFF removes battery power from the whole system, so clocks and radio presets that rely on the battery for memory may need re-entering after you turn it back ON.
Q4 Can it handle my load, and my 24V or 48V system?
It is rated 275A DC continuous, for 12-48V DC systems; keep your everyday load below it. Check your biggest sustained load against that number before you order.
Q5 What hardware comes with it, and what lugs fit?
You get 4 stainless bolts with nylon lock nuts, a removable rear cover and 4 side hole caps. The studs are 10 mm (0.39 in), the 3/8 in size, so pick cable lugs with a matching hole.
Q6 Can I lock it together with other switches?
Yes. This switch can be used on its own or locked together with other switches, whichever suits the way your electrical system is set up.
Q7 Who is this switch for?
Owners of an RV, trailer, car or boat that sits idle. It isolates the electrical system and cuts battery drain while the vehicle or boat is not in use.
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