Protect circuits from transient surges: When a circuit is connected or disconnected, surge currents and voltage fluctuations may occur, damaging sensitive equipment (such as motors, capacitors, and precision instruments).
The SRTD22-99 uses a time delay function to mitigate these surges. For example, when a motor is started, a relay delays the main circuit, allowing auxiliary circuits (such as preheating circuits and reduced-voltage starting devices) to operate before full voltage is applied. This reduces the impact of starting current on the motor windings. When a capacitor cabinet is put into operation, a time delay relay prevents the simultaneous connection of multiple capacitors, causing them to be connected sequentially in time periods, protecting the capacitors and the power supply system.
