The connector SEW21 can be used with arc protection horn for arc protection for covered conductors. The connector has a place for an Al-thread, so it also works as an arc protection device. The length of 25 mm² Al thread is 2.1 m. The connector can be used as a temporary earthing connector with an arc protection horn suitable for use with temporary earthing devices with screw fixing. The connector is watertight by silicone greased teeth.