Features: Control various automation industrial equipment, flashlights, buzzers, relays, microcontrollers, or other electrical load devices. Compared with traditional device, thermal protectors and other devices, it has the advantages of high accuracy, stable performance and long service life. An ideal choice for automated industrial equipment and power monitoring. Widely used in substation, frequency conversion speed control device, inverter device, electrolytic plating, electric locomotive, street lamp monitoring, coal mine and other automation industries that need current monitoring. The current sense switch is for safety, simple, and convenient monitoring or detection of current in the electrical equipment. Using the principle of electromagnetic mutual inductance of current, the advanced output detection, monitoring and protection alarm products developed by the non-power supply technology are adopted. Specification: Switch Type:Normally Open/Normally Closed(Optional ) Power Supply:Self-Powered,No External Power Supply is Required. Starting Current / Frequency Range: 0.2-30A, 40-400Hz Startup Time: <0.1 Seconds Switch Contact Capacity: Maximum: 0.5A@12-240VAC/DC Overload Capacity: +100%@30A Threading Hole Diameter: 8mm Indicator Light: Red and Green Installation Form: Guide Rail 35mmDIN Shell Material: Fireproof ABS Working Temperature: -10~55 °C Working Humidity: 0-95%, No Condensation IP Rating: IP30 Size:52 x 68 x 25mm / 2.05 x 2.68 x 0.98in Package List: 1 x Sensing Switch 1 x Users Manual(Chinese & English) .