Additional 32 zone BUS expander module for LightSYS™ and ProSYS™ / ProSYS™ Plus main panels. EN50131 GRADE 3 certificate. Each BUS zone expander creates a separate BUS branch. Each expander can be configured to support 8, 16, 24 or 32 detectors in BUS. The BUS branch increases the total security of the system in case a certain BUS detector is sabotaged. It has the function of isolator and concentrator. The RISCO™ BUS detectors allow its remote adjustment. Connection to BUS. Max. distance: 300m. Consumption: 20mA (typical).