Plug power ratings

[7 5 7]

Possibly a very simple question.

Need a replacement power supply cable, my current/original one states (INPUT 100-240), as it's old I can't get an original cable again, so a replacement one is (INPUT 200-240), what is the difference, and does it matter?

It's powering my broadband modem.

[miniman]

Provided the output is the same, and you’re in the UK, that’s fine.

[7 5 7]

Great, how would I check the output is the same?

[maccboy]

7 5 7 said:

Possibly a very simple question.

Need a replacement power supply cable, my current/original one states (INPUT 100-240), as it's old I can't get an original cable again, so a replacement one is (INPUT 200-240), what is the difference, and does it matter?

It's powering my broadband modem.

It's stating that the input voltage, from your mains supply, needs to be between 100v and 240v, or 220v - 240v. As uk mains is somewhere near 240v, it'll be fine.

[JoshSm]

Is this just a cable or a power supply?

If it's just a cable all that matters is the connectors on the ends, the rest flows from that.

[miniman]

7 5 7 said:

Great, how would I check the output is the same?

Post up a photo.

[7 5 7]

maccboy said:

It's stating that the input voltage, from your mains supply, needs to be between 100v and 240v, or 220v - 240v. As uk mains is somewhere near 240v, it'll be fine.

Ah yes that makes sense then, just wondered why the replacement cable is higher rated to the original, but seems it doesn't matter

[maccboy]

7 5 7 said:

Ah yes that makes sense then, just wondered why the replacement cable is higher rated to the original, but seems it doesn't matter

It's not rated, it's just how tolerant it is to the input voltage.

[7 5 7]

miniman said:

7 5 7 said:

Great, how would I check the output is the same?

Post up a photo.

Original


Replacement

[Simpo Two]

I suspect the '100-240' one was used for US and UK markets (US uses 110V), and that the '200-240' one is for UK modems/products.

[JoshSm]

7 5 7 said:

Original


Replacement

Not the same, one is 12V 2.0A the other 12V 1.5A (24W vs 18W). You can go higher on the amps but not lower. Volts has to be the same value on both.

Also check the output connector is the same size.

[silentbrown]

Simpo Two said:

I suspect the '100-240' one was used for US and UK markets (US uses 110V), and that the '200-240' one is for UK modems/products.

More to the point, the old supply is a 2A one, the replacement is only 1.5A, so may not provide enough power.

[InitialDave]

As above, new unit is only rated at 75% of the output of the old one.

Might be fine, might not. Does the modem itself list current draw on its own label?

But it's 12v DC with a positive centre pin on the jack plug, so other than that should be compatible.

[7 5 7]

InitialDave said:

As above, new unit is only rated at 75% of the output of the old one.

Might be fine, might not. Does the modem itself list current draw on its own label?

But it's 12v DC with a positive centre pin on the jack plug, so other than that should be compatible.

Modem label itself states (Rated Input 12V 1.5A)

[cuprabob]

7 5 7 said:

InitialDave said:

As above, new unit is only rated at 75% of the output of the old one.

Might be fine, might not. Does the modem itself list current draw on its own label?

But it's 12v DC with a positive centre pin on the jack plug, so other than that should be compatible.

Modem label itself states (Rated Input 12V 1.5A)

If that's the case then you're good to go.

[OldGermanHeaps]

You shouldnt run a psu at 100% rated capacity for extended periods of time, there should be some headroom, or it will run hot. You would be better off with a 2 amp or bigger supply.
Especially true as most power supplies are chinese ste now and their rated capacity is often a lie.

[7 5 7]

Thanks everyone for your help, thought this was an easy question.

I've made it even more confusing as posted the wrong "original plug image" see below my current setup...

[InitialDave]

Huh, well, that seems like your "correct" original can't supply the current needed for the modem, so your new one should be better, at least.

[bigpriest]

Surely this is the point where you justify replacing all your kit for upgraded versions - just to be safe

[Griffith4ever]

You are good to go. You are replacing a 1amp (12w) PSU with a 2amp (24w) psu. If it worked with the 12w one it'll work the same or "better" with a 24w one. Your modem will only draw what it needs.

You need not worry about the input voltage unless it said 100v, and NOT 220-240v as well. Then you'd have an American PSU.