Celduc SMQR900200R Solid Start Relay

The Celduc SMQR900200R Solid Start Relay is a four-channel solid-state relay module that packs four independent AC outputs into a compact 45 mm-wide “sightpac” housing, driven from a single 10–30 VDC control input. Each channel is rated for 25 A, with a maximum switching voltage up to 560 VAC (the SMQR family supports 24–600 VAC), making it suitable for resistive loads like heaters, transformers, or other high-inrush appliances. The unit provides a green LED indicator for each input to show channel status and includes TVS diode protection on the control gates to help withstand voltage transients. Suitable for panel mounting, the SMQR900200R can be configured with either push-in spring terminals or Faston quick-connect terminals, depending on the wiring method you prefer. The four outputs are designed for zero-cross switching, which minimizes noise and inrush on resistive loads, and each output is independently controlled, enabling compact, multi-circuit control in a single enclosure, reducing panel space and wiring complexity.