Peel magnetic relays – the difference between solid state relays and mechanical relays

Create Date: 2024-8-30 12:03:23|Source: PILZ/PILZ

1. The structure/working principle of the two is different

Mechanical relays consist of an iron core, coils, and contacts. When the coil is energized, the current in the coil generates a magnetic field that makes the contacts act, thus completing the working principle of the mechanical relay.

Solid state relays are made up entirely of electronic components. A typical component is an optocoupler. DC loads will use MOS transistors as power switching devices, and AC loads will use thyristors as power switching devices.

2. The contact details of the two are different

The contacts of mechanical relays are mechanical. When a large current is broken, an electric spark is generated, the so-called arc. Arc suppression is an industrial problem. Contacts will corrode if they work in an arc environment for a long time. Shorten the service life, so the mechanical relay will be marked with the service life.

The contacts of solid state relays are electronic, such as MOS transistors or thyristors, and are not affected by arcing, so there is almost no lifetime limit under the premise of reasonable use. However, if the current of the electronic device is too large, it is necessary to connect the heat sink, and the larger the current, the larger the heat sink used.

3. The switching noise is different

Friends who have used mechanical relays know that when the relay moves, it will make a sound of contact action. The larger the contact, the louder the sound, whereas the electronic contacts of the solid state relay operate without sound. Relatively quiet. In addition, mechanical contacts have bouncing/jitter issues during operation, resulting in an unsmooth current waveform during operation, whereas electronic contacts are much better.

In summary, the contacts of the solid state relay are implemented by means of a power switching device. Higher switching frequency, lower noise, and no arc faults. This is the advantage of solid state relays and the disadvantage of mechanical relays.

Mechanical relays have a greater ability to interrupt current and are less expensive than solid state relays. However, the greater the breaking current, the greater the arcing hazard.

Peel magnetic relays – the difference between solid state relays and mechanical relays

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