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Thermal circuit breakers are essential safety devices designed to protect electrical circuits from overcurrents and short circuits. They automatically interrupt the flow of electricity when excessive heat is detected, preventing potential damage to equipment and reducing fire hazards. Choosing the right thermal breaker ensures reliable protection tailored to your specific electrical system's needs.
Compact, single pole, push-to-reset thermal circuit breakers
Manual Reset 125-250V AC 50V DC Push Button Switch Thermal Circuit Breaker
Operating Temperature: -10oC (14oF) to 60oC (140oF); Interrupt Capacity:1,000 Amps
When the load exceeds rated current, this switch reset button will automatically cut off the circuit, and thus play a role in protecting the line.
Widely used in household and commercial appliances, small power generators, air compressors, cars, electric vehicles, power tools,extension cords, industrial, transportation, marine, telecommunications, power strips, audio-visual, medical, and power...
Product Name: Compact, Single Pole, Push-to-Reset Thermal Circuit Breakers
Operating Voltage: 125/250V AC 32V DC; power rating: 3A,5A,10A,15A,20A (amp)
Working Principle:This switch can be reset after a disconnect over a period of time, then you can press the reset switch to use it again When load exceeds rated current, the switch reset button will automatically cut off the circuit,protecting the line
Application Field:Widely used in household and commercial appliances, transportation, marine, telecommunications, power strips, audio-visual, medical, and power supplies
Protect Your System: Nilight thermal circuit breaker can be reset after a disconnect over a period of time, then you can press the reset switch to use it again When load exceeds rated current, the switch reset button will automatically cut off the...
Compact Design: Push-to-reset operation with black manual reset button. This circuit breaker with a waterproof button cap to protect from moisture, water, or bad weather. The hole size for mounting is in 3/8 inch(10mm).This circuit breaker can be used for...
High Quality: Our Thermal Circuit Breaker is made of premium bakelite, durable and reliable to use, heat resistant, melting resistance and good conductivity, waterproof cover protect the internal from water and further damage.
Application: Our circuit breaker compatible with all 12/24V vehicle and 125-250V AC systems industries. Widely used in household and commercial appliances, transportation, marine, telecommunications, power strips, audio-visual, medical, and power supplies
Package Includes: 1 x 5A Manual Reset Thermal Circuit Breaker, 1 x 10A Manual Reset Thermal Circuit Breaker, 1 x 15A Manual Reset Thermal Circuit Breaker, 1 x 20A Manual Reset Thermal Circuit Breaker, 1 x 25A Manual Reset Thermal Circuit Breaker, 5 x Hex...
Product Name: Manual Reset 125-250V AC 50V DC Push Button Switch Thermal Circuit Breaker
Operating Voltage: 125/250V AC 50V DC; power rating: 25A (amp);Operating Temperature: -10oC (14oF) to 60oC (140oF) Interrupt Capacity:1,000 Amps
Working Principle: This switch can be reset after a disconnect over a period of time, then you can press the reset switch to use it again When load exceeds rated current, the switch reset button will automatically cut off the circuit, protecting the line
Application Field:Widely used in household and commercial appliances, transportation, marine, telecommunications, power strips, audio-visual, medical, and power supplies
DROP‑IN REPLACEMENT FOR 185‑SERIES BREAKERS: Simplifies upgrades and repairs by matching existing mounting patterns for quick installation
VISIBLE RESET LEVER: Allows you to instantly confirm breaker status, improving safety and troubleshooting efficiency on board
IGNITION‑PROTECTED DESIGN: Safe for use in gasoline‑powered boats, meeting SAE J1171 external ignition protection requirements for added peace of mind
WEATHER‑RESISTANT HOUSING: Ensures reliable performance in harsh marine environments, protecting your electrical system from moisture and corrosion
SWITCH + CIRCUIT BREAKER COMBINATION: Reduces component count by combining switching and overcurrent protection into one unit, saving space and simplifying wiring
Protect Your System: Nilight thermal circuit breaker can be reset after a disconnect over a period of time, then you can press the reset switch to use it again When load exceeds rated current, the switch reset button will automatically cut off the...
Compact Design: Push-to-reset operation with black manual reset button. This circuit breaker with a waterproof button cap to protect from moisture, water, or bad weather. The hole size for mounting is in 3/8 inch(10mm).This circuit breaker can be used for...
High Quality: Our Thermal Circuit Breaker is made of premium bakelite, durable and reliable to use, heat resistant, melting resistance and good conductivity, waterproof cover protect the internal from water and further damage.
Application: Our circuit breaker compatible with all 12/24V vehicle and 125-250V AC systems industries. Widely used in household and commercial appliances, transportation, marine, telecommunications, power strips, audio-visual, medical, and power supplies
Package Includes: 5 x 15A Manual Reset Thermal Circuit Breaker, 5 x Hex Nut, 5 x Waterproof Button Caps.
Made of premium plastic. The reset switch is designed to protect the circuit and automatically cut off the circuit when the load exceeds the rated current, thus prolonging the service life
Application: automobile, ship, industry and other industries
Packing: 1× overload protector 1× waterproof button cap
1, What You Get ------ In this kit, You will get 30Pcs 5 Sizes Thermal Circuit Breaker Assortment Kit, Including 5Amp: 2Pcs; 10Amp: 2Pcs; 15Amp: 2Pcs; 20Amp: 2Pcs; 30Amp: 2Pcs and 20Pcs Quick Connect Terminals and Waterproof Button Caps, Compact design...
2, Compact Design ------ Push-to-reset operation with black manual reset button.this circuit breaker with a waterproof button cap to protect from bad weather. The mounts in 3/8 inch(10m m) round hole.This is fit for one push button circuit breaker for...
3, With Quick Connect Terminals and Waterproof Button Caps ------ Includes waterproof button cover for protection from the elements. Not designed for push on / push off manual switch operation, but the button pops out at overload and is reset by pushing...
4, Wide Applications ------ Great for For Automotive / Industrial / Marine And Many Other applications. Needed these to fix an electric tricycle and had trouble finidn them until helped You‘ fit a newer nomenclaturee. Fixed Your issue of Various life...
5, Warm Note ------- We wants you to be absolutely happy with our products. For better shopping experience, if you have any questions, please feel free to contact us.
Last update on 2026-07-18 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Thermal Circuit Breakers
Understanding Amperage Rating
The amperage rating of a thermal circuit breaker indicates the maximum amount of current it can safely handle before tripping. It's crucial to match this rating to the circuit's expected load and the wire gauge being used. Selecting a breaker with a rating too low will cause nuisance tripping, while one with too high a rating will not provide adequate protection.
Type of Reset Mechanism
Thermal circuit breakers come with different reset mechanisms. Manual reset breakers require a person to physically flip the switch back on after a trip. Automatic reset breakers will attempt to reset themselves once the fault condition is cleared, which can be useful in remote or inaccessible locations. Consider the convenience and safety implications of each type for your application.
Environmental Considerations
The environment where the breaker will be installed is a key factor. Some breakers are designed for harsh conditions, featuring water resistance, dust protection, or resistance to vibration. Ensure the breaker's enclosure and materials are suitable for the ambient temperature, humidity, and potential exposure to corrosive elements to guarantee its longevity and performance.
Frequently Asked Questions
What is the difference between a thermal and a magnetic circuit breaker?
Thermal circuit breakers use a bimetallic strip that bends when heated by overcurrent, causing the breaker to trip. Magnetic circuit breakers use an electromagnet that activates and trips the breaker instantly during a sudden surge or short circuit. Many breakers combine both thermal and magnetic tripping mechanisms for comprehensive protection.
How do I determine the correct amperage rating for my circuit breaker?
The amperage rating should be based on the continuous load of the circuit and the capacity of the wiring. Consult electrical codes and guidelines, or a qualified electrician, to ensure the breaker rating is appropriate for your specific application and wiring size. It should be rated to handle the anticipated load without tripping but low enough to protect the wiring.
Can a thermal circuit breaker be used as a general-purpose switch?
While a circuit breaker can be manually switched on and off, it is primarily designed as a safety device. Repeatedly using it as a regular switch can wear out its internal components and compromise its ability to protect the circuit effectively. It should only be switched off for maintenance or in response to a fault condition.
What does it mean if a circuit breaker trips frequently?
Frequent tripping usually indicates an overloaded circuit or a short circuit. An overloaded circuit means too many appliances are drawing power simultaneously. A short circuit involves a direct connection between positive and negative wires, causing a massive surge of current. In either case, it's important to identify and address the root cause.
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