Blue Sea Systems AC A-Series 2-Pole Circuit Breaker Lockout Slide

Overview

The Blue Sea Systems A-Series Circuit Breaker Lockout Slide is a panel accessory for managing multiple AC power sources through double pole circuit breakers. It allows only one double pole AC breaker to be switched on at a time, which helps keep shore power, generator power, and inverter power from being connected together on the same AC panel.

This lockout slide fits World or A-Series and Rocker double pole circuit breakers. It uses the existing circuit breaker mounting screw holes, so it can be added without special panel modification. For boats with more than one AC source, it gives the panel a simple mechanical interlock that is easy to see and use during source changes.

Key features

• Mechanical lockout for AC source selection on marine electrical panels.
• Allows only one double pole AC circuit breaker to be activated at a time.
• Helps prevent AC power from shore power, genset, or inverter sources from being mixed.
• Fits World or A-Series and Rocker double pole circuit breakers.
• Installs through the circuit breaker mounting screw holes with no special panel modification.
• Available in 2-position and 3-position configurations for different AC source layouts.

Variants

This product is offered in two configurations based on the number of lockout positions needed on the AC panel.

The main difference is the number of selectable positions. Both variants are used with double pole AC circuit breakers and share the same practical purpose: keeping only one AC source active through the breaker group at a time.

• 4125: Positions 2. This version suits a two-source AC setup, such as shore power and a genset or inverter, where the panel needs a clear mechanical lockout between two double pole breakers.
• 4126: Positions 3. This version suits a three-source AC setup, such as shore power, genset, and inverter, where the source selector area needs one additional lockout position.

Installation and fit

The slide mounts at the breaker location using the existing circuit breaker mounting screw holes. That makes it useful for refits, panel upgrades, or replacement work where the goal is to add source lockout control without cutting or reworking the panel face.

Before installation, confirm the breaker style and the number of AC sources on the vessel. This accessory is intended for World or A-Series and Rocker double pole circuit breakers, so it should be matched to the breaker layout before the panel is assembled or modified.

Use cases on board

This lockout slide is a good match for boats with more than one AC input path, especially cruising boats and fishing boats that switch between dockside shore power, a generator, or an inverter. It adds a physical layer of control at the breaker panel, which is helpful when different operators may use the boat or when source changes happen often.

What’s included

• Lockout slide
• Mounting screws

Shipping
We ship worldwide from the United States. Rates are calculated at checkout based on destination and package weight. Some items include free shipping, which will show automatically. Not every product is eligible for international shipping; checkout will confirm eligibility. We do not ship to PO Boxes except through USPS, and not all packages qualify.

Processing and dispatch
Most orders are verified, packed, and handed to the carrier within 1 to 2 business days. Some products may need extra handling time or ship directly from the manufacturer. For certain international orders, inventory transfers between warehouses may add time. If any delay is expected, we will let you know the dispatch date.

Delivery and tracking
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Duties, taxes, and support
International customers are responsible for any customs duties, taxes, and fees charged by the destination country. If these charges are refused and a shipment returns to us, the carrier’s return cost and any re-entry customs fees will be deducted from the refund. If your order is late or you need help, contact cs@qualityboatparts.com and we will assist you.

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Warranty terms, coverage, and duration are set by each manufacturer. Issues involving defects, repairs, or replacements must be addressed with the manufacturer’s support team. When available, the warranty period is listed on the product page. If it is not shown, contact us or the manufacturer for details before purchasing.

To start a claim, the customer must contact the manufacturer and follow their process. Keep your proof of purchase and original packaging, and register the product if the manufacturer requires it, as these are often needed for warranty service.

We are happy to help you find the right contact or documentation, but we cannot decide outcomes or intervene in claim resolutions. For guidance, email cs@qualityboatparts.com.