Step 1. Answer the questions below regarding your upgrade needs
| Wye or Delta | |
| Need two RS485 ports? | |
| Need RS485 baud rate 4800bps or lower? | |
| Need ANSI 21 Distance element? | |
| If power supply is HI-volt AC, need less than 88VAC? | |
| If power supply is LO-volt, is AC voltage required? | |
| Any 489 Mods installed? | |
| Need without case? | |
| Need Digital Input +24Vdc Switch Supply? | |