What this relay does on the panel
The Omron G7J-2A2B-B-W1-AC200/240 is a bracket-mounted enclosed power relay from the G7J series, with a 200/240V AC coil and a 25 A contact rating — sized to switch motor loads up to 3 hp at 240V AC or 1-1/2 hp at 120V AC, which is the practical ceiling on a relay this size in a control cabinet.
Insulation, endurance, and panel wiring
Dielectric strength is 2,000V AC between same-polarity contacts and 4,000V AC coil-to-contact and across opposite-polarity contacts — enough headroom that the relay sits comfortably on a mixed-voltage panel without a separate isolation barrier. Electrical operating life is rated 100,000 operations and mechanical life 1,000,000 — the mechanical figure is the shelf-life ceiling, and the electrical figure is what governs a contactor used on a frequently-cycled load. Termination is ten screw terminals on a bracket-mount body with a manual push-test button — the push-test lets a wireman exercise the contactor without energising the coil, which speeds up the bench check before the panel is powered up.