Protection from direct and indirect lightning impulse and other transient over voltage Max: ... and below, to protect from direct and indirect lightning impulse and other transient over voltage.SPD meets with ... transferring, 11 as middle position, 12 and 11 opened under SPD acting, 14 and 11 closed under SPD acting, 11 and ... signal. Model and Meaning Technical ParameterOutside Size NS6 Lightning Arrester