The "UL 508A" label is on the product models of R-BBU (Battery Backup Unit), MCS (Multiple Control Station) and GVMS (Voice Module). These control panels met the requirements of UL 508A Standard.

UL 508A is the standard for the construction of Industrial Control Panels.  The standard covers industrial control panel assemblies which may contain motor controllers, overload relays, fused disconnects switches, circuit breakers, buttons, switches, timers, controllers, wiring, terminals and enclosure.  UL 508A panels for industrial machinery are rated 600 volts or less, and the ambient temperature at the installation location is 40°C(104°F) or cooler.  For more information, go to www.ul.com.