MRJR Ruggedized RJ Receptacle Connectors Amphenol MRJR Ruggedized RJ Receptacle Connectors feature die-cast housings and IP67 sealing for Harsh environment applications. These connectors provide reliable performance in extreme conditions for demanding applications and mate with standard RJ plugs where Ethernet/IP protocol is used. The MRJR connectors protect against shock, vibration, and impact preventing distortion. A wide variety of mounting and termination options are available operating in a temperature range of -55°C to +105°C.