Water heater is much available (RCD)
Note: under normal circumstances, over-current release with the release of the armature; in case of serious overload or short-circuit fault, the coil in series with the main circuit will produce strong electromagnetic force to the armature to attract the top lock hook, to disconnect the main contact. Undervoltage tripping device of the work on the contrary, the voltage is normal, the electromagnetic suction Xizhu armature, the main contact is closed. When the voltage drops or the power is off, the armature is released and the main contact is disconnected. When the power supply voltage returns to normal, it must be switched on before it works to realize voltage loss protection. Install air switch to electric water heater must be the regular manufacturer, has installed air security.
1. power below 6KW, you can install a 30A air switch can be met, and the total air switch must be greater than 40A.2. power 7-8KW, the need to install the 40A air switch is appropriate, then the total air switch must be more than 60A to meet.
As to how much air switch you need, it depends on how much power you buy, that is, what is the rated power and how much air switch you buy.
