It’s not a normal mechanical relay. No moving parts inside - uses semiconductors to switch AC power on/off fast.
Specs on the label:
1. MAX 90A: Can switch up to 90 Amps load. That’s heavy duty - can run big heaters, motors, industrial machines
2. AC 24V-380V: Works with 24V AC up to 380V AC. So covers single phase 220V and 3-phase 380V
3. 50HZ-60HZ: Works with Nigeria’s 50Hz and US 60Hz power
4. IN / OUT: Top 2 terminals = Control input. Bottom 2 terminals = Power output/load. Middle terminals look like they’re for the main AC line in/out