Blue Sea Systems ATO/ATC-Style Low Profile Circuit Breaker, For ST-Blade Fuse Blocks, 32V DC, Thermal Trip, Manual Reset, 2pk

Overview

The Blue Sea Systems ATO/ATC-Style Low Profile is a manually resettable circuit breaker made to replace standard ATO and ATC blade-style fuses in compatible DC fuse blocks. It gives boat owners a cleaner way to handle branch circuit protection because a tripped circuit can be reset with the push button rather than replacing a fuse after each overload event.

This low-profile breaker is rated for up to 32V DC and uses a thermal trip with manual reset. It has an interrupt capacity of 2000A at 28V DC and operates from -30° C to 77° C, which makes it suitable for common marine DC panels, small electronics circuits, pumps, lighting runs, and accessory loads when the correct amperage is matched to the wire and circuit.

The breaker fits ATO and ATC blade fuse locations and works with Blue Sea Systems ST-Blade fuse blocks, including water-resistant ST-Blade fuse blocks when the cover is secured. It is a practical option for boats where fast serviceability matters, such as fishing consoles, helm panels, cabin accessory circuits, and small DC distribution panels.

Key features

• Drop-in replacement for ATO and ATC blade-style fuses in compatible fuse blocks.
• Manual push-button reset helps restore a protected circuit without carrying spare fuses for that amperage.
• Thermal trip, manual reset breaker type for DC branch circuit protection.
• Maximum voltage rating of 32V DC for common 12V and 24V boat electrical systems.
• Interrupt capacity of 2000A at 28V DC for protection against high fault current within its rating.
• Operating temperature range of -30° C to 77° C for engine-adjacent spaces, helm panels, and cabins exposed to seasonal temperature swings.
• Compatible with Water-Resistant ST-Blade Fuse Blocks when the cover is secured, and compatible with other ST-Blade Fuse Blocks without a cover.
• Available in 5A, 7.5A, 10A, 15A, 20A, 25A, and 30A ratings to match different protected circuits.

Variants

This product range varies by amperage rating, with options from 5A through 30A. The selected amperage should match the protected circuit, wire size, and equipment requirements rather than the accessory alone.

The low-profile ATO/ATC blade format, 32V DC maximum voltage rating, thermal trip with manual reset, 2000A interrupt capacity at 28V DC, and ST-Blade fuse block compatibility remain consistent across the range.

Installation and setup

Install this breaker in the same type of fuse position used for an ATO or ATC blade fuse. The push-button reset should remain accessible after installation, especially in helm and distribution panels where a circuit may need to be checked quickly underway or at the dock.

Before replacing a fuse with a resettable breaker, confirm the circuit amperage, conductor size, and connected load. A resettable breaker should not be used to increase the rating of an existing circuit, and any repeated trip should be treated as a wiring or load issue that needs inspection.

Compatibility and fit

This breaker is a good match for boat owners and technicians who already use ATO/ATC-style DC fuse positions and want reset capability without changing the fuse block layout. It fits Blue Sea Systems ST-Blade fuse blocks and is especially useful in locations where small DC circuits are grouped together, such as electronics panels, switch panels, and accessory distribution blocks.

What’s included

• Two ATO/ATC-style low profile circuit breakers in the selected amperage.

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
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Delivery and tracking
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Duties, taxes, and support
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Quality Boat Parts is a reseller. Many items include a manufacturer’s warranty, and all warranty service is handled directly by the manufacturer. We do not manage or administer warranty claims on behalf of customers.

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.