We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Small black rectangular battery disconnect switch with red rotary knob and glow-in-the-dark label

Battery Doctor

Battery Doctor PT-WIR20387 gps accessory

SKU CH-1DX9-BQ36N MPN PT-WIR20387

A mini master disconnect switch for single-battery systems up to 48V, rated 300A continuous and 1,000A peak with ISO 8846 approval

  • Product typeGPS Navigation Accessories
  • Key features? For applications up to 48 V;? ISO 8846 approved;? Rated 30
  • Prevents battery drain and theft on stored vehicles with 2-position on/off knob
  • ISO 8846 approved for ignition-protected safety in marine and RV environments
  • Handles 300A continuous and 1000A peak loads via 10mm threaded studs
  • Glow-in-the-dark label enables quick location in low-light conditions
  • Recess or flush mount with removable back plate simplifies installation in tight spaces

Battery disconnect switch for stored vehicles

The Battery Doctor PT-WIR20387 is a single-battery master disconnect switch rated for systems up to 48V. It isolates the battery with a two-position on/off knob to prevent drain, tampering or unauthorized use while a vehicle, RV or seasonal equipment sits in storage. The switch carries ISO 8846 approval and RoHS compliance for marine and automotive safety.

Upgrade from a loose terminal or no isolation

Replacing a simple cable pull or absent switch with this unit adds a positive mechanical break that handles 300A continuous and 1,000A peak current. The jump is worth it when the load regularly approaches the 700A crank rating or when a glow-in-the-dark label and lockable knob are needed for quick identification in low light. It is not for installations that require dual-battery switching or more than two positions.

Sustained load behaviour with removable access

Under continuous 300A flow the 10mm threaded studs and bottom cover maintain a secure connection without hot-spots developing at the terminals. Four removable access panels and cable knockout plates on every side allow heat to dissipate and wiring to be inspected without removing the switch from its recess or flush mount. The housing measures 2.75 inches wide and deep to fit standard panel cut-outs.

How it compares

Measured against everything we stock in GPS Mounts & Accessories, at today’s prices. Recalculated every night.

Price $19.99
Pricier than about 63% of the 716 comparable items (median $14.99).

Specifications

Product
Brand nameBATTERY DOCTOR
Product typeGPS Navigation Accessories
Size & build
Shipping weight0.95 kg
Package size182 × 117 × 86 mm

Questions about this item

What panel depth and cut-out size does the 2.75-inch square Mini Master Disconnect Switch need for a flush top mount?

The switch body measures 2.75 inches wide by 2.75 inches deep by 3 inches high; allow that full footprint plus clearance for the four removable side access panels and the cable knockout plates on every side.

Which step do installers most often miss when wiring the 10 mm threaded studs on this single-battery, two-position switch?

After routing cables through the knockout plates, tighten the supplied nuts on the 10 mm studs to the specified torque and verify the glow-in-the-dark label aligns with the ON/OFF positions before snapping the bottom cover back on.

How can I tell when the ISO 8846-approved contacts inside this 300 A continuous-rated switch need replacement?

Inspect the 10 mm studs and contact surfaces during seasonal maintenance; replace the unit if you see pitting, discolouration from the 1,000 A peak surges, or if the glow-in-the-dark label no longer illuminates after charging in light.

More in GPS Mounts & Accessories

Similar items