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 February 14, 2017 -  Meters & Detectors (https://www.eleccircuit.com/meter/)  32 Comments (https://www.eleccircuit.com/over-voltage-and-low-voltage-protectioncircuit/#comments)
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This is an over
Circuits
and under voltage
protection circuit
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device sound
disappeared.
electronic-circuits/)
when too much
Amplifiers
voltage 220V, and
(https://www.eleccircuit.com/amplifier-
protection when pressure is too low with Using
the
circuit/)
relay cut off power when voltage problems. In
particular, If the voltage of the motor is lower, the
Inverters
coils of it can be a burn.
(https://www.eleccircuit.com/12v-to-
Contents [hide]
220v-inverter-circuit-500w/)
1 Simple over and under voltage protection circuit
Power Supplies
2 Over and Under voltage protection of electrical
(https://www.eleccircuit.com/powerappliances
3 Over and under voltage protection circuit
supply-circuit/)
working

4 Build over and under voltage protection circuit
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From the circuit when the
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voltage is 220 volts AC through
Amplifiers
a transformer T1. It serves to
reduce the pressure remaining
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12 volts, through a D1-D4
circuit/)
Inverters
connected to Direct rectifier
bridge circuit. To convert the
voltage, alternating current to
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direct current.
220v-inverter-circuit-500w/)
Then, through the C1 and C2 to
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IC1, a loan IC Rex bit computing
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High Voltage ICs, if this current work to the Q1
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Thus cutting off power from
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the load instantly.
The IC2/2 serves to detect the lower voltage. The
About us
two components can be specified by VR1, VR2.
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LED1 display when power or low power over a
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specified.
The parts list
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IC1___________LM324_ Quad/ 1MHz/ Operational
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Amplifiers for Commercial/ Industrial/ and
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Military Applications
IC2___________LM7812_______12V 1A DC voltage
Circuits
regulator IC
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Q1____________2N3904__45V 100mA NPN
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Transistor
D1-D4_________1N4007___1A 1000V Diode
Amplifiers
ZD1___________6V 0.5W Zener diode
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ZD2___________6.8V 0.5W Zener Diode
C1_________470µF
circuit/)
25V Electrolytic Capacitors
C2,C3_________0.1µF 63V Polyester Capacitor
Inverters
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How to builds
220v-inverter-circuit-500w/)
This circuit is very useful. If you are interested in
Powercreating.
Supplies
It’s not too difficult. Because there is
less equipment. And it certainly easy to buy. All
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equipment will be soldered onto the PCB
supply-circuit/)
purpose.

Should be careful polarity of the diodes,
Zener diodes, electrolytic capacitors types
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Over and Under voltage protection of electrical
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Blog is an over and under voltage protection to all
electrical appliances are safe. We use electronics
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circuits, high accurate work is fast LM393,
AboutAN6780
us
and more. Which cut off currents with
power relay.
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I’ve presented this way, it is Over & Under Voltage
protection circuit. But today, I’d recommend this
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because there is a very good following.
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1. The relay will work all time in under or over
electronic-projects/)
voltage range.
2. This
Circuits
circuit will time delay all time when under
or over voltage or power outage awhile.
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3. Can use full performance, though under
electronic-circuits/)
voltage to 12
volts or over voltage to 380 volts
4. Can be adapted to the circuit breaker when the
Amplifiers
power falls to 180 volts (or much – less).
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5. Can be adapted to the circuit breaker when the
power
circuit/)
is too high from 240 volts or more (or
much-less).
Inverters
Over and under voltage protection circuit
working
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As Figure 1 is circuit diagram of this project. The
Powervoltage
Suppliesinput
is entered to a transformer that
designed with primary of 380 volts and
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secondary of 20 volts. From transformer feature
supply-circuit/)

ed-chasercircuit/)
0-50V 3A DC
Variable
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0-50v-3avariable-dcpower-supply/)
20W Integrated
Amplifier
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20wattintegratedamplifier-bytda2005/)
100W inveter
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nverter-12v-to220v-100wtransistor/)
TDA2050 Amps
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da2050amplifierstereo-35w75w/)
5V,6V,9V,12V
DC Regulator
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eccircuit.com/r
egulator5v6v9v12v-1aby-ic780578067809
7812/)
1200W
MOSFET
Amplifier
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
as above will cause can get voltage at secondary
of 12 volts. When the input voltage is 220 volts as
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 normally.
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LM317 Variable
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ariable-powersupply-usinglm317-circuit/)
Figure 1 the over and under voltage protection
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circuit diagram
electronic-projects/)
And will be output voltage of 9.5 volts. When
Circuits
voltage
FOLLOW US
drop down to 180 volts, this voltage as
above will entered to diode rectifiers D1-D4.
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

Notice: we use primary coil transformer is 380
(https:/
electronic-circuits/)
(https:/ /www.f
voltage.
Amplifiers
/twitter aceboo
volts to protect them Not damaged by too over
(https://www.eleccircuit.com/amplifierThe voltage that through a rectifier
circuit will be
.com/e k.com/
separated to two way. First will be entered to IC3-
circuit/)
LM7809 to The ability to maintain fixed voltage all
Inverters
time. Although the input voltage is lower as 110
volts or higher 380 volts to
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The circuit has excellent
them.
performance at all
times.
Power Supplies
The other way voltage will
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leccirc eleccir
uits)
cuits)

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be entered to R1, R2
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and IC1 to compared with standard voltage from
supply-circuit/)
R5 and maintain fixed voltage to 5 volts stable by

a zener diode-D5.
om/u/ (https:/
0/1033 /www.

VR1 will adjusted voltage lower than pin 6 just
25173 pintere
slightly,and will higher, when input voltage higher
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38256 st.com
 this
Blog setting voltage. The output voltage at pin 7
54701 /elecci
will be positive to enter through D6, D8 and R8 to
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base of Q1 cause Q1 working.
73)
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While LED-D9
will grow to indicate we know that
hannel
the circuit worked from the over voltage.
Circuits
The working of Q1 will makes
(https://www.eleccircuit.com/simple-
/UCqp
pin 3 of IC2-
qwVK5
AN6780 has electrical potential as the ground,
electronic-circuits/)
cause output at pin 6 is positive, Q2 will work and
Amplifiers
reduce
YK4J4
voltage at base of Q3 to lower until Q3
3ZKQn
stop. The relay will break the circuit to protect the
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circuit that we use.
PCEdA
circuit/)
Read Datasheet of AN6780
Inverters
)
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When input voltage is normally high. The Q1’s
Power Supplies
base voltage will reduced until Q1 stop working.
But IC2 will still continually
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works with time about
for 3 minutes. Then relay so connects power to
supply-circuit/)
the normally electrical appliances.

Relationship
(https:/ voltage current
/www.e resistance and
leccircu Ohms Law
it.com/ (https://www.e
relation leccircuit.com/
ship-
relationship- 
The VR2 will adjust the voltage at pin 2 higher
-
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slightly than pin 3.
current-
 Blog
When input voltage lower than setting, when
voltage at pin 2 lower than
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voltage
pin 3 will get positive
voltage output pin 1 of IC1b fill through D7, D9
About us
resista
nceohmslaw/)
voltagecurrentresistanceohms-law/)
JANUARY 6, 2019 /
2 COMMENTS
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VOLTAGE-CURRENT-RESISTANCE-OHM
LAW/#COMMENTS)
cause Q1 also work at over voltage.
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LED-D11 will indicate the under voltage.
us/)
LED-D10 will indicate the over voltage.
Projects
Build over and under voltage protection circuit
(https://www.eleccircuit.com/easy-
As Figure 2 is the actual size of single-sided
copper PCB layout.
electronic-projects/)
And assemble on PCB as
Figure 3 completely. Then test the working of the
Circuits
How to use
(https:/ easily LEDs
/www.e (https://www.e
leccircu leccircuit.com/
it.com/ how-to-basichow-to- use-leds/)
basic- JANUARY 2, 2019 /
useleds/)
circuit with applies a normal voltage to the circuit.
How to use
(https://www.eleccircuit.com/simple-
The three LEDs will go out, next 3-5 minutes long
LED D12 lights
electronic-circuits/)
to show that the circuit functions
normally.
Amplifiers
resistor
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leccircu
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how-touse-led-
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battery
/)
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Reduce
Voltage for
LED more load
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how-to-useled-with-3vbattery/)
DECEMBER 30, 2018 /
1 COMMENT
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220v-inverter-circuit-500w/)
content/uploads/2014/07/the-PCB-layout.jpg)
2
PowerFigure
Supplies
the PCB layout
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
(https:/ Convert a
/www.e galvanometer
leccircu to voltmeter
it.com/ (https://www.e
convert leccircuit.com/
convert-a-a-

galvanometer-
l
to-voltmeter/)
galvano to-voltmeter/)
meter-
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tovoltmet
 Blog
DECEMBER 30, 2018 /
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er/)
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Dual LED
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(https://www.eleccircuit.com/aboutcontent/uploads/2014/07/the-componentus/)
(https:/
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layout.jpg)
leccircu
Figure 3 the component layout.
it.com/
Projects
For LED D9, D11 if growing in this time, to adjust
(https://www.eleccircuit.com/easy-
VR1, VR2 until both LEDs go out.
electronic-projects/)
Then test to reduce
the voltage to 180 volts while
adjusting VR2 until LED-D11 grow and within LED-
dual-
using PNP
transistors
(https://www.e
leccircuit.com/
dual-led-
ledflasherby2n2907
/)
Flasher circuit
flasher-by2n2907/)
DECEMBER 20, 2018 /
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Circuits
D12 will go out. That show relay stops working
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and cut voltage of out the protected circuit show
that it normally working.
electronic-circuits/)
Next
Amplifiers
test add voltage rises up to 240 volts, then
adjust VR1 until LED-D9 will grow while LED-D12
(https://www.eleccircuit.com/amplifier-
will go out, it indicated the relay stop and cut off
circuit/)
voltage to also protect the circuit.
Inverters
If you do not have the AC variable voltage supply.
You may use DC power supply
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adjustable voltage
between 6-20 volts to connects at TP point. By
220v-inverter-circuit-500w/)
the voltage of 13.5 volts will same input voltage
PowerofSupplies
180 volts
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and 17.8 volts for 240 volts
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voltage protection
S U BMIT
supply-circuit/)


IC1_____________LM393 Low Offset Voltage Dual
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Comparators
General Purpose Long
 IC2_____________AN6780
Blog
Interval Timers
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IC3____________LM7809____9V Fixed Regulator
AboutIC.
us
Q1, Q2__________BC547____0.4A 40V NPN
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Transistor
us/)
Q3_____________BC337____0.8A 40V NPN
Transistors
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D1-D4__________1N4007____1A 1000V Diode
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D5_____________Zener 5V 0.5W
electronic-projects/)
D6, D7__________Zener
3.9V 0.5W
D8, D9, D13______1N4148
Circuits
D10, D11, D12____LED___as you want.
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The resistors 0.25W
electronic-circuits/)
R1, R2___________27K
Amplifiers
R3, R5___________15K
R4_______________12K
(https://www.eleccircuit.com/amplifier-
R6, R7, R14________820 ohms
circuit/)
R8, R12___________24K
R9________________910
Inverters
ohms
R10_______________180K
(https://www.eleccircuit.com/12v-to-
R11_______________220 ohms
220v-inverter-circuit-500w/)
R13_______________68K
R16___________1K
PowerR15,
Supplies
The Capacitors
(https://www.eleccircuit.com/powerC1________________470uF 35V Electrolytic
supply-circuit/)
capacitors

C2, C4_____________0.1uF 63V Polyester

Capacitor
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C3________________10uF 16V Electrolytic
 capacitors
Blog
C5________________470uF 16V Electrolytic
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capacitors
AboutRY_______________9V
us
Relay 1 contact.
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us/)
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contact-ac-detector-voltage-tester(https://www.eleccircuit.com/12v-tousing-cd4060/)
220v-inverter-circuit-500w/)
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ccircuit.com/ove
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voltage-
 July 11, 2014
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 May 29, 2017
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 THIS POST H AS 32 COMMENTS
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some
Circuits
15 AU G 2012
REPLY
thing is wrong.the positive side of one of
the z-diode should be in the non-inverting input.
(https://www.eleccircuit.com/simple-
the other positive side of the z-diode to the
electronic-circuits/)
inverting input
of the other opamp, so to set the
low and high cutoff.
Amplifiers
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Gaurav
14 D E C 2012
REPLY
13 S E P 2013
REPLY
circuit/)
kit pot seting.
Inverters
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Cruz Rdriguez
220v-inverter-circuit-500w/)
What is wrong in the circuit schematic is the pin
Powerdesignation
Supplies
on IC2/2. Pin 6 is negative and pin 5
positive.
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saad

23 S E P 2013
REPLY

thnxs if you are
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 Blog
Sakhilal Manjhi
11 OCT 2013
REPLY
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Sir I want to know the working of each
Aboutcomponent
us
saperatly on the circuit. so please
provide me the information as soon as possible.
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helicoms (https://zilliongroup.co.ke)
18 OCT 2013
REPLY
Projects
why not consinder using lm 358 instead of lm
(https://www.eleccircuit.com/easy-
324?since 324 has four op amps and 358 has
two
electronic-projects/)
Circuits
cracker
21 OCT 2013
REPLY
(https://www.eleccircuit.com/simple-
you use a lot of components. Why not use a
electronic-circuits/)
window comparator with 1 reference zener diode
Amplifiers
and 2 pots.
(https://www.eleccircuit.com/amplifier-
Florian Ion
circuit/)
Cracker
Inverters
8 JAN 2014
REPLY
7 FEB 2014
REPLY
is right. Helicoms is right.
Circuit is wrong.
(https://www.eleccircuit.com/12v-to-
Please be carefully.
220v-inverter-circuit-500w/)
Power Supplies
tejaswi
(https://www.eleccircuit.com/power-
sir i want explanation of the whole circuit please
supply-circuit/)

daniel
20 FEB 2014
REPLY

sir can you please tell how to sets pot1 and pot
2? thank you.
(https://www.eleccircuit.com/)
 Blog
siva
(https://www.eleccircuit.com/blog/)
Abouthow
us
21 M AR 2014
REPLY
can you calculate variable resistor value ?
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gebreabzgi (https://google)
11 APR 2014
REPLY
how we can analysis the above circuit
Projects
(https://www.eleccircuit.com/easy-
Cna
22 JU L 2014
REPLY
electronic-projects/)
Thanks for every thing it is a perfect circuit
Circuits
(https://www.eleccircuit.com/simple-
Mrunal
7 JAN 2015
REPLY
electronic-circuits/)
Circuit is gud. but I am confused that who will
Amplifiers
protect
this circuit itself?! As transformer will
burn due to over voltage.
(https://www.eleccircuit.com/amplifiercircuit/)
Vishnu
12 JAN 2015
REPLY
Inverters
Sir
(https://www.eleccircuit.com/12v-to-
I want to know about the designing of various
220v-inverter-circuit-500w/)
components in the
circuit..
Power Supplies
dlaw
(https://www.eleccircuit.com/power-
18 FEB 2015
REPLY
sir ic1 pin 8 to 14 and ic2 pin 4,8,9,10,12,13,14.
supply-circuit/)
what is the fuction because they are not

connected.

(https://www.eleccircuit.com/)
momename (https://www.eleccircuit.com)
18 FEB 2015
REPLY
 Blog
Hi dlaw,
(https://www.eleccircuit.com/blog/)
Thanks for your feedback.
This circuit use 2 op-amp of 4 op-amp in IC-
About us
LM324.
(https://www.eleccircuit.com/aboutus/)
vamsi
21 NOV 2015
REPLY
Projects
Dear sir,
(https://www.eleccircuit.com/easythe above circuit you posted
is very interesting to
me. Really I’am very thankful to you for that.
electronic-projects/)
But,can you please clarify me before i test the
Circuits
circuit.
In the given schematic diagram
(https://www.eleccircuit.com/simple-
and in PCB layout
D6,D7,D8,D9 are mentioned as 1n4148 zeners.
electronic-circuits/)
and given in the parts list are D6,D7 = 3.9v 0.5w
Amplifiers
and D8,D9
= 1n4148 which one is correct…?
i got all the components from the market except
(https://www.eleccircuit.com/amplifier-
AN6780 long interval timer. so, can u please tell
circuit/)
me shall i connect Q1 547 collector directly to
R12
Inverters
24K resistance by removing five components
IC2 , C3,C4,R10 and R11 ( Removing timer circuit)
(https://www.eleccircuit.com/12v-to-
….? Thanks in advance…..:)
220v-inverter-circuit-500w/)
Power Supplies
Arend van der Weide
29 JAN 2016
REPLY
(https://www.eleccircuit.com/power-
I have build the circuit with lm358.
It works the
supply-circuit/)

Thanks
first time.

rafi
29 M AR 2016
REPLY
1 APR 2016
REPLY
(https://www.eleccircuit.com/)
This are tested ???????
 Is
Blog
it work???
(https://www.eleccircuit.com/blog/)
Aboutkwame
us
please i saw a similar post
(https://www.eleccircuit.com/aboutus/)
in this link
https://freecircuitworks.blogspot.com/2016/03/l
ow-battery-protection-and-alarm31.html
Projects
(https://freecircuitworks.blogspot.com/2016/03/
low-battery-protection-and-alarm31.html) which
(https://www.eleccircuit.com/easy-
uses p mosfet or relay. i want members to check
electronic-projects/)
if i can also use that
Circuits
(https://www.eleccircuit.com/simplelachhman Singh
electronic-circuits/)
please clrify
1 APR 2016
REPLY
regarding D6,D7 whether thes are
Zenor or ordinary diod
Amplifiers
(https://www.eleccircuit.com/amplifier-
martin
30 M AY 2016
REPLY
circuit/)
where can i get the under and over voltage relays
Inverters
input supply 550v output 550v
(https://www.eleccircuit.com/12v-to220v-inverter-circuit-500w/)
Kamran
PowerI read
Supplies
it and
24 NOV 2016
REPLY
evaluate the circuit very carefully. I
found this is really very interesting and attractive
(https://www.eleccircuit.com/power-
not only in term of home appliances protection
supply-circuit/)
but also the industry with little amendments. Only

would interested to know how we can provide

additional back emf’s protection. Because in case
of low or high with relay tripping it might have
(https://www.eleccircuit.com/)
the back EMF that may harm for the
 produced
Blog
attached appliances.
(https://www.eleccircuit.com/blog/)
Hope my comments would be useful for further
Aboutevaluation,
us
awaiting comments.
Regards/Kamran
(https://www.eleccircuit.com/about-
Mob: 00966 500193412
us/)
Projects
dentra
6 FEB 2017
REPLY
(https://www.eleccircuit.com/easy-
Please, Can you assist us with the following:
electronic-projects/)
To design a safety
circuit that should provide for
household
Circuits
appliances for over-and undervoltage protection.
(https://www.eleccircuit.com/simple-
The protective
circuit must
electronic-circuits/)
immediately switch off upon
detection of low-and
Amplifiers
high-voltage household appliance and upon
(https://www.eleccircuit.com/amplifierdetection of normal voltage
switch on again after 3 minutes.
circuit/)
The protective circuit must comply with the
Inverters
following:
If the line voltage is within
(https://www.eleccircuit.com/12v-to-
the normal range (100
to 130V ac), it
220v-inverter-circuit-500w/)
will wait for the protective circuit 3 minutes
Powerbefore
Supplies
the
output will
be energized. During these 3 minutes there is an
(https://www.eleccircuit.com/power-
amber LED light.
supply-circuit/)


If the line voltage is outside the normal voltage,
the output of the
(https://www.eleccircuit.com/)
circuit will never be under tension.
 protective
Blog
If the line voltage is less than 100VAC, the
(https://www.eleccircuit.com/blog/)
protection circuit “low
Aboutvoltage”
us
must indicate by a red LED that lights up.
If the line
(https://www.eleccircuit.com/about-
voltage is present, the protection circuit must
us/)
pass a voltage greater
than
Projects
105 Vac “normal tension” it will indicate by a
green LED that
(https://www.eleccircuit.com/easy-
lights up.
electronic-projects/)
Similarly, the
line voltage protective circuit has to
be higher than
Circuits
130V ac “high voltage” will be indicated by a red
(https://www.eleccircuit.com/simple-
LED that lights up.
Only when a
electronic-circuits/)
voltage is less than 125VAC, it must
indicate the
Amplifiers
protection circuit “normal tension” by a green LED
(https://www.eleccircuit.com/amplifier-
that lights up.
Upon
circuit/)
detection of over-and under voltage
protection, the circuit
Inverters
should give a beep of 5 seconds. This should be
(https://www.eleccircuit.com/12v-toconstructed with an
opamp oscillator circuit in this functionality.
220v-inverter-circuit-500w/)
Power Supplies
Askenaw
11 FEB 2017
REPLY
(https://www.eleccircuit.com/power-
how can analysis the above circuit brife
supply-circuit/)
calculation each value


Ebrahim
1 M AR 2017
REPLY
(https://www.eleccircuit.com/)
Hi,How to add time delay to this circuit with 324 C
 &Blog
D?Thank u.
(https://www.eleccircuit.com/blog/)
Pogs (https://NA)
AboutJames
us
Hai sir, may i ask if the D6
(https://www.eleccircuit.com/aboutus/)
10 M AR 2017
REPLY
D7 are Zener diode or
just a 4148 diode? the list of component says
that it is a zener diode but in the circuit diagram it
Projects
is a
4148 diode. Which is correct?
(https://www.eleccircuit.com/easy-
Abhijit Maity
electronic-projects/)
very
Circuits
14 JU L 2017
REPLY
28 S E P 2017
REPLY
nice . thanks
(https://www.eleccircuit.com/simple-
Daniel Nguyen
electronic-circuits/)
A hydraulic pump with a motor 15 HP, 480V, 3PH
Amplifiers
is powered by a combination starter with a 40A,
(https://www.eleccircuit.com/amplifier3P, 480V Allen-Bradley circuit
breaker. Pump runs
normally for a pressure at 300psi, and current
circuit/)
12A. When the pressure in a hydraulic tank
Inverters
reduced to very low level about 50 psi then the
circuit breaker is tripped at
(https://www.eleccircuit.com/12v-to-
a current 9A and the
display screen showed “underload”. Could you
220v-inverter-circuit-500w/)
please explain why the circuit breaker tripped at
Power Supplies
low current below overload circuit trip ? It
happens again many times
(https://www.eleccircuit.com/power-
if the pressure would
drop to very low levels.
supply-circuit/)
Thank you


Gari Dizon
23 OCT 2018
REPLY
(https://www.eleccircuit.com/)
Dear Sir,
 Please
Blog
design a circuit board that should provide
for AC220V power fluctuation protection. The
(https://www.eleccircuit.com/blog/)
protective circuit must immediately switch ON a 3
About us
phase circuit breaker shunt coil (coil voltage is
220VAC) in the event of power
(https://www.eleccircuit.com/aboutus/)
fluctuation. Thank
You
Projects
ElecCircuit.com (https://www.eleccircuit.com)
(https://www.eleccircuit.com/easy-
24 OCT 2018
REPLY
electronic-projects/)
Hi, again
Circuits
First, I am sorry. I cannot design a new circuit
for you. Because I do not have free time.
(https://www.eleccircuit.com/simple-
But I want to help you a lot. Your job is
electronic-circuits/)
important.
This circuit idea may help you.
Please understand here is just an idea for
Amplifiers
learning. It may be not good in real use.
(https://www.eleccircuit.com/amplifiercircuit/)
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