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Thermal-magnetic circuit breakers are essential safety devices designed to protect electrical circuits from overcurrents and short circuits. Selecting the appropriate breaker ensures reliable operation and prevents potential damage to equipment and wiring, safeguarding your home or facility.
POWER PROTECTION - This thermal magnetic circuit breaker provides protection for residential and commercial electrical systems. ABB's 20A single-pole breaker protects again electrical faults to enhance safety.
DURABLE AND RELIABLE - The breaker case is heat-resistant for structural integrity, and there are corrosion-resistant connection terminals. They are designed for longevity and meet industry standards.
EASY INSTALLATION - Featuring a straightforward design, this breaker allows for quick and hassle-free installations. This plug-on breaker has a secure connection due to a calibration screw which is cemented to prevent shifting.
APPLICATIONS AND COMPATABILITY - This breaker is ideal for residential and commercial use, and will work with any GE or ABB load center.
FUNCTIONS: Used to protect 48~500VDC OR 90~480VAC circuit from overload and short circuit damage and 12~48VDC from overload damage, and can also be used for control and isolation. Size: 54MM x 80MM x 75MM, Fit for 35mm DIN rail.
DC Circuit Breaker Switch has built-in arc squelching magnet which enables the high arc extinguisher,flame-retardant enclosure, silver alloy contacts, and sufficient pure copper coils to ensure its high quality.
Come with 1 x DIN rail, 2 x screws for easy mounting and 4 x copper crimp terminal for wiring to make sure that the wires are tightly connected.
This Solar Disconnect Switch is suitable for photovoltaic solar panel array,Solar Charge Controller,Batteries,Power inverter,DC motor protect and also suitable for ac systems, RV, home circuits, or other 50/60Hz AC systems.
POWER PROTECTION - This tandem thermal magnetic circuit breaker provides protection for residential and commercial electrical systems. ABB's 20A/1P, 20A/1P double-pole breaker protects again electrical faults to enhance safety.
DURABLE AND RELIABLE - The breaker case is heat-resistant for structural integrity, and there are corrosion-resistant connection terminals. They are designed for longevity and meet industry standards.
EASY INSTALLATION - Featuring a straightforward design, this breaker allows for quick and hassle-free installations. This plug-on breaker has a secure connection due to a calibration screw which is cemented to prevent shifting.
APPLICATIONS AND COMPATABILITY - This breaker is ideal for residential and commercial use, and will work with any GE or ABB load center.
Last update on 2026-10-16 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Thermal-Magnetic Circuit Breakers
Amperage Rating
The amperage rating, measured in amperes (A), indicates the maximum current the breaker can safely handle before tripping. It's crucial to match this rating to the circuit's load capacity to prevent nuisance tripping or inadequate protection. Consult your electrical panel or device specifications for the correct amperage.
Number of Poles
Circuit breakers come in single-pole, double-pole, and triple-pole configurations. Single-pole breakers protect one 120-volt circuit, typically for lighting and outlets. Double-pole breakers are used for 240-volt appliances like water heaters or central air conditioners, interrupting both hot wires simultaneously. Triple-pole breakers are generally for three-phase power applications.
Trip Curve Type
Thermal-magnetic breakers have different trip curve types (e.g., Type B, C, D) that define how quickly they react to overcurrents. Type B breakers trip at 3-5 times the rated current and are suitable for resistive loads like lighting. Type C breakers trip at 5-10 times the rated current, offering better protection for inductive loads such as motors. Type D breakers trip at 10-20 times the rated current, ideal for high inrush current applications.
Frequently Asked Questions
What is the difference between a thermal and magnetic trip?
A thermal trip uses a bimetallic strip that heats up and bends when excess current flows, causing the breaker to trip. A magnetic trip uses an electromagnet that activates instantly during a sudden, high surge of current, such as a short circuit.
How do I know which amperage rating I need?
You should determine the total expected current draw of the circuit. This information is often found on the appliance or device, or it can be calculated based on wire gauge and voltage. Consulting an electrician is recommended if you are unsure.
Can I replace a breaker with a higher amperage rating?
No, you should never replace a circuit breaker with one of a higher amperage rating than the original. Doing so can overload the wiring, potentially causing a fire, as the wire gauge is designed for the original breaker's capacity.
What does 'UL Listed' mean for a circuit breaker?
'UL Listed' signifies that the product has been tested and meets the safety standards set by Underwriters Laboratories. This certification is important for ensuring the breaker has undergone rigorous evaluation for safety and performance.
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