The Omron G3NA420BUTUAC100240 is a single-phase solid-state relay from the G3NA series, rated for 20 A continuous output current with or without a heat sink — the same 20 A limit applies in both cases, so the buyer does not need to derate for an un-heatsunk installation. Output voltage range is 200 to 480 VAC, making it suitable for 230 V, 400 V, or 480 V line supplies common in industrial control panels. Input control is 100 to 120 VAC, which means it can be driven directly from a standard 120 VAC control transformer without an intermediate DC supply. The photocoupler isolation provides galvanic separation between control and load circuits, which simplifies panel wiring and meets basic safety isolation requirements. The finger-safe design means the live terminals are shielded to IP20 touch protection, which reduces shock risk during panel access.
Deployment context
Surface-mounted via screw terminals, the relay is intended for panel or chassis installation — not DIN-rail snap-on. The 1.1 × 1.69 × 2.28 inch footprint (–) fits standard enclosure backplates. A separate heat sink is not included; for loads near 20 A in a warm enclosure, an external heat sink should be added to keep the junction temperature within the -22 to 176 °F operating range (–).