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

CELDUC is a leading specialized manufacturer of semiconductor relays and magnetic sensors, with its own production facilities in France and worldwide operations!


The basic product range comprises 1- to 3-phase solid state relays, motor reversal protection modules and motor soft-start modules. Models rated for a current of 1A to 125A and line voltage of up to 690Veff are available. The range of DC solid state relays extends to versions rated for up to 150A and 600VDC.


Solidstate Relays

1- and 3-phase solid state relays for DIN rail and PCB mounting. CELDUC applies DCB technology to meet highest quality requirements!

CELDUC solid state relays are fitted with direct copper bonding (DCB) substrates. The use of DCB technology in combination with wire-bonded power semiconductors enables the products to be 100% machine manufactured, thus ensuring a continuously excellent level of quality. A further advantage of DCB technology is that it reduces thermal resistance between the solid state switching elements and the heat sink.

The obvious benefit to users is that generated heat, which is a factor especially during peak situations like a short circuit or high switch-on currents, is more effectively dissipated. Initial experience shows that DCB technology can deliver up to three times longer operating life compared to conventional solutions – which themselves already provide high operating times.


Solid State Relays for PCB Mounting and Switch Cabinets

Our 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, we offer 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


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.


Reed Relays  CODICO offers signal and high-voltage reed relays!

CODICO offers a broad range of reed relays and contacts. In addition, we are pleased to provide custom designs and selections, even complete sensor units with pre-assembled cables if so desired! Reed relays are extremely reliable and ideally suited for especially low switching loads, regardless whether a high or low switching rate is used (even as low as once every 10 years). And, compared to similarly dimensioned conventional electromagnetic relays, reed relays can be designed for very high switching voltages (up to 10kV). They are also available in DIL and SMD packages, two commonly used formats for PCB mounting in the microelectronics industry.


 General technical information on reed relays:

Even today, reed relays – so named because the contacts are in the form of metal reeds – still occupy a significant role in the field of relay technology. Thanks in particular to polarized relay technology, reed relays have enjoyed an impressive development history. The first changeover reed relays had a closed glass tube with one non-magnetic and two ferromagnetic reed contacts fused in inside. Excitation of the coil caused the two ferromagnetic contacts to close. However, the discharge of silicate vapor from the glass during the fusing-in process proved to be disadvantageous for contact resistance. Modern reed relays have since been fitted with additional design functionality to improve contact strength. Today’s relays are filled with an inert gas and come embedded in a synthetic resin. In addition, the reed contacts are bifurcated to create a reliable double-make contact. The permanent magnet is arranged such that its flux is superimposed on the flux of the excitation coil.

Thanks to their construction, reed relay contacts are protected from corrosion and oxygen. Not only does this make them extremely reliable, but they are also especially well suited for use with low switching power – regardless whether the relays are activated frequently or very rarely (e.g., only once every 10 years).


Unlike conventional electromagnetic relays with similar dimensions, reed relays can be designed for very high switching voltages (up to 10kV) by increasing the interior pressure of the filling gas. Reed relays are also available in DIL and SMD packages, two commonly used formats for PCB mounting within the microelectronics industry.


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