1、With IP55 waterproof grade, the switch has a waterproof function, which can effectively insulates water from damage. 2、The switch can control the asynchronous motor overload, open phase, short circuit protection and infrequent start. 3、Being used for power distribution line protection and infrequent load conversion, the switch can also be used as an isolator. 4、Generally used under and 380V voltage, user can connect one more line to use the 380V. 5、With simple installation, user just need inatall the switch and press the black button. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!