This Siemens 3RV1923-4BA00-0FJ0 is an insulating front plate with an IP55 ingress rating and a lockable REDARY mechanism, designed for SIRIUS 3RV circuit breakers in frame sizes S0, S2, and S3.
What the IP55 rating means on the panel
IP55 means the front plate is dust-protected and can handle water jets from any direction — suited for washdown zones in food processing or outdoor cabinets where hose-down cleaning is routine. The lockable REDARY mechanism lets you secure the breaker handle in the OFF position with a padlock, meeting lockout/tagout (LOTO) requirements without needing a separate lockout hasp. It fits the standard cutout for S0, S2, and S3 frame sizes, so one plate covers multiple breaker ratings in the same panel layout.