The 3SB3400-1QE is a digital monostable switching component from Siemens. It is designed for use in final control applications, such as time delay and pulse applications. It has multiple triggering modes, such as direct trigger, electro-magnetic triggering, and programmable restart/input. The output is a monostable short pulse, which can be set between 0.1s and 10s, with a maximum of 1.5ms. It is also equipped with a manual reset option, allowing the component to be reset manually after a power failure or other issue. The 3SB3400-1QE is simple to install and comes with built-in protection against over-voltage, spike protection, and reverse polarity.