Start studying MOT CON level 2 lesson 4. There is no setting for maximum torque angle in numerical relays.The overcurrent relays, even though simplest of all types of electromechanical relays, are the most difficult static relays. An electromechanical relay may feature one or many special attributes. Dry reed relays are … Among other things, solid-state relays ensure reliable switching operations in system automation. Features . A protective system is formed by static relays and electromechanical auxiliary relays. Relays convert an electrical input signal on the primary side to an intermediate and non-electric physical signal.