YZQPNB Battery Disconnect Switch Negative Cut-Off with Lockout Plate — 12–36V, 500A, Waterproof

YZQPNB Battery Disconnect Switch with Lockout Plate is a heavy-duty negative battery cut-off that isolates 12V–36V electrical systems with a simple turn and optional lock to prevent accidental reconnection.

This compact rotary battery isolator combines robust electrical capacity with a sealed, water-resistant housing and a lockout bracket for safe maintenance and anti-theft protection. Designed for automotive, marine, RV and industrial use, it provides a straightforward way to cut power, prevent parasitic drain, and secure battery circuits when vehicles or equipment are stored, serviced, or transported.

How does the switch stop battery drain or prevent accidental starts?

Turning the knob mechanically disconnects the negative battery terminal, interrupting current flow to accessories and starter circuits. When the knob is locked in the off position on the mounting panel, it prevents unauthorized or accidental reconnection.

• Interrupts circuit at negative terminal to halt parasitic draw
• Lockable knob secures the off position for storage or transport
• Two 10 mm threaded studs with nuts make secure cable attachment simple
• Works across common system voltages (12V, 24V, 36V)

What electrical capacity and materials does it use?

The unit is rated for continuous currents up to 500A with instantaneous surge handling up to 5000A, covering demanding starter and accessory loads. Internals use silver-plated copper connections for improved conductivity and lower heat under load.

• Working voltages: 12V, 24V, 36V
• Rated continuous current: 500A; instantaneous: 5000A
• Silver-plated copper for durable, low-resistance contacts
• Sturdy die-cast handle for reliable manual operation

Is this switch suitable for outdoor or marine environments?

Yes—the design includes a sealed, waterproof housing that helps protect the internal contacts from moisture and contaminants. The heavy-duty construction and corrosion-resistant materials make it a good fit for boats, yachts, and exposed vehicle installations.

• Sealed housing reduces water and dust ingress
• Corrosion-resistant plating and hardware for marine use
• Die-cast handle resists mechanical wear in outdoor settings
• Mounting bracket and lockout plate included for secure installation

How do I install and lock the disconnect switch safely?

Mount the switch on a flat panel using the included bracket, attach the negative battery cable to the two 10 mm studs with the supplied nuts, and route wiring to avoid chafing. After confirming correct connections, rotate the knob to the off position and engage the lockout plate to secure it.

• Use included mounting bracket for firm panel attachment
• Tighten cable nuts to ensure good electrical contact
• Confirm polarity and system voltage compatibility before use
• Engage lockout plate to prevent accidental knob operation

Who is this for? Technicians, boat owners, RV enthusiasts, fleet managers and DIY vehicle owners who need a dependable method to isolate a battery for maintenance, storage, or theft prevention will appreciate the YZQPNB Battery Disconnect Switch with Lockout Plate. It suits anyone requiring high-current handling, water resistance, and a simple, lockable manual control for negative-battery isolation across 12V–36V systems.