modem-router ac adapter

[bep1995]

Good evening, I have the TP-Link W8961N V3 modem-router and it's ac adapter says 12V 1A and I want to ask if I use an ac adapter from another modem-router (Huawei DG8245v) which is 12v 1.5A will it work properly or it will catch fire ?? And if it does work then can I do the opposite, use the tp-link ac adapter on huawei modem-router ?? Thanks in advance !!

[OhioYJ]

Why change adapters if you have the correct one? However, don't do the opposite. If the polarity is the same, then yes. As long as the adapter puts out the same or is capable of putting out more current it should be fine to use on that device. It should put out the amount of voltage listed, but it will only output the amount of current needed. So more powerful is generally ok. Not enough current is not ok. That is why trying to use your 1 amp adapter on a device that could draw 1.5 amps is not ok.

[bep1995]

I want to use the huawei adapter on the tp-link router because of its shape, it does fit more nicely on the power strip. The tp-link adapter its like THIS and the huawei like THIS. Both are 12v and the connectors on both are physically the same. My concern is if there is a problem if the ac adapter have more ampere "0.5 in this case" than the router is rated for.

[Biohazard777]

10 minutes ago, bep1995 said:

My concern is if there is a problem if the ac adapter have more ampere "0.5 in this case" than the router is rated for.

@OhioYJalready covered that. No it isn't a problem.
- Voltage must be equal.
- Current (amps) must be at least as the original adapter (1A) or more.
A few examples, your  power adapter is 12V 1A, replacement adapters:

• 9V 1A = BAD
• 15V 1A = BAD
• 12V 0.5A = BAD
• 12V 1A = GOOD
• 12V 2A = GOOD
• 12V  400A = GOOD (that would be one very expensive power adapter, but it would work perfectly fine)

 

14 minutes ago, bep1995 said:

Connectors on both are physically the same.

Even if they look physically the same, you should check polarity. Usually the inside is + and the outside is -.

Simplest way to check is to look for these symbols on both of the adapters, they should have the same one (either left or right):

If you can't find these markings / label, another way to check is to use a multimeter. put the red probe inside and the balck outside

if the meter shows 12V than that is it, you've confirmed that the core of the barrel connector is +,
but if it shows -12V that means the core is actually  -.

Both power adapters should have the same polarity.
You got it now? 

[bep1995]

@Biohazard777 both adapters have the positive polarity symbol. if i'm right the conclusion is: same voltage same polarity and same or higher amperes, so i'm good to go, right ?? 

[Biohazard777]

Just now, bep1995 said:

@Biohazard777 both adapters have the positive polarity symbol. if i'm right the conclusion is: same voltage same polarity and same or higher amperes, so i'm good to go, right ?? 

Yep 

[bep1995]

@Biohazard777 ok !! thank you very very much !! it's all clear now !! 

[Blue4130]

11 hours ago, Biohazard777 said:

@OhioYJalready covered that. No it isn't a problem.
- Voltage must be equal.
- Current (amps) must be at least as the original adapter (1A) or more.
A few examples, your  power adapter is 12V 1A, replacement adapters:

• 9V 1A = BAD
• 15V 1A = BAD
• 12V 0.5A = BAD
• 12V 1A = GOOD
• 12V 2A = GOOD
• 12V  400A = GOOD (that would be one very expensive power adapter, but it would work perfectly fine)

 

Rather than checking the adapter, check the device itself. Many will require less that the adapter so a lesser amperage than the original adapter would be fine. And some devices will accept a range of voltage. All of this information is on the device, not the adapter. 

[Biohazard777]

1 hour ago, Blue4130 said:

Rather than checking the adapter, check the device itself. Many will require less that the adapter so a lesser amperage than the original adapter would be fine. And some devices will accept a range of voltage. All of this information is on the device, not the adapter. 

All true, but some devices don't have this information on them.
USB Hubs come to mind, like the LC-HUB-ALU-2B-7 I have on my desk:

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