Recovery diode modules + LED are used for DC only. The reverse voltage peaks of the coil are short circuited by the recovery diode (positive to terminal A1). The release time increases by an approximate factor from 3 to 5. If an increase of the release time is undesirable use a Varistor or RC module. The LED indicator lights up when the coil is energized. · · · Green LED + diode module (standard polarity) – ATEX compliant (Ex ec)* · · DC only. · · Reverse voltage peaks short circuited by the recovery diode · · The release time increases by an approximate factor from 3 to 5 · · LED indicator lights up when the coil is energized. · · Plug In for replacement