Fuse links and fuse holders are integral components of an electrical protection system, designed to work together to ensure the safety and proper functioning of circuits. Here's how they function together:
Fuse Link (Fuse):
A fuse link is a self-acting device that interrupts the circuit by breaking the current when it exceeds a given value for a sufficient time. According to the definition by IEC 60127, a fuse comprises all the parts that form the complete device, which includes the fuse holder and the fuse link itself .
The fuse link contains a fuse element that is designed to melt and break the circuit in case of an overcurrent situation. This action is automatic and serves to protect the circuit from damage due to excessive current .
Fuse Holder:
A fuse holder is a device designed to securely hold the fuse link in place within an electrical system. It provides a means to easily replace the fuse link after it has blown, without the need for extensive disassembly or tools .
The fuse holder also ensures that the electrical connection is maintained when the fuse link is intact. It is designed to withstand the electrical stress and environmental conditions that the fuse link may be subjected to during normal operation and during a fault condition .
Working Together:
The fuse link is inserted into the fuse holder, which is then connected into the electrical circuit. Under normal operating conditions, the fuse link allows current to flow through the circuit unimpeded .
When an overcurrent condition occurs, such as a short circuit or an overload, the fuse link responds by melting its fusible element. This action interrupts the flow of electricity, thereby protecting the circuit from damage .
Once the fuse link has blown, it can be removed from the fuse holder and replaced with a new one. The fuse holder remains in the circuit, providing a ready means to restore protection after the fault has been cleared and the cause of the overcurrent has been addressed .
In summary, the fuse link is the sacrificial element that protects the circuit by breaking the flow of electricity during an overcurrent event, while the fuse holder provides a secure and convenient means to install and replace the fuse link. Together, they form a critical safety mechanism in electrical systems.
