With this relay, you get a 500A capacity extra size really shows in everyday use.
MATRIX, RMS, Used / 6RX11-3 / Trip Relay Coil & Supervision, 3 C/O Contacts
If you look at the relay, the RS-1M-SH label shows the exact model you’re getting for easy matching.
With 2pcs - 4pin relays, you can wire a small control circuit and still have a spare on hand.