IEC 60947-1, EN 60947-1 IEC 60947-5-1, EN 60947-5-1. 22 mm Pilot Light Heads, Plastic. Siemens extremely rugged IP69K high-grade plastic pilot lights heads with integrated LED, available in a variety of colours. Self-holding function of the actuator when mounting Twist prevention integrated into patented holder design Stackable contact modules Easy installation Suitable for use in extreme environments No special tools required Simple geometry for mounting holes