Series One or Series Two
All F300A or F300E should use Series Two. All F50F F58F should use the Series Two power box unless you have the W8600E remote indicator.
The remote indicator is optional. It primarily provides the same function as the neon lamp. Ideal for installations where the unit is not seen or heard.
If you have the early W8600E indicator shown top-left, then you need the Series One power box. The Series One power box has additional circuitry for this indicator.
If you have the newest W8600F indicator, then use the Series Two power box. The Series One power box is also compatible with the W8600F when the W8600E circuitry is removed.
If you do not have either remote indicator, choose the Series Two power box. The Series One power box would be compatible but has unnecessary W8600E circuitry.
The W8600F was introduced in 1998 and was originally available in white or taupe, but the taupe was discontinued mid 2006. The W8600F is now only available in white.
Though the W8600E was replaced by the W8600F in 1998, the W8600E was available as a replacement part until 2004. We no longer have any W8600E left.