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Sockets for relays

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Sockets for relays

Sockets for relays are elements that enable their installation in modular housings on rails intended for TH35 modular apparatus or on printed circuit boards. Both semiconductor and electromagnetic relays are usually in the form of a cubic device, which cannot be mounted on a rail or on a board without an intermediate element.

Installation of relays in sockets - easy replacement of the apparatus and standardization of solutions

Historically, due to the growing popularity of modular equipment, relay manufacturers, e.g. the Finder known for the high quality of their devices, have offered installers and users a simple solution for non-modular electrical and electronic devices - TH35 rail mounting sockets. A similar genesis was the creation of sockets for the installation of relays on printed circuit boards. In this case, the sockets not only facilitate the work of electronics, but also accelerate the process of assembly of control devices or actuators, which they are part of.

Mounting the relays on mounting rails

The installation of relays in the sockets is usually carried out with the use of latches or clamps - the connection must be strong enough that the relay is fixed in the socket in a stable manner, even in the event of shocks or vibrations. It is especially important in an industrial environment. On the other hand, assembly should be easy and not require the use of tools, which speeds up the work of sewing the wardrobe.

It should also be trouble-free mounting the relays on mounting rails or boards - here the system is usually the same as in the case of other modular devices or devices designed for printed circuits. Another important issue is the wiring - sockets are manufactured with screw or spring terminals - sometimes manufacturers offer a selection within the same product, but this is not a rule.

Easy replacement of damaged elements

Relay sockets have a double function. On the one hand, they are an intermediary element, thanks to which the entire set (relay with socket) can be easily installed on a TH rail or PCB or soldered to printed circuits, and on the other hand, they facilitate the replacement of the relay, if necessary.

Thanks to the system of latches or open and closed clamps, or other similar solutions offered by manufacturers, it is possible easy to replace damaged elements, i.e. failed relays. The simplicity of disassembly and assembly is also helpful if the installer modernizes the control or electrical cabinet and replaces the existing relay with a device with different parameters. In such a case it is important to keep the compatibility of the relay with the socket. Usually, manufacturers such as Finder produce a specific type of socket, which can work with several relays of a given type, differing from each other, e.g. only in load capacity.

Accessories for mounting sockets

Installation of relays in dedicated sockets has one more advantage - it allows the sockets to take over some of the functions that in the case of other solutions must be implemented separately. For example, overvoltage or signaling modules can be plugged into the sockets.

Signaling modules inform about the correct operation of the device or an alarming situation, which is defined contractually for a given solution. These elements are equipped with an indicator diode and are usually produced in two variants - with a green and red diode. In turn, the protectors prevent the destruction of relays - they limit overvoltage on DC coils, but also protect against electromagnetic interference.

Among the accessories for mounting sockets there are also comb connectors and clamps for mounting relays in sockets. These elements are delicate and small, therefore they are easy to damage, and without them the correct location of the relay in the socket is impossible. For this reason, manufacturers who implement solutions with clamps usually offer them for sale not only complete with the socket, but also separately as spare parts.