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Application The Switches are intended to monitor the operating status of fans, pumps, elevator, lift and motors and the like,widely applied in Electric Power Industry,Minering,Home or Building Automation. Operating Instructions (A)The Series of Current Switches offer an input to equipment under normal operating conditions. Where failure or malfunction of the current switch could result in personal injury or property damage to the controlled equipment or other property, additional precautions, must be designed into the control system. Incorporate and maintain other devices such as supervisory or alarm systems or safety or limit controls intended to warn of , or protect against, failure or malfunction of the Series. (B)These self-powered switches can be hung or tied directly to cables or wires. For use on existing installation, split core models can be installed without disconnecting cables. LED indicators provide a visual confirmation that the current is passing through the core. Both fixed and adjustable set points are available. The adjustable models easily adjust the set point with a potentiometer. Warranty & Return 1.24 MONTHS QUALITY guarantee. Warranty : In the process of Exchanging products Buyer shoud bear freight of return shipping, while Manufactuer should bear freight of sending. 2.Buyer can return products and get FULL REFUND of item value within 30 days after receiving , if there's any quality problem in original products; Freight of return should be beard by manufacturer.