The D130 Auxiliary Relay Module can be used with all Bosch Security Systems control panels. The relay module consists of a 12 VDC or 24 VDC relay. This device allows the system to handle larger amounts of current or different voltages that are beyond the control panel's auxiliary power rating, or the rating of modules such as the D8129 OctoRelay.The relay is polarized and has two sets of non-latching Form C contacts. When the contacts are in the inactive state, the normally-closed terminal has continuity with the common terminal. When the contacts are in the active state, the normally-open terminal has continuity with the common terminal. The relay is activated by switching polarity. A red LED lights to indicate the coil is energized