In modern electrical systems, relay devices are fairly crucial. This electrical device can control high-voltage and high-current circuits by means of low-voltage and low-current signals. First, if we are to understand the working principle and application scenarios of relay devices, we have to completely understand their internal components. The main components of the relay device are as follows and their purposes:
Coil and iron core make up relay's electromagnetic mechanism. A magnetic field is formed around the coil when the current flows through it. The iron core strengthens the magnetic field and improves electromagnetic system efficiency. When the coil is energised, the iron core magnetises, attracting the armature action to control the relay on-off.
The contact system is an executive part of relay device to realize circuit on-off function. It usually consists of a moving contact and a static contact.Whereas the moving contact connects with the armature, the stationary contact rests on the base of the relay. When the electromagnetic system turns on, the armature attracts; the moving and still contacts shut and the circuit turns on. Turning off the electromagnetic system breaks the circuit, reset the armature, disconnects the moving and still contacts. A relay's performance and lifetime rely on its contact material and design; usually metal with high electrical conductivity and wear resistance.
Fast after a power loss, the reaction system resets the relay device. There is dynamic equilibrium created by the elastic force of the spring and the magnetic force of the electromagnetic system. The armature moves when the electromagnetic system runs since the magnetic force overcomes the elastic force of the spring. When the electromagnetic system is turned off, the elastic spring pulls the armature back to its natural position and reestabs the contact. Relay sensitivity and reliability depend on reaction system performance.
The houses of relay devices protect and insulate them from the outside. It maintains the internal components of the relay and filters moisture, dust, and other contaminants out of it. Furthermore, the housing gives able insulating to guarantee relay safety in high-voltage conditions. Usually insulating is plastic or ceramic housing.
The relay device could have fixings, wiring connections, and other auxiliary components unified. Setting screws fastens the relay device in place during operation; terminals link external circuits for in line current transfer.
Relay device components taken together control and protect. Relay makers know to encounter that relay performance depends on component performance and quality. We closely supervise material selection, the production procedure, and quality inspection to make sure our relay devices satisfy consumer expectations and provide reliable control and protection solutions for many electrical systems.
