How to Reset Circuit Breakers
Circuit breakers are crucial safety devices used to protect electrical systems from damage due to overcurrent. If you're dealing with a tripped circuit breaker, it's essential to understand the reset method based on breaker type. There are three main types—automatic, modified, and manual—each suited to specific applications.
While their reset methods differ, all types perform the same basic function: interrupting current flow during an overload or short circuit.
Always Fix the Root Cause First
Before resetting any type of circuit breaker, it’s critical to identify and fix the cause of the trip — such as a short circuit or overload. Resetting a breaker without resolving the underlying issue can result in repeated tripping or even damage to the system.
TYPE I – Automatic Reset Circuit Breakers
Type I circuit breakers automatically reset themselves after tripping.
How to reset
- Find and correct the issue (short circuit or overload).
- No manual reset is needed — the breaker will automatically reset once it cools and the fault clears.
Best used in
- Automotive and marine systems where manual access is limited and overloads are infrequent.
Key advantage
- Restores power without user intervention.
- Ideal for users who want continuous operation without having to manually reset the breaker.
TYPE II – Modified Reset Circuit Breakers
Type II circuit breakers reset only after the power to the system is turned off and then back on.
How to reset
- Find and correct the issue causing the trip.
- Turn off the system or ignition.
- Wait a few moments for the breaker to reset internally.
- Turn the system back on.
Best used in
Circuits that require resetting only when the system is powered down, such as in vehicles or equipment where extra control is needed.
Key advantage
- Adds a layer of safety by requiring a power cycle before reset.
- A good option for systems that need protection only when powered on.
TYPE III – Manual Reset Circuit Breakers
Type III circuit breakers require the user to physically reset them after tripping.
How to reset
- Find and correct the issue (such as a short or overload).
- Press the reset button or flip the lever on the breaker.
- Turn the system back on and verify operation.
Best used in
Marine, industrial, and RV applications where visual inspection and manual confirmation are needed before restoring power.
Key advantage
- Prevents automatic resets, allowing time for inspection and repair.
- Ideal for troubleshooting and safely restoring power after addressing the root cause.
Samuel Kenny, Product Manager at OptiFuse, leads the development of advanced circuit protection products for automotive, marine, and industrial sectors. He designs custom solutions and shares expert fuse selection tips on the OptiFuse Blog.