This controller uses a new high power bi-directional SCR. It can be very convenient to adjust the current up to 2 and solve the overcurrent problem of the heating wire resistance too low in the case of cooling causing good.The voltage of Output is adjusted anywhere between 50V-220V for use with electrical appliances. It can be used as an electric stove, water heater heat adjustment, lighting dimmer, small motor speed, electric iron thermostat, and achieve dimming, thermostats, pressure regulator effect.< /p>Specification:Input power supply voltage: 110V~250V ACThe output voltage: 50V-250V (Output voltage Less than or equal to Input power supply voltage)The maximum output power: 2000WThe maximum output current: 25AThe voltage regulation range: 50V-250V AC (Output voltage Less than or equal to Input power supply voltage)The operating environment temperature: -20C-40CSize: approx . 473527mmPackage Included:3pcs 50-220V 25A AC Motor Speed Controller