I noticed that the RELAY AND CONTROL brand keeps the markings consistent, which time on troubleshooting.
Macromatic Pmpu 3 Phase Monitor Relay, Spdt, 500Vac, 8 Pin
What stands out about the AMP brand is the way it keeps things straightforward and practical.
What stands out about this unit is the Brown Boveri Electric Inc. branding, and it looks professionally done.