The glass charging station of the DiamondClean 9000 is specially designed for this model and similar Philips Sonicare products. It is not clear whether it also supports other models such as the Philips Sonicare ProtectiveClean 5100. The glass charging base is usually optimised for the DiamondClean series and compatibility with other models may vary. It would be advisable to consult the official Philips documentation or customer service to ensure that the charging station is compatible with other models.