Would a splitter like this create voltage issues if you are sharing the line for a fire alarm and regular phone calls?

There would not be voltage issues. The more important problem would be if the fire alarm tried to call in an alarm while the phone line was in use on a regular call. The alarm would not go through.

Does this have 6 pins on the input and both outputs?

The outlet that is single,has 6 pins the side that has two outlets has 3pins each

Can I put one ethernet in and connect two different devices to the other out ethernets?

Dear friend, I am sorry that this one is only for Telephone. Both side are Telephone RJ12 6P6C. Ethernet is for RJ45 8P8C.

Does it split 2 lines from wall plug to 2 separate lines?

No, same connection, you can just have two phones connected at the same time. Thats all.

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RJ12 6P6C 3 Female Telephone Splitter Adapter Cable (Black)

Product ID: 276508355

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Details

Compatible devices
telephone
Specific uses for product
Telephone
Connector type
RJ11
Colour
Black
Brand
S-MITON

🔀3 female ports for multi-line use

🔌6P6C RJ12 connectivity

🖤Sleek black compact design

Description

🔌 Connect More, Stress Less – The Ultimate RJ12 Splitter!

DURABLE BUILD - Sturdy construction ensures reliable, long-lasting performance
SPACE SAVING DESIGN - Compact black adapter fits neatly in any setup without clutter
PLUG PLAY CONVENIENCE - No drivers or software needed—just connect and go
TRIPLE CONNECTION POWER - Split one RJ12 line into three female ports effortlessly
UNIVERSAL COMPATIBILITY - Works seamlessly with RJ11 and RJ12 devices for versatile use

The RJ12 6P6C 3 Female Telephone Splitter Adapter Cable in black offers a compact, durable solution to expand a single RJ12 line into three female ports. Compatible with both RJ11 and RJ12 devices, it enables seamless multi-line connectivity without extra software, making it an essential tool for efficient telecommunication setups.

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