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.

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. High voltage low voltage cut off circuit. An almost ideal low battery cutoff circuit draws only 1 2 μa. The op amp is available in to 5 and dip type packing.

The circuit utilizes a single ic lm 324 for the necessary detection and instantly switches the relevant relays so that the connected loads are isolated from the dangerous inputs. High and low voltage cutoff with delay and alarm principle. Automatic high voltage and low voltage cutoff circuit12. When supply voltage is high the dc voltage at the cathode of zener diode d4 becomes greater than 5 6v.

Before using this circuit set the preset and check the relay or output to at which input voltage level relay gets activated. So it helps to protect the circuit damage by the high voltage. As shown in the circuit diagram a couple of transistor stages are integrated together along with an output relay which is able to perform the function of super safe voltage guard equipment. An ideal low battery cut off circuit should have zero on resistance zero power consumption when the switch is off and zero power.

Juliet 8 years ago plzzzzz tell me the size of the auto transformer to be used and i didnt get what is no n where exactly the appliance to be checked should be kept kind request to you to send me all the details of working. If you use this circuit for autocut on over 6v then use 6 v relay and circuit need 6v. Low voltage cut off op amp figure 2 shows the use of very common and easily available op amp 741 as a comparator. 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.

As a result transistor q1 is in on and transistor q2 gets switched off. Circuit description of high low voltage cutout circuit the circuit of high low voltage cutout is shown in figure 1. Over voltage and under voltage protection circuit for high and low voltage cutoff.