Bosch LBB1957/00 voice alarm keypad

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Zone expansion keypad for Bosch Plena voice alarm systems
Adds 7 additional zone selection buttons to the main call station
Designed for use with Bosch LBB1956/00 call station
EN 54-16 and EN 60849 certified for emergency applications
LED indicators for clear zone status visibility
Supports connection of up to 8 expansion keypads
Low power consumption with 24 V DC operation
Compact design for neat and professional installation

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Description
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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