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Semiconductor Relays


For PCB mounting and switch cabinet

CODICO's products in this segment encompass 1-3 phase solid state relays for PCB or DIN rail mounting, including both AC and DC versions. Potential uses include: in heating control systems, motor applications (soft start/stop modules), rotation reversal and power control applications, and for the control of industrial system components, such as magnet valves, pumps, transformers and interface relays for contactor control, etc.
CELDUC is a leading manufacturer of solid state relays, motor control modules and reed contacts and sensors. The products are developed and manufactured in France; and they conform to all relevant European standards and meet the requirements of numerous different applications in a variety of industries. Thanks to CELDUC's ongoing development effort, new and innovative solutions are introduced regularly! CELDUC solid state relays and products feature modern and highly functional housings, together with the latest solid state technologies, to ensure highest quality and functionality. There are even SSR solutions available which integrate a patented diagnostic system requiring no external voltage! 

In the sensor technology segment, CODICO offers CELDUC float switches including versions for explosive environments (ATEX 94/9/CE), proximity switches/Hall sensors, category 1-4 safety switches and reed switches and magnets.

CELDUC also offers custom solutions to meet your individual requirements!
Application Areas:

  • AC51: Resistive loads (e.g., heaters)
  • AC53: Start and control of asynchronous motors
  • AC54: Reversing asynchronous motors
  • AC55: Filament lamps, infrared emitters
  • AC56: Transformers

Our suppliers in this category Semiconductor Relays:


CELDUC is a leading specialized manufacturer of semiconductor relays and magnetic sensors. The basic product range comprises 1- to 3-phase solid state relays, motor reversal protection modules and motor soft-start modules.


Your contact :

Bild von Arnold Geitzenauer
Arnold Geitzenauer
Sales Engineer, Product Line Manager
+43 1 86305-124

General information on solid state relays / notes and tips:

Specially designed solid state relays for PCB mounting are partially pin-compatible with electromagnetic relays. As a result, they can often serve as no-fuss replacements in existing designs, thus letting users quickly benefit from the advantages that solid state relays offer. Slim-line versions are also available to help save even more board space.

Solid state relays (or SSRs) are not actually relays in the traditional sense, even if they are generally categorized as such. Instead, SSRs are electronic components made with transistors, thyristors or triacs. Because they operate without moving parts, solid state relays offer a long operating life. In addition, they are suited for high switching cycles and adverse environments (such as those containing explosive gas mixtures). Solid state relays are capable of switching AC voltages at the zero crossing point, thus enabling the avoidance of noise impulses. They also support the integration of optocouplers on the IC to achieve galvanic separation. Compared to mechanical relays, SSRs experience higher losses in the load current path and must therefore often be mounted on a heat sink. So-called OptoMOS (or PhotoMOS) relays are special SSR variants whose design is similar to an optocoupler. On the control side, these relays operate like an optocoupler with an IR LED.

At the same time, they are not equipped with triacs or thyristors on the load side – as the previously described SSRs are – but instead with MOSFETs that allow them to switch DC and AC voltages with a (typically) rather low current. PhotoMOS relays do not require cooling, and they characteristically experience a lower voltage drop at low load currents than other types of solid state relays. However, they do typically have a higher “contact resistance” than mechanical relays. PhotoMOS relays also operate without bounce or wear and at high switching speeds (several milliseconds), while special versions are able to achieve switching frequencies of up to 100kHz. In a PhotoMOS relay, the light emitted by an LED generates a voltage in a solar cell, which in turn saturates the gate of a bi-directional MOSFET. This enables the on-off switching of an AC voltage circuit connected between the two drain terminals or of two DC circuits, one each connected between the source terminal and the two drain terminals. The resulting advantages: reliable, wear-free and noise-free switching of both AC and DC loads.

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