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MOV or no MOV?

B

BossNoodleKaboodle

[H]ard|Gawd
Joined
Dec 6, 2004
Messages
1,818
Does APC use MOV's in their SmartUPS to supress surges? If so, do these MOV's account for its AVR functions? If not, how do they work exactly?
 
gee said:
Ice Czar said:
what I dont know is the typical surge suppression scheme of a common SPS
but Im now looking for it :p
Click to expand...
AC input -> fuse -> MOVs connected across input -> line filter -> rectifier -> ....

MOV's are "metal oxide varistors" - they're sort of like a zener diode, but bidirectional. They act as an open circuit across the AC line until the voltage reaches a certain point, then when that happens they basically short out the line. So If a power surge occurs, the MOVs will conduct at the higher surge voltage and blow the fuse.

"Surge supressor" power bars just contain a bunch of MOVs. Decent ones have a circuit breaker before the MOVs which will trip with the high current, but cheap ones just rely on your house's circuit breaker to trip.

There's no super-extra-high-advanced technology inside Monster power strips or anything. This stuff has been around since the 60's. :D
Click to expand...


according to our EE ;)
 
Ice Czar said:
according to our EE ;)
Click to expand...

Good info but doesn't really answer the question. A UPS is quite a bit different than a Monster brand surge supressor. I thought UPS's use something else to protect against surges but I may be mistaken.
 
SPS = Line Interactive UPS

technically they are Standby Power Sytems not Online Uniterruptable Power Systems

the difference is typically that when its on the mains, it uses MOV tech for surge suppression
(or at least most do) but when its on the battery the power is isolated from the mains and drawn from the batteries throught the inverter and to the PSU like an online UPS does all the time and surges from the mains are impossible, the battery chargers fuse would blow, and evenm if it didnt the batteries are a buffer
 
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