They are devices intended to limit the current of a circuit and even
interrupt it in case of short circuits or long-term overloads.
Constitution of NH Security
The NH security guards are composed of base and fuse. The base is constituted
generally of soapstone, plastic or thermocouple, having fastening means to
pictures or plaques. They have contacts in the form of silver claws, which
guarantee perfect electrical contact and high durability. These talons
attach springs that increase contact pressure
The fuse has a rectangular section porcelain body,
mechanical resistance, containing silver knives at the ends. Inside
porcelain body housing the fusible link and the indicator of firing, immersed
in special sand, of suitable granulation.
The fusible link is made of copper, in the form of blades,
points to reduce the conduction section. There are also fusible links made of
the safety fuse, a visible separation of the terminals is obtained, making it necessary in some cases to use an additional disconnector. In order to remove the fuse, it is necessary to use a device, made of insulation fiber, with extraction couplings. This device is called a "fuse".
