Siemens RV421G Three Phase Overload Protection Relay

Siemens RV421G is a 30 A, 240 V fusible bus plug in the XL-X Series, configured as a four-pole (4P) device for Siemens/ITE bus duct installations. It functions as a plug-in protection element within an XL-X busway run, integrating a fuse in-line with the supply to protect adjacent equipment. The RV421G is marketed as a direct replacement for the ITE RV421G devices, ensuring compatibility with legacy RV-series bus plugs. Verified listings from distributors describe the unit as a 30 A, 240 V fusible bus plug in the XL-X family, and they note the 4P configuration. Availability from multiple suppliers confirms continued support and supply for Siemens/ITE bus duct systems.