Low High Voltage Cutoff Circuit Diagram

The ac mains high and low voltage cut off circuit explained in this article is very easy to build and yet very reliable and accurate.

Low high voltage cutoff circuit diagram.

Automatic high voltage and low voltage cutoff circuit12. As a result transistor q1 is in on and transistor q2 gets switched off. So it helps to protect the circuit damage by the high voltage. High voltage low voltage cut off circuit.

The op amp is available in to 5 and dip type packing. Plzz tell me the high low voltage cutoff with delay and alarm with some modification and advancement in circuit diagram. Before using this circuit set the preset and check the relay or output to at which input voltage level relay gets activated. If you use this circuit for autocut on over 6v then use 6 v relay and circuit need 6v.

This voltage sensor circuit can be used to protects any appliance to voltage fluctuation. Circuit description of high low voltage cutout circuit the circuit of high low voltage cutout is shown in figure 1. As explained above the transistors sense the presence of the dangerous voltage levels respectively and activate. Low voltage cut off op amp figure 2 shows the use of very common and easily available op amp 741 as a comparator.

An ideal low battery cut off circuit should have zero on resistance zero power consumption when the switch is off and zero power. High and low voltage cutoff with delay and alarm principle. The main building block of this circuit is timer ic 555 voltage regulator ic and few other active as well as passive electronic components like transistor resistor capacitor etc. When supply voltage is high the dc voltage at the cathode of zener diode d4 becomes greater than 5 6v.

An almost ideal low battery cutoff circuit draws only 1 2 μa. When the input voltage goes high then the relay will be activated and also when the input voltage is below then required level then relay activated. Over voltage and under voltage protection circuit for high and low voltage cutoff.