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Celduc relais · Power it
Solid state relays for heaters and high-cycle loads
An electric heater on temperature control switches every few seconds, all shift, for years. A contactor in that spot is a wear item. A Celduc solid state relay switches at the zero crossing with nothing to wear out, and the diagnostic versions tell the PLC the moment a heating element goes open.
Celduc has designed and built relays in Sorbiers, France since 1964. Dynamic is the Celduc rep for Northern California and Northern Nevada, sizing relays and heatsinks against the real cabinet for machine builders.
See the relay familiesSend us the heater schedule
4 A to 125 ASingle, two and three-phase SSRs up to 690 VAC, panel mount or DIN rail.
Over a million a yearDesigned and built in France, on automated wire-bonding lines.
Diagnostics built inLoad lost, mains lost or output shorted, reported in under 100 ms.
Heatsink already sizedReady-to-use DIN rail versions carry the heatsink matched to the rating.
What Celduc makes
Six families, from the 45 mm relay to the sensor
01
okpac single and two-phase SSRs
The 45 mm workhorse for resistive heaters, 12 to 125 A up to 690 VAC, with captive screws or push-in spring terminals.
- SO9 zero-cross relays for AC-51 heating loads
- SOB two-phase: a three-phase heater with about a third less heat than three poles
- IP20 covers between the terminals and the hand
02
Power SSRs with heater diagnostics
Patented SOD and SILD relays, 35 to 125 A, that report a dead element before the zone drifts.
- Load open, mains lost and output shorted on an NC contact
- No auxiliary supply needed
- SILD adds an integrated heatsink
03
cel3pac and sightpac three-phase SSRs
Three-phase relays to 3 x 85 A and 660 VAC for heater banks and small motors.
- Screw or push-in power terminals to 50 mm²
- Pluggable control connector
- sightpac: three poles in the 45 mm footprint
04
celpac 2G DIN rail SSRs
22.5 mm wide on 35 mm DIN rail, up to 75 A, built for crowded panels and multi-zone heater banks.
- SUL and SAL carry their own heatsink
- Wide AC or DC control range
- SU accepts the ESUC diagnostic and ECOM controller plug-ins
05
Proportional power and motor control
For heaters that need more than on and off, and for inductive loads.
- SVTA and SGTA: 0-10 V or 4-20 mA in, phase-angle or burst-fire out, 50 A
- Solid state contactors and soft starters
- Reversing modules to 7.5 kW with no mechanical interlock
06
Magnetic sensors and reed relays
Where Celduc started: sensing with no moving contact to wear.
- Level, flow and position sensors
- Coded-magnet safety sensors
- Reed relays in DIP, SIP and high-voltage packages
Also from Celduc: DC solid state relays for 24 and 48 V heater rails and higher-voltage DC systems, interface relays and custom builds. See the Celduc unique products page.
The engineering behind it
Why a Celduc relay keeps cyclingZero-cross switchingSwitches at the voltage zero for low conducted noise on resistive loads.
Wire-bonded power stageCopper bonded to alumina, multiple bond wires, automated lines.
Push-in or screw terminalsSpring terminals on okpac and cel3pac for faster wiring with no screw to retorque.
AC-51 and AC-53Heater and motor load categories across the range.
Shock and vibrationThe SU and SA celpac ranges meet EN 61373.
On the networkECOM adds current monitoring, a thermocouple input and RS485 to a celpac.
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