Hubbellock heavy duty locking connectors are used in industrial and marine applications to prevent accidental disconnection caused by wire loosening. They feature steel / nylon construction to withstand temperatures ranging from -40 to 75 degrees C. These connectors are integrated with spring loaded safety shutter that automatically ejects the plug to eliminate contact teasing. Choose from a wide range of these connectors, available in 1 & 3 phase configurations on Raptor Supplies.