The SI system (current pulse system) is a control and automation technology for hard-wired installations. The wide range of functional modules and the logic provided by the wiring enables a wide range of control tasks to be carried out. These include switching electrical consumers (e.g. lights, roller shutters, blinds) depending on the light and time of day, dimming functions for low-voltage and DALI lights, or protecting roller shutters and awnings from wind and rain. These can be supplemented as required with individual, group and central commands. The SI system does not require any PC programming and can therefore be installed conventionally. Since the wiring largely corresponds to controls with relay or contactor circuits, the costs for planning and commissioning are very low. The consistent use of the control and supply voltage of 24 V DC and the strict separation between the protective extra-low voltage and low-voltage side make the components compact, cost-effective and immune to interference. In addition, control cables with a length of up to 100 m allow standard switch programs to be easily connected, even in large buildings. The system is particularly suitable for lighting control. Remote dimmers, the DALI gateway and twilight sensors are available for this purpose. Impulse switches, also known as remote or pulse switches, switch on with an electrical impulse and off again with another. The devices in the SIR series can be used universally thanks to their 24 V impulse technology. The design is suitable for installation in electrical distribution boards. The bistable load relay SIR 16 L is also suitable for high, inductive loads. With its various inputs, it can be integrated into central on or central off commands or operated as a monostable relay. Properties: low control power, powerful switching contact, small space requirement (1 HP), switching status display via LED, mounting type: quick attachment to mounting rail, areas of application: the relay is generally suitable for switching tasks in the 230 V network, e.g. B. for controlling lights, drives, etc.