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It sounds like you’re looking into the (rectifier / power system controller) and specifically its password – either because you’ve lost access, or you’re researching default credentials for legitimate testing/configuration.
If you found this as a security finding – yes, default passwords on Smartpack are a in critical infrastructure. eltek smartpack password
Want me to dig into a specific model (e.g., Smartpack S, Smartpack 2, or the older MPX 93/97)? It sounds like you’re looking into the (rectifier