Automatic Tongou Differential Cutout, 40 A-30 Ma, 400 V

Here is an improved version of the product description for the type B alignment switch (RCCB):

Versatile AC / DC detection. This type B residual switch detects not only normal alternating current (AC), but also alternating current with high frequency, and even small residual current currents (DC), making it very versatile and reliable. It is particularly approved for use in wall boxes and charging stations.

High shutdown and increased safety. Thanks to the sensitivity of contacts of 30 mA and high switching capacity to 10 ka, this RCCB provides strong protection. It has a protective cover on internal screws, providing insulation and seal. The integrated display window also allows you to easily identify RCCB errors.

Optimal fire and fire protection. RCCB type B switchs are able to detect both high frequency alternating currents and DC residual currents, significantly reducing the risk of fire and electric shock by automatically shutting down the power supply. The choice of the respective RCCB type is crucial to ensuring this increased level of protection.

Wide application and functionality. Designed for controlling circuits, protects people from intermediate touch and provides additional protection against direct touch. It also protects systems against fire-threats caused by insulation defects. Commonly used in residential buildings, industrial sectors and EV / PV systems, this RCCB is ideal for frequency converters, UPS systems, high frequency power converters and power cabinets.