This device has a 30mm single-hole mounting with locking nut.
Lamp: max. 2.8W, socket BA 9s (Lamp not supplied with the optional extra)
Attention: Switching with non-pushed button is possible between 9 o'clock position and 12 o'clock position. Switching from 9 to 8 o'clock and 12 to 1 o'clock is possible with pushed button only.

The device can also be supplied with 1 or 2 auxiliary contacts. It is possible to choose between the following contact systems.
With rigid contact bridge for high AC-15 switching ability, which is even available as gold version for aggressive environments.
With gold-plated H-brigde 'cross-wire' contact system for low voltages resp. currents.