How to wire a 4251?

Fire Alarm Help
1

Just got my 4251-20 today. I saw 4 terminals but how do I wire it to a 2 wire fire alarm

2

<URL url="How to wire a pull station to a horn/strobe text=“viewtopic.php?f=60&t=6312#p56918”>How to wire a pull station to a horn/strobe

1 Like
3

[quote=“electronicwiz101”]
<URL url="How to wire a pull station to a horn/strobe text=“viewtopic.php?f=60&t=6312#p56918”>How to wire a pull station to a horn/strobe]

I don’t know which terminals are + and -

4

[quote=“Niklaus”]

For what device?

1 Like
5

[quote=“Niklaus”]

On the pull station, the polarity doesn’t matter, meaning there is no + or -. The switch in the pull just creates a connection between the two terminals, numbers 1 and 2 on the rear terminal strip, when it is activated.

6

Going to beat Lambda to the punch by saying to check the voltage for ALL devices. Even though the 4251 is listed for 120VAC, it doesn’t hurt to be careful.

1 Like