Eltako pulse switch UC. 1 potential-free normally open contact 10A/250V AC, incandescent lamps 2000W. No standby loss. For flush mounting. 45 mm long, 45 mm wide, 18 mm deep. State-of-the-art hybrid technology combines the advantages of wear-free electronic control with the high performance of special relays. Either universal control voltage 8..230V UC at the control input +A1/-A2 or 230V with up to 5 mA glow lamp current at the control input with glow lamp symbol (L)/-A2(N). The simultaneous use of two potentials at the control inputs is not permitted. Very low switching noise. No continuous power supply required, thus no standby loss. By using a bistable relay, there is no coil loss and no heating even in the switched-on state. The relay contact can be 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 additional base load, but the monitoring voltage must be set to maximum. The electronics have no independent 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, activating the microcontroller, allowing it to read the last switching state from its non-volatile memory, switching the bistable relay accordingly in the opposite direction and setting the new switching state.