In control systems applied in modern electromechanics, solutions based on discrete components and digital electronics are becoming increasingly common. In addition to speed and absence of mechanical components, semiconductor alternatives to traditional components have a number of practical advantages – e.g. they are smaller, more durable and silent. These are the main reasons why we are witnessing a shift in the automation segment from traditional electromagnetic relays to modern SSR solutions, i.e. Solid-State Relays. At TME, we’re constantly expanding our offer of these components, which are adapted to various demanding applications.
SSRs by CELDUC
Below, we present products by Celduc, a company who specialises in reed switches, solid-state relays and related accessories. The wide selection of relays is diversified in many respects – not only with respect to their electrical parameters. Let us have a look at all the key features of the products available at TME. At the same time, it is worth emphasising at this point that the manufacturer designs its solutions so that they can successfully replace electromagnetic components controlling both resistive and inductive loads (after applying an external varistor or other protection against transient voltages).
Dimensions & enclosure
A traditional model of an SSR is the so-called hockey puck. It is a rectangular block made of plastic, with mounting holes spaced at 47.6 mm. Mechanical durability and popularity are great advantages of this structure. The leads are attached using flat slip-on connectors or screw terminals. Moreover, in the case of Celduc products, the bottom side of the relay is made of aluminium and, in combination with a suitable heat sink, provides thermoregulation of the component. SSR components can reach their maximum capabilities only when properly cooled (this applies especially to the maximum load current).
DIN rail-mounted SSRs.
Celduc also manufactures a compact variant of these relays, with the same mounting hole spacing and a width of 22.5mm, which translates into a very small footprint. The second type of solid-state relays by Celduc are through-hole mounted (THT) components. They usually feature NO (normally open, equivalent to SPST contacts) output configuration and are contained in a slim enclosure that occupies a relatively small area on a PCB. Also available are models of SSRs suitable for direct DIN rail mounting.
Relay with integrated heat sink.
Due to the high number of possible SSR applications, also as a replacement for electromagnetic components, products by Celduc offer a wide range of available operating parameters. Our catalogue includes components that can be controlled with low voltages, starting from 3V DC, as well as relays that are indispensable in many automation systems and adapted to voltages appearing in power lines, i.e. up to 265V AC. The switching voltage can be as high as 690V AC, as TME offers models that are suitable for 2-phase and 3-phase installations. The maximum current can reach 125A (although for most models it does not exceed 50A, which should satisfy the requirements of most applications).
It is worth noting that SSRs by Celduc tolerate a wide range of ambient temperatures. For many of its products the manufacturer guarantees correct operation in temperatures ranging from -55°C to 100°C. All components of this manufacturer are characterised by a very low leakage current (even ca. 0.1mA) and a switching time of up to 10ms.
Celduc products available at TME include current monitoring modules. Due to the role SSRs play in automation systems (also thanks to their silent operation), it would be reasonable to use accessories that enable monitoring of these components. Furthermore, current monitoring modules protect relays from possible damage – e.g. due to excessive load. Their functions include: detection of no load, power failure, short-circuit; they also trigger an alarm when 86% of the programmed load is exceeded.
Control module equipped with LED indicators.
Text prepared by Transfer Multisort Elektronik Sp. z o.o.
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