This is a type of one-way switch that works on finger proof and tunnel terminals. All the switches are under IP 20 protection to ensure??complete protection from sparks or fire. This category of one-way switches come in a pack of 20 pieces. The loader used in??the making of this switch is made from glass-filled PBT. Hence, it ensures a high melting point and thus completes elimination of any??breakout. Also, the switch caps are made from PC- that is a fire retardant material.