The Bosch LBB1957/00 Plena Voice Alarm Keypad is a professional zone expansion keypad designed to work seamlessly with the Plena Voice Alarm Call Station. It allows users to expand zone selection capacity by adding 7 additional zone buttons, making it ideal for large multi-zone public address and emergency evacuation systems .Built for life-safety and voice alarm applications, this keypad is EN 54-16 and EN 60849 compliant, ensuring reliable operation during emergency announcements. With clear LED zone indicators, operators can instantly identify active zones, improving control and response during critical situations. What is the main purpose of the Bosch LBB1957/00? A-1 It is used to expand zone selection on Bosch Plena voice alarm call stations by adding extra zone buttons. How many zones can be added using this keypad? A-2 Each keypad adds 7 zones, and up to 8 keypads can be connected for large systems. Is this keypad suitable for emergency evacuation systems in India? A-3 Yes. It is EN 54-16 certified, making it suitable for fire alarm and evacuation systems commonly used in India. Does it work independently? A-4 No. It works as an extension and must be connected to a Bosch LBB1956/00 call station. Where is this product commonly used? A-5 Airports, malls, hospitals, factories, railway stations, hotels, schools, and large commercial buildings. Specifications Product Type Voice Alarm Call Station Keypad (extension for Plena systems) Function Adds 7 additional zone-select keys to the main call station Power Supply 24 V DC (supplied by LBB1956/00 call station) Current Consumption < 15 mA Zone Keys 7 zone selection keys LED Indicators LED indicators for each zone Expandable Keypads Up to 8 keypads can be connected together Base Dimensions (H × W × D) 40 × 100 × 235 mm Weight Approx. 1 kg Mounting Bracket-coupled with LBB1956/00 or another LBB1957/00 unit Color Charcoal with silver accents Interconnections 2 × RJ45 jacks, 24 V DC input, keypad connector Operating Temperature −10 °C to 45 °C Storage Temperature −40 °C to 70 °C Relative Humidity < 95 % non-condensing Certifications EN 54-16 and EN 60849 compliant
