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Hirschmann BRS20-4TX/2FX-SM 942170-005 BOBCAT Managed Industrial Ethernet Switch
Managed industrial Fast Ethernet switch: 4 × 10/100Base-TX RJ45 and 2 × 100Base-FX single-mode SC. Fanless DIN-rail design with TSN, redundant power inputs, industrial protocols, and secure managed networking.
Long-Distance Managed Networking over Single-Mode Fiber
The Hirschmann BRS20-4TX/2FX-SM (part number 942170-005) is a managed industrial Fast Ethernet switch with 6 ports. It belongs to the BOBCAT series, and its time-sensitive networking capabilities support deterministic, real-time communication. The managed feature set also gives administrators control over traffic, redundancy, security, and diagnostics.
Four 10/100 RJ45 ports connect equipment at the local panel, while two fixed single-mode SC ports support fiber runs up to 32.5 km when the specified optical budget is met. This makes the switch a focused choice for connecting a remote process area or separate building where multimode reach would be insufficient and a field-installed SFP system is unnecessary.
🔌 Port Configuration
4 × 10/100Base-TX RJ45
2 × 100Base-FX single-mode SC
⏱️ TSN-Ready Platform
Supports time-sensitive industrial Ethernet traffic and precise network timing
⚡ Redundant DC Power
Two 12–24 V DC inputs; typical power consumption is 7 W
🛠️ Fanless DIN-Rail Design
No cooling fan to maintain; compact IP30 construction
Key Features & Benefits
- Managed Industrial Ethernet: VLAN, QoS, flow control, traffic shaping, jumbo frames, and multicast management help organize mixed automation traffic
- Resilient Network Options: HIPER-Ring, MRP, RSTP, link aggregation with LACP, link backup, and redundant network coupling support recovery planning
- Secure Access: IEC 62443-4-2-certified capabilities include 802.1X, RADIUS, access control lists, configurable password policies, audit trails, and HTTPS certificate management
- Multiple Management Paths: HTML5 management, CLI, SNMP v1/v2/v3, SSHv2, HTTPS, LLDP, TFTP, SFTP, SCP, and OPC UA provide flexible administration
- Industrial Protocol Profiles: Supports EtherNet/IP, IEC 61850, Modbus TCP, and PROFINET integration
- Precise Time Synchronization: PTPv2 transparent and boundary clock functions, IEEE 802.1AS, and SNTP support coordinated industrial communications
- Built-In Diagnostics: LEDs, signal contact, syslog, RMON, port mirroring, cable testing, link monitoring, and configuration checks improve troubleshooting visibility
- Local Service Interface: USB-C supports local management and device replacement workflows
- Panel-Friendly Power: Dual 12–24 V DC inputs and a plug-in signaling contact simplify industrial control-panel integration
- Manufacturer Guarantee: 5-year manufacturer's guarantee
⚠️ Match the Single-Mode Fiber and Optical Budget
The fixed SC ports are designed for 9/125 µm single-mode fiber and support a listed reach of up to 32.5 km under the stated 16 dB link-budget assumptions. Verify total path loss, splices, connectors, and reserve before treating the maximum distance as an installation guarantee.
🔐 Managed Security and Configuration
The BOBCAT management platform supports role-based administration, secure remote access, VLAN-based access restrictions, local and RADIUS authentication, configuration rollback, and backup to a remote server. Plan these settings before commissioning so the switch enters service with only the management paths and network access the application requires.
Technical Specifications
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Model
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BRS20-4TX/2FX-SM
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Part Number
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942170-005
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Series
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Hirschmann BOBCAT BRS20
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Switch Type
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Managed industrial Fast Ethernet switch
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Total Network Ports
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6
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Copper Interfaces
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4 × 10/100Base-TX RJ45
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Fiber / SFP Interfaces
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2 × 100Base-FX single-mode SC
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Fiber Distance
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Up to 32.5 km with 9/125 µm single-mode fiber
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Operating Voltage
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2 x 12 - 24V DC
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Power Consumption
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7 W
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Heat Dissipation
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24 BTU (IT)/h
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Power / Signal Contact
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1 plug-in terminal block, 6-pin
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Digital Input
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1 plug-in terminal block, 2-pin
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Local Management
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USB-C
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Copper Segment Length
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0-100 m
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Supported Topology
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any
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Operating Temperature
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0 C to +60 C (32 F to 140 F)
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Storage / Transport Temperature
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-40 C to +70 C (-40 F to 158 F)
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Relative Humidity
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1% to 95%
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MTBF at 25°C
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2638177 hours
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Dimensions (W × H × D)
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57 mm x 137.5 mm x 103.5 mm (2.24" x 5.41" x 4.07")
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Weight
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420 g
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Mounting
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DIN Rail
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Protection Class
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IP30
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Housing
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PC-ABS
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Approvals / Standards
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cUL 61010; CE, FCC, EN61131, EN62368-1
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Guarantee
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5-year manufacturer's guarantee
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Verify power, wiring, fiber, firmware, and environmental requirements against the BOBCAT manual before commissioning. Optical reach depends on the complete link budget and, for SFP models, the selected transceivers.
📋 Installation Overview
Before Commissioning:
1. Confirm the Environment: Check enclosure protection, clearances, and the 0 C to +60 C (32 F to 140 F) operating range
2. Mount the Switch: Secure the unit to a grounded DIN rail inside the control enclosure
3. Wire Power: Connect the 12–24 V DC supply inputs and signaling contact according to the manual
4. Connect Network Media: Use compatible 9/125 µm single-mode fiber with SC connectors
5. Apply a Base Configuration: Set management access, VLANs, redundancy, time synchronization, and industrial protocol profiles
6. Harden Access: Replace default credentials, limit management interfaces, and configure authentication and logging
7. Test the Network: Verify every link, alarm contact, redundant path, and required recovery behavior before production use
Installation and electrical work should be performed by qualified personnel in accordance with the BOBCAT manual and applicable codes.
📦 What's Included
Included with the Device:
• Hirschmann BRS20-4TX/2FX-SM switch (942170-005)
• Terminal block for supply voltage and signal contact
• Safety and general information sheet
Compatibility & Application Reference
Hirschmann BOBCAT Managed Switch Comparison
📄 Documentation & Support Resources
Hirschmann BRS BOBCAT Series Manual:
Managed Ethernet Switch Comparison: Compare Hirschmann managed industrial Ethernet switches
Local Management: USB-C supports local setup and device-replacement workflows; configuration can also be managed through the BOBCAT software interfaces
Part Number Note: Order Hirschmann BRS20-4TX/2FX-SM using part number 942170-005 (vendor part number 942170005). Confirm the required port media, operating range, and accessories before purchase.
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