RBL Waterproof Circular Connectors Amphenol LTW RBL Connectors are IP67-rated waterproof circular connectors with current ratings of 5A, 10A, or 20A. These Amphenol LTW waterproof connectors offer an operating temperature range from -40°C to +105°C and 250 cycles durability. RBL Connectors provide maximum contact resistance of 10mΩ and minimum insulation resistance of 100MΩ at 500VDC.