ELTAKO pulse switch UC. 1 potential-free normally open contact, 10A/250V AC, incandescent lamps up to 2000W. No standby loss. Designed for installation. Dimensions: 45mm long, 45mm wide, 18mm deep. State-of-the-art hybrid technology combines the advantages of wear-free electronic control with the high performance of special relays. It can be operated with a universal control voltage of 8..230V UC at the control input +A1/-A2 or 230V with up to 5mA glow lamp current at the control input with glow lamp symbol (L)/-A2(N). Simultaneous use of two potentials at the control inputs is not permitted. Very low switching noise. No continuous power supply required, hence no standby loss. The use of a bistable relay ensures that there is no coil loss and no heating even when switched on. The relay contact can be either open or closed at startup and will synchronize on the first operation. If this pulse switch is in a circuit monitored by a field disconnector, it does not require an additional base load, but the monitoring voltage must be set to maximum. The electronics do not have their own power supply and therefore consume no power in either contact position. Only during the short control pulse of just 0.2 seconds does the control current flow, which activates the microcontroller, allowing it to read the last switching state from its non-volatile memory, switch the bistable relay accordingly in the opposite direction, and set the new switching state.