does this provide 30W per port i.e total 120W at a time?

Yes, you get the full PoE+ 802.3at voltage across all 4 ports simultaneously.

I need to power a wireless access point that draws 12V and 1 amp. Will the injector output damage the access point?

Dear K! Thanks for your interest in TRENDnet! Our TRENDnet PoE Injector and meets the PoE standards listed below. 802.3af – PoE 15.4 watts 802.3at – PoE+ 30 watts In order for other devices to be powered by our injectors. The devices must also meet one of these standards in order to get power. These standard are also called active PoE because the voltage will change in the device being powered in the range of voltage PoE provided in the standard. Hope this helps! If you have any more questions, you can always respond directly to this thread and someone will be happy to try and help answer any additional questions you may have! Have a great day! Adrian TRENDnet CS

Will this work with 12v Cameras and if not do you have one that will?

Only if your camera is a POE/POE+ rated unit. If not you need a 12v power supply

I have 3 access points devices [ 2 x 24v , 1 x 48v ] will be ok with this injector?.

Dear Konstantinakos! Thanks for your interest in TRENDnet! TRENDnet PoE Injectors and switches meets some or all the PoE standards listed below. 802.3af – PoE 15.4 watts 802.3at – PoE+ 30 watts 802.3bt – PoE++ or 4PPoE 60 – 100 watts In order for other devices to be powered by our switches or injectors. The devices must also meet one of these standards in order to get power. These standards are also called active PoE because the voltage will change in the device being powered in the range of voltage PoE provided in the standard. Passive PoE devices are a set voltage in PoE. This is not the voltage a camera, phone, access point, etc. get from the power adaptor. (Example: TRENDnet sell cameras that use a 12v power adaptor, but those cameras are also PoE standard.) It is a set voltage from the PoE, if this is the case TRENDnet injectors or switches will not work. (Exception of our point-to-point access points). Typically, if someone ask for something like 24v or 48v of PoE it’s a passive device. Hope this helps! If you have any more questions, you can always respond directly to this thread, and someone will be happy to try and help answer any additional questions you may have! Have a great day! Adrian TRENDnet CS

Switch type	PoE Switch
Product dimensions	12.7L x 7.4W x 3.2H centimeters
Item weight	907 Grams
Platform	Not Machine Specific
Voltage	220 Volts
Case material type	Metal
Lower temperature rating	32 Degrees Fahrenheit
Maximum power	30 Watts
Upper temperature rating	104 Degrees Fahrenheit
Interface type	PoE+, RJ45
Data transfer rate	1E+3 Megabits Per Second
Manufacturer	TRENDnet
UPC	710931161724
Color	Black
Size	4 Port Gigabit PoE+
Style	Injector
Material Type	tpe
Number of Items	1
Usage	Personal
Wattage	65 watts
Batteries Included?	No
Language	English, English, English, English, English
Item model number	TPE-147GI
ASIN	B085Z6BYNV

Trendnet65W 4-Port Gigabit PoE+ Injector

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