RCD blocks are residual current devices suitable for assembly with a standard MCB. The residual current operated circuit-breaker obtained in this way maintains both the electrical characteristics of the MCB and those of the RCD block.

The RCD block DDA200 series is suitable for assembly with MCBs S200 series and S300P. It assures protection against the effects of sinusoidal alternating earth fault currents, protection, against indirects contacts and additional protection against direct (with sensitivity = …

RCD blocks type B are able to provide protection in case of sinusoidal, direct pulsating, high frequency and smooth direct earth fault currents. DDA200 type B are devices to be coupled with S200 up to 63A with lower or equal

在低压电网中安装剩余电流动作保护器（residual current operated protective device，简称为RCD，以下简称剩余电流保护器）是防止人身触电、电气火灾及电气设备损坏的一种有效的防护措施。

circuit-breakers and blocks was designed to overcome the problem of unwanted tripping due to overvoltages of atmospheric or operation origin. The electronic circuit in these devices can distinguish between temporary leakage caused by disturbances on the mains and permanent leakage due to actual faults, only breaking the circuit in the latter case.

The RCD Block DDA800 series assures protection to people and installations against fault current to earth. A large offer for standard instantaneous and selective AC and A types is completed with some configurations for special applications. This product is suitable for assembly with MCBs S800 series up to 63A. 5.

The RCD block DDA200 series is suitable for assembly with MCBs S200 series. It assures protection against the effects of sinusoidal alternating earth fault currents, protection, against indirects contacts and additional protection against direct (with sensitivity = 30 mA) contacts. Applications: residential, commercial, industrial.

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• RCD blocks. RCBOs combine, in a single device, the residual current function and the overcurrent protection function typical of MCBs. RCBOs are tripped by both current leakage to earth and overloads and short-circuits and they are self-protecting up to a maximum short-circuit current value indicated on the label.

A SENTRON residual current protective device (RCD) by Siemens protects humans, assets, and plants, and safely cut power when a fault occurs.