25A Thermal Circuit Breaker - Pack of 2

Key Features

• Automatic Overload Protection: Specifically designed to protect electrical circuits and sensitive equipment from damage caused by current overloads. The breaker will "trip" and pop out the button when the current exceeds 25 Amps.
• Dual AC/DC Versatility: Fully rated for both AC (125V/250V) and DC (32V) applications, making it a universal safety component for household appliances, marine vessels, and automotive electrical systems.
• Manual Push-to-Reset: Features a reliable "trip-free" design where the breaker cannot be held "ON" during an ongoing overload. Once the fault is cleared, a simple press of the manual button restores the circuit.
• Waterproof Protective Caps: Includes high-clarity silicone screw-on caps that provide an IP64-rated moisture and dust seal, protecting the reset button and internal mechanism in marine or outdoor environments.
• Quick-Connect Terminals: Equipped with standard 0.250-inch (6.3mm) male spade terminals, allowing for fast, solderless wiring connections using standard female crimp connectors.

Replaces / Cross-Reference Part Numbers

• Industry Standards: Series 58, W58-Type, KUOYUH 88 Series.
• Marine/Automotive Codes: MRCB-25A, 11210-25, 42-25A.
• Manufacturer Equivalents: Joemex PE74, Tyco W58-XB1A4A-25, Potter & Brumfield W58 series.
• Kit Components: Includes 2x 25A Breakers, 2x Waterproof Caps, 2x Mounting Nuts, and 2x Nameplate Screws.

Compatibility & Fitment

This 25-Amp protector is a standard safety component for a wide range of power distribution and appliance applications. Key compatible use cases include:

• Marine & RV: Fits DC fuse panels and switchboards for boats, yachts, motorhomes, and campers (e.g., SeaFlo, Blue Sea Systems style panels).
• Small Appliances: Used in air compressors, pressure washers, floor scrubbers, and high-draw kitchen appliances.
• Power Equipment: Common in portable generators, battery chargers, and power strips to prevent total circuit failure.
• Industrial Tools: Fits many bench grinders, drill presses, and woodworking machinery control boxes.
• Note: This is a Thermal breaker. It is designed to ignore short-duration "startup surges" but will trip during sustained overloads.

When to Replace

• Breaker Won't Reset: The button will not stay pushed in even after the appliance has cooled down and the load is removed, indicating internal mechanical failure.
• Nuisance Tripping: The breaker trips at currents well below 25 Amps, suggesting the internal bimetallic strip has become "weak" or calibrated incorrectly due to age.
• Visible Heat Damage: The black plastic housing is melted, discolored, or charred near the terminals, often caused by loose wiring connections creating localized resistance.
• Corroded Terminals: In marine environments, green or white oxidation on the metal spade lugs can prevent electrical flow or cause the breaker to overheat.
• Loose Reset Button: The button feels "mushy" or fails to provide a distinct clicking sound when reset, indicating a broken internal spring.

Installation Tips

• Safety First: **CRITICAL:** Ensure the power source (Battery or AC Mains) is completely disconnected before installation. Touching live terminals can result in severe shock or short circuits.
• Check Wire Gauge: For a 25-Amp circuit, ensure you are using at least 10 AWG or 12 AWG copper wire. Using thinner wire can cause the wiring to overheat before the breaker has a chance to trip.
• Mounting Hole: This breaker typically requires a 3/8-inch (10mm) round mounting hole. Ensure the panel thickness is within 0.03" to 0.10" for the mounting nut to thread securely.
• Terminal Tension: Ensure your female spade connectors are tight. If they slide on too easily, use pliers to gently crimp the connector for a firm, low-resistance "friction fit."
• Avoid Overtightening: When installing the waterproof cap, tighten it only until the silicone seal is snug against the panel. Overtightening can strip the plastic threads on the breaker body.