3RW4026-1BB14 (SIEMENS)

The 3RW4026-1BB14 is a Soft Starter characterized by its small space requirements. Integrated bypass contacts mean that no power loss has to be taken into the bargain at the power semiconductors (thyristors) after the motor has started up. This cuts down on heat losses, enabling a more compact design and making external bypass circuits superfluous. At the same time this soft starter comes with additional integrated functions such as adjustable current limiting, motor overload and intrinsic device protection and optional thermistor motor protection. The higher the motor rating, the more important these functions because they make it unnecessary to purchase and install protection equipment such as overload relays. Internal intrinsic device protection prevents the thermal overloading of the thyristors and the power section defects this can cause. As an option the thyristors can also be protected by semiconductor fuses from short-circuiting.