Bosch LSN 0300 A – 300mA LSN Bus Module for Fire Alarm Systems
The Bosch LSN 0300 A is an addressable fire alarm system bus module designed for connecting up to 254 LSN improved elements or 127 classic LSN elements. It supports a maximum line current of 300 mA, line lengths up to 1600 m, and flexible loop, stub, and T-tap network structures for compatible Bosch fire detection systems.
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Bosch LSN 0300 A – 300mA LSN Bus Module for Fire Alarm Systems
The Bosch LSN 0300 A is an LSN bus module designed to connect addressable fire alarm devices to compatible Bosch fire detection systems. It supports up to 254 LSN improved elements or 127 classic LSN elements, with a maximum line current of 300 mA.
The module provides flexible network configuration options, including loop, stub, and T-tap structures. It is suitable for fire alarm installations requiring addressable device connectivity and auxiliary power supply connections.
Key features
- Supports up to 254 LSN improved elements.
- Supports up to 127 classic LSN elements.
- Maximum LSN line current of 300 mA.
- Line length up to 1600 m, depending on configuration and cable type.
- Unshielded cable can be used.
- Flexible loop, stub, and T-tap network structures.
- Supports LSN improved automatic addressing, LSN classic automatic addressing, and manual address assignment.
- Two auxiliary power supply connections.
- Compact ABS plastic housing with red alarm and yellow fault LED indicators.
Addressable fire alarm connectivity
The LSN 0300 A allows the connection of an LSN loop with up to 254 LSN improved elements or 127 classic LSN elements. It provides a maximum line current of 300 mA for the connected LSN devices.
The module supports addressable fire alarm device connectivity and auxiliary power distribution for compatible Bosch fire detection systems.
Flexible network structures
The module supports loop, stub, and T-tap network configurations. The maximum line length is up to 1600 m, depending on the system configuration and cable type.
For operation of the fire detection system according to EN 54-13, every stub and T-tap must be terminated with appropriate end-of-line modules.
Installation and configuration
The LSN 0300 A is designed for installation in a compatible Bosch fire alarm system. Current consumption of connected devices and cable length can be calculated using the Safety Systems Designer (SSD).
Country-specific standards and guidelines must be considered during system planning and installation.
Applications
The Bosch LSN 0300 A is suitable for compatible addressable fire alarm systems requiring LSN bus connectivity, auxiliary power connections, and flexible network structures.
Manufacturer: Bosch Security Systems
Model: LSN 0300 A
Product type: LSN bus module, 300 mA
Source: Bosch LSN 0300 A manufacturer datasheet, June 24, 2021.
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Bosch LSN 0300 A – Technical Specifications
Brand: Bosch
Model: LSN 0300 A
Product Type: LSN Bus Module, 300mA
Order Number: 4.998.137.277
Key Features
- Supports up to 254 LSN improved elements or 127 classic LSN elements.
- Maximum LSN line current of 300mA.
- Maximum line length up to 1600 metres, depending on configuration and cable type.
- Supports flexible loop, stub and T-tap network configurations.
- Supports LSN improved automatic addressing, LSN classic automatic addressing and manual address assignment.
- Supports the use of unshielded cables.
- Integrated LED indicators for alarm and fault monitoring.
Electrical Specifications
| Parameter | Specification |
|---|---|
| Input Voltage | 20–30 V DC / 5 V DC ±5% |
| LSN Output Voltage | 30 V DC ±1.0 V |
| Auxiliary Output Voltage | 28 V DC ±1.0 V |
| Maximum Current Consumption | 1750mA at 24 V DC |
| Nominal Module Current | 39mA at 24 V DC |
| LSN Line Current | Maximum 300mA |
| Auxiliary Power | Maximum 2 × 500mA at 28 V DC |
| LSN Current Calculation | 1.7 × LSN element current consumption |
| AUX Current Calculation | 1.2 × auxiliary power |
System Capacity
| Parameter | Specification |
|---|---|
| LSN Improved Elements | Maximum 254 |
| Classic LSN Elements | Maximum 127 |
| Maximum Line Length | 1600m |
| Network Topology | Loop, Stub, T-tap |
| Addressing | Automatic and Manual |
Mechanical Specifications
| Parameter | Specification |
|---|---|
| Housing Material | ABS Plastic (UL94 V-0) |
| Housing Colour | Anthracite, RAL 7016 |
| Dimensions | 127 × 96 × 60 mm (approx.) |
| Weight | 225 g (approx.) |
| Alarm Indicator | Red LED |
| Fault Indicator | Yellow LED |
| Test Function | LED Test Button |
Environmental Specifications
| Parameter | Specification |
|---|---|
| Operating Temperature | -5°C to +50°C |
| Storage Temperature | -20°C to +60°C |
| Relative Humidity | Up to 95%, non-condensing |
| Protection Rating | IP30 (IEC 60529) |
Installation Notes
- LSN device current consumption and cable length can be calculated using Bosch Safety Systems Designer (SSD).
- Installation must comply with applicable country-specific standards.
- For EN 54-13 operation, each stub and T-tap must be terminated with an appropriate EOL module.
Compatible Accessory Listed in Datasheet:
FLM-420-EOL2W-W – End-of-Line Module, 2-wire LSN wall-mount.
Manufacturer: Bosch Security Systems
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