The Omron G3NA-610B-DC5-24 is a solid state relay from the G3NA series, switching single-phase AC loads up to 400-600 VAC via a 5-24 VDC control input. The photocoupler-isolated zero-crossing output means it switches on near the voltage zero crossing, reducing inrush and EMI on resistive or lightly inductive loads — a clean fit for heater banks or lamp circuits where you want to avoid contactor noise. Rated output current is 10 A with a properly sized heat sink, or 4 A without one. The heat sink is not included, so factor that into the BOM — a standard DIN-rail or panel-mount heat sink rated for at least 10 A continuous at the ambient temperature will get you the full rating. Without a heat sink, the 4 A limit applies; pushing past that risks thermal runaway in the output triac.
For BOM freeze or long-term support, the G3NA series has been stable for years; no PCN-driven replacement is expected near-term.
Surface-mount package with screw terminals — 1.69 in wide, 2.28 in deep, 1.18 in tall. Finger-safe construction means the live terminals are shrouded, which simplifies panel layout for IEC 61439 compliance. The LED indicator on the input side gives a quick visual on coil state during commissioning. Input draws 0.6 to 15 mA from the 5-24 VDC control signal — check your PLC output card's sink capability if driving multiple relays in parallel. The 100 megaohm insulation resistance between input and output holds up well in high-humidity environments.