Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [surge-protection]

Questions about protecting electrical devices from voltage spikes.

352 questions
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Why is daisy-chaining surge protectors not recommended?

I know MOVs inside surge protectors degrade over time, but I also see manufacturers putting notes on the box that the protection warranty is void if I daisy-chain surge protectors. So questions: Is there an estimate of what the life of a MOV is…
sekharan
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Can all surge protectors wear out, and how would you know if this is the case with the surge protector you have?

This question follows from this other question where the OP mentions that: I know MOVs inside surge protectors degrade over time Based on this it seems that surge protectors eventually deteriorate past a point where they do not provide (expected)…
user64167
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3 answers

Protecting a circuit when working voltage is close to the absolute maximum

I designed a step down converter using WEBENCH. It takes 8-24V DC input and outputs 5V. The basic design works fine, but I learned from this question about why it died when I connected it to a 24V power supply that was already turned on. I did some…
David
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Surge protector helped me discover bad wiring at home -- neutral and line swapped; should I be concerned?

I purchased two surge protectors and when I plugged them in at two different receptacles in my apartment, I noticed that the 'grounded' light did not illuminate on any of them. To shorten the story, I discovered that at every single receptacle in my…
jaromey
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Using common mode inductance or differential mode inductance in a power circuit?

The question derives from my last question. When the power circuit is powered up, there is surge because of the input capacitor. The surge is a differential mode signal. So to reduce the surge, why not use a differential mode inductance? Why is a…
T L
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Does whole house surge protection device (SPD) protect from Ground (PE) surges?

I've been researching on whole house surge protection devices and came across an Illustration of lightning current flow from a direct strike near the (protected) structure. From my understanding Type 2 residential SPDs divert surges from L-N, L-PE…
Pavin Joseph
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MOVs, thermal fuse and thermal runaway behavior

Above picture is that of a Belden surge protector with some kind of cloth covered over the MOV and thermal fuse for isolation to promote more conduction. I don't want to cover the whole thing with compound but something akin to cloth or other…
Jtl
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Small size clamping device to protect 5V circuit from high voltages

Are there any small size clamping device or ICs to protect a circuit working on 5V? I would like to protect the circuit from high voltage like 200V - 300V. Edit: I want to use SN6501 or MAX845 to make dc-dc converter. The chip should just stop…
zud
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Why does the power light on surge protectors flicker

I've noticed that on several surge protectors from various manufacturers the light usually behind the red power switch will flicker. I found an arstechnica forum discussion that says the light behind the power switch is a neon light and flickers…
Josh
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surge protection

What causes a surge suppressor to fail and burn seriously? I faced two accidents, seemingly similar, in my power distribution system within a period not exceeding 3 months: I had what seemed to be over or surge voltage that destroyed completely the…
fawzy suliman
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Spike and surge protection for electronic boards

I'd like to protect from spike, surge, and so on... an electronic interface that is powered from a 220V / 5V DC power module (AZ Delivery AC-05-3). The board, designed by me, integrate and ESP 32 board and some other ICs. I'm searching for an easy,…
M4Biz
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EN61000-5-4 Surge protection of PCB

We are developing a household device, which consists of a +48VDC power supply and a PCB, where everything is located inside a grounded metal frame. The only parts that come out of the metal frame is a CAN connector and the Power Inlet for…
HansPeterLoft
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Why does wiring to a surge protective device need to avoid sharp bends?

Here is an excerpt from some Schneider Electric installation instructions for their QO2175SB 240V single phase "SurgeBreaker" SPD: NOTE: The SPD ... must be installed as close to neutral assembly and main circuit breaker or main lugs as possible.…
StayOnTarget
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Is it Safe to Plug a Regular Power Strip (with no surge protection) into a Surge Protector Strip?

When I did a Google search I found a lot of different answers, many of which contradicted each other. My understanding is that you shouldn't plug a surge protector strip into a surge protector strip BUT IT IS OKAY to plug a power strip into a surge…
user1822824
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Surge Protection Installation

I have a problem understanding the installation of surge arresters in C&I(Control and Instrumentation) protection. The attached picture says that SPDs(Surge Protection Devices) are installed in the line path. what does it mean? what is the…
MINA ASHTIANI
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