Hi, does anyone know what I can use as a replacement/upgrade to these old simplex bells please?
If they are just 24vdc bells, most modern horns (and horn-strobes if they aren’t on a coded circuit) can replace them.
Yep, 4080 is 24 VDC. What’s the panel, and the use case?
If the bell is used on a standard alarm circuit (AKA not used for waterflow or something like that) then almost any horn strobe will work, but if possible to use something that better pairs with the panel.