How Pilz safety relays work

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

PILZ SAFETY RELAYS GENERALLY CONSIST OF AN IRON CORE, COILS, ARMATURES, CONTACT REEDS, ETC. As long as a certain voltage is added to both ends of the coil, a certain current will flow through the coil, resulting in an electromagnetic effect, and the armature will overcome the tensile force of the return spring under the action of electromagnetic force attraction and attract to the core, thereby driving the dynamic contact of the armature to engage with the static contact (normally open contact). When the coil is de-energized, the electromagnetic suction force disappears, and the armature returns to its original position under the reaction force of the spring, so that the moving contact engages with the original static contact (normally closed contact). In this way, it is engaged and released, so as to achieve the purpose of conduction and cutting in the circuit. For the "normally open, normally closed" contacts of relays, they can be distinguished as follows: the static contacts that are in the open state when the relay coil is not energized are called "normally open contacts"; Static contacts that are turned on are called "normally closed contacts".

The working principle and characteristics of thermal reed relays

Thermal reed relay is a new type of thermal switch that uses thermal magnetic materials to detect and control temperature. It is composed of a temperature sensing magnetic ring, a constant magnetic ring, a reed switch, a thermally conductive mounting sheet, a plastic substrate and some other accessories. Thermal reed relays do not use coil excitation, but are driven by the magnetic force generated by the constant magnetic ring. Whether the constant magnetic ring can provide magnetic force to the reed switch is determined by the temperature control characteristics of the thermosensitive magnetic ring.

The working principle and characteristics of Solid State Relays (SSRs).

The solid-state relay is a four-terminal device with two terminals as the input terminal and the other two terminals as the output terminal, and the intermediate isolation device is used to realize the electrical isolation of the input and output.

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