Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
RFQ CartGet a QuoteSign inSign up
BATTERY DOCTOR Battery Disconnect Switch: Top Post Rotary, Top Post, Negative, 12V, 500 A - Battery Disconnect Switches
BATTERY DOCTORBattery Disconnect Switches

BATTERY DOCTOR Battery Disconnect Switch: Top Post Rotary, Top Post, Negative, 12V, 500 A

The BATTERY DOCTOR Battery Disconnect Switch is a top-post rotary disconnect switch with a negative polarity, rated for 12V and a maximum surge current of 500 A, featuring zinc contacts. This switch is designed for…

SKU 3G-OTH-497584

Brand
BATTERY DOCTOR
Item
Battery Disconnect Switch: Top Post Rotary, Top Post, Negative, 12V, 500 A
Category
Battery Disconnect Switches
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Technical Specifications

BATTERY DOCTOR
Manufacturer Part Number
20309
Type
Top Post, Negative, 12V, 500 A, Zinc
Polarity
Negative
Maximum Voltage
12V
Contact Material
Zinc
Maximum Surge Current
500 A
View Full Spec Sheet

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

BATTERY DOCTOR Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The BATTERY DOCTOR Battery Disconnect Switch is a top-post rotary disconnect switch with a negative polarity, rated for 12V and a maximum surge current of 500 A, featuring zinc contacts. This switch is designed for reliable battery isolation in industrial applications.

Frequently Asked Questions

What is a BATTERY DOCTOR Battery Disconnect Switch used for?

A BATTERY DOCTOR Battery Disconnect Switch isolates the battery from the electrical system, preventing parasitic drain and enabling safe maintenance. It is used in industrial vehicles, equipment, and machinery where reliable battery isolation is required.

What are the specifications of the BATTERY DOCTOR 20309 disconnect switch?

The BATTERY DOCTOR 20309 is a top-post rotary disconnect switch with negative polarity, rated for 12V and a maximum surge current of 500 A. It features zinc contacts and is designed for durable battery isolation in industrial applications.

Where to buy a BATTERY DOCTOR disconnect switch worldwide?

3G Electric supplies the BATTERY DOCTOR disconnect switch worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead time on this and other industrial battery disconnect switches.

How to install a BATTERY DOCTOR top-post disconnect switch?

Disconnect the battery negative terminal first. Mount the switch securely to the battery top post using the provided hardware. Connect the cable to the switch output, then test operation. Always follow manufacturer instructions and safety guidelines for your specific application.

Used in

Common applications for BATTERY DOCTOR
Fleet maintenance — BATTERY DOCTOR 31200 Series circuit breakers for overcurrent protection in truck electrical systems
Automotive wiring harness repair — BATTERY DOCTOR GPT primary wires (20 AWG, 22 AWG) for replacing damaged low-voltage cables
Industrial control panels — BATTERY DOCTOR primary wires for internal wiring of 60 V control circuits
Marine battery systems — BATTERY DOCTOR circuit breakers for protecting DC circuits on boats
Off-road equipment — BATTERY DOCTOR 31200 Series breakers for resettable protection in ATVs and utility vehicles
Battery charger connections — BATTERY DOCTOR primary wires for extending charger leads in workshop environments

BATTERY DOCTOR Products

3G Electric supplies BATTERY DOCTOR battery disconnect switches. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

More from BATTERY DOCTOR

View all BATTERY DOCTOR parts →
BATTERY DOCTOR Battery Disconnect Switch: Side Post Rotary, Side Post, Negative, 12V, 500 A, Zinc (MPN 20310). Key specifications — Polarity: Negative; Maximum Voltage: 12V; Maximum Surge Current: 500 A; Contact Material: Zinc; Brand: BATTERY DOCTOR.
BATTERY DOCTOR
BATTERY DOCTOR Battery Disconnect Switch: Side Post Rotary, Side Post, Negative, 12V, 500 A, Zinc (MPN 20310). Key specifications — Polarity: Negative; Maximum Voltage: 12V; Maximum Surge Current: 500 A; Contact Material: Zinc; Brand: BATTERY DOCTOR.
BATTERY DOCTOR Battery Disconnect Switch: Emergency Cut-Off Switch, In-Line, DC, 12V, 1 Positions (MPN 20340). Key specifications — Polarity: DC; Maximum Voltage: 12V; Contact Material: Brass; Brand: BATTERY DOCTOR.
BATTERY DOCTOR
BATTERY DOCTOR Battery Disconnect Switch: Emergency Cut-Off Switch, In-Line, DC, 12V, 1 Positions (MPN 20340). Key specifications — Polarity: DC; Maximum Voltage: 12V; Contact Material: Brass; Brand: BATTERY DOCTOR.
BATTERY DOCTOR Battery Disconnect Switch: Top Post Knife Blade, Top Post, Negative, 12V (MPN 20148). Key specifications — Polarity: Negative; Maximum Voltage: 12V; Contact Material: Copper; Brand: BATTERY DOCTOR.
BATTERY DOCTOR
BATTERY DOCTOR Battery Disconnect Switch: Top Post Knife Blade, Top Post, Negative, 12V (MPN 20148). Key specifications — Polarity: Negative; Maximum Voltage: 12V; Contact Material: Copper; Brand: BATTERY DOCTOR.
BATTERY DOCTOR Battery Disconnect Switch: Top Post Knife Blade, Top Post, Negative, 12V (MPN 20138). Key specifications — Polarity: Negative; Maximum Voltage: 12V; Contact Material: Copper; Brand: BATTERY DOCTOR.
BATTERY DOCTOR
BATTERY DOCTOR Battery Disconnect Switch: Top Post Knife Blade, Top Post, Negative, 12V (MPN 20138). Key specifications — Polarity: Negative; Maximum Voltage: 12V; Contact Material: Copper; Brand: BATTERY DOCTOR.
BATTERY DOCTOR Master Disconnect Switch: In-Line Rotary, In-Line, Negative, 12V, 500 A Max Current (MPN 20243-7). Key specifications — Polarity: Negative; Maximum Voltage: 12V; Maximum Surge Current: 5,000 A; Contact Material: Silver Plated Copper; Brand: BATTERY DOCTOR.
BATTERY DOCTOR
BATTERY DOCTOR Master Disconnect Switch: In-Line Rotary, In-Line, Negative, 12V, 500 A Max Current (MPN 20243-7). Key specifications — Polarity: Negative; Maximum Voltage: 12V; Maximum Surge Current: 5,000 A; Contact Material: Silver Plated Copper; Brand: BATTERY DOCTOR.
BATTERY DOCTOR Starter Switch: In-Line Push Button, In-Line, Negative, 12V, 20 A Max Current, Copper (MPN 20302). Key specifications — Polarity: Negative; Maximum Voltage: 12V; Contact Material: Copper; Brand: BATTERY DOCTOR.
BATTERY DOCTOR
BATTERY DOCTOR Starter Switch: In-Line Push Button, In-Line, Negative, 12V, 20 A Max Current, Copper (MPN 20302). Key specifications — Polarity: Negative; Maximum Voltage: 12V; Contact Material: Copper; Brand: BATTERY DOCTOR.
BATTERY DOCTOR Battery Disconnect Switch: In-Line Rotary, In-Line, Negative, 12V, 250 A Max Current (MPN 20259). Key specifications — Polarity: Negative; Maximum Voltage: 12V; Maximum Surge Current: 2,500 A; Contact Material: Copper; Brand: BATTERY DOCTOR.
BATTERY DOCTOR
BATTERY DOCTOR Battery Disconnect Switch: In-Line Rotary, In-Line, Negative, 12V, 250 A Max Current (MPN 20259). Key specifications — Polarity: Negative; Maximum Voltage: 12V; Maximum Surge Current: 2,500 A; Contact Material: Copper; Brand: BATTERY DOCTOR.
BATTERY DOCTOR Master Disconnect Switch/Lockout: In-Line Rotary, In-Line, Negative, 12V, 5,000 A (MPN 20247-7). Key specifications — Polarity: Negative; Maximum Voltage: 12V; Maximum Surge Current: 5,000 A; Contact Material: Silver Plated Copper; Brand: BATTERY DOCTOR.
BATTERY DOCTOR
BATTERY DOCTOR Master Disconnect Switch/Lockout: In-Line Rotary, In-Line, Negative, 12V, 5,000 A (MPN 20247-7). Key specifications — Polarity: Negative; Maximum Voltage: 12V; Maximum Surge Current: 5,000 A; Contact Material: Silver Plated Copper; Brand: BATTERY DOCTOR.