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Fuse & Circuit Protection

In electronics and electrical engineering, a fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby stopping or interrupting the current. It is a sacrificial device; once a fuse has operated it is an open circuit, and must be replaced or rewired, depending on its type.

A circuit breaker is an electrical safety device designed to protect an electrical circuit from damage caused by an overcurrent or short circuit. Its basic function is to interrupt current flow to protect equipment and to prevent the risk of fire. Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation.

The main difference between fuses and circuit breakers is that circuit breaker functions to mechanically disconnect the connection any time the power load exceeds supply. This helps prevent fires and other problems on connected devices. On the other hand, a fuse prevents a specific device from spoiling in case the current incoming exceeds the required.


Automotive fuses are used to protect the wiring and electrical equipment for vehicles. There are several different types of automotive fuses and their usage is dependent upon the specific application, voltage, and current demands of the electrical circuit. Automotive fuses can be mounted in fuse blocks, inline fuse holders, or fuse clips. Some automotive fuses are occasionally used in non-automotive electrical applications. Most automotive fuses rated at 32 volts are used on circuits rated 24 volts DC and below. Some vehicles use a dual 12/42 V DC electrical system that will require a fuse rated at 58 V DC. Daier produces blade fuses (mini size, ATC fuses, and MAXI size), glass tube or Bosch type fuses  (5X20mm, 6X30mm, and 10X38mm AGU fuses), ceramic fuses (5X20mm and 6X30mm), and ANL fuses.

Fuse Holder

A fuse holder is a block or case into which fuses are inserted, simply to hold the fuse in place to fulfill its function. Fuse Holders have many shapes, colors, and sizes depending on where they need to be installed. What types of fuse holders do you have? Panel mount: The fuse holders are mounted on a panel, the head of the fuse holder is exposed. It’s easy to install or replace the fuse. Base mount: The holder has mounting holes, and install it to the place by screws. PCB Mount: The fuse holder is installed on PCB, usually with a cap. Inline: a housing for a fuse with wire leads, usually for safety or waterproof purposes. The fuse holders we supply can be matched with glass tubes (5X20mm, 6X30mm, and 10X38mm AGU fuse), ceramic fuses (5X20mm and 6X30mm), blade fuses (Mini Size, ATC Fuse, and MAXI Size) and ANL fuse.

Circuit Breaker

Circuit breakers protect the wire in electrical circuits. Daier broad selection of magnetic and thermal circuit breakers include a vast selection of main and branch circuit protection devices. Their robust design makes them ideal for marine and vehicle AC & DC electrical systems. These miniature circuit breakers use a push-button actuator to manually on and off the breaker. These pushbutton circuit breakers interrupt current overloads and mount on the front panel of equipment. They are typically used in simple systems without separate switchboards or enclosures. Such as power supplies, medical equipment, control panels and telecommunications equipment to prevent damage from overcurrent and short circuits.

Overload Protector

Our overload protectors include circuit breaker switches and thermostats. Circuit breaker switch is designed to protect electrical circuit from damage caused by excess current. The circuit breaker switch's basic function is to interrupt current flow after a fault is detected. Our ST-1 and ST-2 series Push Button type circuit breaker switches with M10 Panel Mounting Hole size, The current ranges from 3A to 60A. Waterproof rubber caps are available for them. Our ST-001 series Rocker type circuit breaker switch is widely used on power extension sockets, it can not only control the socket ON/OFF like a rocker switch, but also protect the circuit. This switch can be Short Terminals or Long Terminals, with LED illuminated or Non-illuminated. Thermostat is designed to protect electrical circuit from damage caused by excess temperature. There is a bimetal disc inside the thermostat,The bimetal disc will snap action under the change of sensing temperature. The snap action of disc can push the action of the contacts through the inside structure, and then caused the circuit ON/OFF finally. Circuit breaker switches and TLRS-9700(KSD9700) Thermostats are Manual Reset type. KSD301 thermostats can be Manual Reset or Auto Reset.

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