True or False: Arrestors contain semiconductor blocks that allow large currents to pass harmlessly to ground.

The statement is accurate because arrestors, particularly surge arresters or lightning arrestors, are designed to protect electrical systems from voltage spikes by diverting excess currents away from sensitive components. These devices typically incorporate semiconductor technology, which enables them to handle large currents efficiently. When a surge occurs, the semiconductor blocks activate to provide a low-resistance path to ground, allowing the harmful excess current to be safely dissipated, thereby preventing damage to the electrical system.

While there are different types and models of arrestors, the key function of allowing large currents to pass harmlessly to ground is a characteristic feature common to many designs, affirming the truth of the statement. This highlights the essential role of semiconductor technology in modern protective devices against electrical surges.