FireShield is available in three models: three-zone, five-zone, and ten-zone. Each model is similar except for the number of initiating device circuits (IDCs) and notification appliance circuits (NACs). Model numbers may have the following suffixes: G or R indicates gray or red enclosure, GD or RD indicates panel with FSDACT, GC indicates ULC panel with terminal shield, GF indicates a French ULC panel with terminal shield, and G-2 indicates 230 Vac input. Each panel is configured for Class B operation. All models except for the three-zone can be easily converted to Class A by using two Class B circuits to make one Class A circuit.