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Celduc: Solid State Relays Built for Heaters and High-Cycle Loads
Zero-cross SSRs that switch an electric heating element every few seconds for years, diagnostics that tell the PLC when an element has gone open, and DIN-rail versions with the heatsink already sized. Celduc relais has designed and built its own relays in Sorbiers, France since 1964, more than a million a year. Dynamic represents the line across Northern California and Northern Nevada with local sizing, thermal and application support for machine builders.
Why DYNAMIC carries Celduc
A relay is one of the cheapest parts in a heater circuit and the one that decides whether the machine ships with a diagnostics story or a service call. Celduc has made nothing but relays since 1964, designed and built in Sorbiers, France, on automated wire-bonding lines rather than hand-placed copper bridges. We carry it because it is the SSR we can put in a machine builder’s design and stand behind: sized against the real cabinet, checked against the duty cycle, and backed by test data rather than a brochure. Sizing, thermal and approvals questions get answered before the panel is built, not after the first field call.
okpac® Single- and Two-Phase SSRs
The 45 mm hockey-puck workhorse. SO9 zero-cross relays for AC-51 resistive loads, 12 A to 125 A, up to 690 VAC, IP20 covers, captive screws or push-in spring terminals (SOBR). Two-phase SOB versions switch a three-phase heater with about a third less dissipation than a three-pole relay.
Power SSRs with Heater Diagnostics
Patented SOD and SILD relays, 35 A to 125 A, that detect load open, mains lost and output shorted, and report on an NC contact and LED with no auxiliary supply. SILD adds an integrated heatsink. ESUC monitors up to five heaters on one celpac; ECOM plugs a thermocouple controller, current monitor and RS485 onto it.
cel3pac® and sightpac® Three-Phase SSRs
SGT 2G and SGB 2G three-phase relays to 3x85 A and 660 VAC, with screw or push-in spring power terminals to 50 mm² and a pluggable control connector. SMT sightpac puts three poles in the 45 mm footprint, with or without heatsink, for compact heater banks and small motors.
celpac® 2G DIN-Rail SSRs with Built-In Heatsink
22.5 mm wide on a standard 35 mm DIN rail, up to 75 A, wide AC or DC control range and TMS² construction. SUL and SAL “ready to use” versions carry their own heatsink so the thermal calculation is already done; SU versions accept the ESUC diagnostic and ECOM controller plug-ins. The answer for crowded panels and multi-zone heater banks.
Proportional Power and Motor Control
SVTA and SGTA analog-input SSRs take 0-10 V or 4-20 mA and deliver phase-angle or burst-fire power control at 50 A for heaters that need more than on/off. For inductive loads: SO8 heavy-duty relays with varistor protection, solid state contactors, soft starters and electronic reversing modules to 7.5 kW with no mechanical interlock to wear.
Magnetic Sensors and Reed Relays
The product line Celduc started with in 1965. Level and flow sensors, coded-magnet safety sensors to the Machinery Directive, ATEX, PCB, screw-in and tubular position sensors, and reed relays in DIP, SIP and high-voltage packages. They ride along on most Celduc orders, and we stock and support them the same way.
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