Hirschmann BOBCAT BRS Switch Installation and Power Supply Guide

Hirschmann BOBCAT BRS series industrial switch engineering installation and power supply configuration complete solution

Introduction: A high-density and highly flexible platform for future industrial networks

With the increasing demand for network bandwidth, power supply capability, and environmental adaptability in intelligent manufacturing and process automation, Hirschmann has launched the BOBCAT BRS series industrial Ethernet switches, covering a wide range of models such as BRS20/22/30/32/40/42/50/52, supporting multi rate ports from 100M to 2.5G, PoE/PoE+power supply, redundant power input, and comprehensive explosion-proof certification. This series adopts a modular design, providing plastic or metal shells, narrow/medium/wide widths, and introducing USB-C configuration interfaces and digital inputs, providing highly reliable network nodes for fields such as rail transit, petrochemicals, smart grids, and ships. This article is based on the official installation manual, systematically sorting out the model decoding, power selection (T/F/U/P characteristics), installation grounding, SFP module derating rules, LED diagnosis, and initial safety configuration of BRS equipment, to assist engineers in quickly completing on-site deployment.

Chapter 1 Product Family and Model Decoding

1.1 Model coding rules

The BRS series models are composed of feature values from multiple locations, and the key field meanings are as follows (refer to Table 1 in the manual):

Data rate (position 4): 2=100M, 3=100/1000M, 4=1000M, 5=1000/2500M.

Hardware type (position 5): 1=Standard+MACSec, 2=PoE, 3=Standard+MACSec+PoE.

Number of ports (positions 7-8): For example, 04=4 10/100M ports, 08=8, 16=16, 20=20, 24=24.

Upstream port configuration (positions 9-14): Define additional high-speed ports or fiber/SFP slots, such as 2T=2 RJ45 Gigabit ports, OO=2 100/1000M SFP slots, 2Q=2 2.5G SFP slots, QT=2 2.5G RJ45 ports, M2=multimode DSC fiber, etc.

Temperature range (position 16): S or C=0 ° C~+60 ° C (standard), T, E or G=-40 ° C~+70 ° C (extended), where E/G has a three proof coating.

Power supply characteristics (position 17): T (12-24V DC), F (24-48V DC+24V AC), U (24V DC specifically for PoE), P (48/54V DC for PoE+).

Shell (position 18): C=plastic IP30, D=metal IP30, E=metal IP40.

Certification (positions 19-20): Includes options such as cUL, ATEX/IECEx, DNV, etc.

1.2 Shell size and installation space

The device provides three types of shells: narrow (about 47mm wide), medium (about 74mm), and wide (about 122mm wide), and the weight of the metal shell and plastic shell is different (see Table 12 in the manual). Key heat dissipation requirements: vertically installed on DIN rails, with a minimum gap of 5cm between ventilation holes and adjacent objects; If the gap decreases, it is necessary to reduce the rating according to Table 6 (such as reducing the temperature rating by 15K when the gap is 0cm). When used at high altitudes (>2000m), the ambient temperature should also be reduced accordingly (see Table 23 in the manual).

Chapter 2: Selection of Power Characteristics and Wiring Specifications

The BRS series offers four power supply characteristics (T/F/U/P), which engineers must choose correctly based on project power conditions and PoE requirements.

2.1 Characteristics T (12-24V DC)

Rated range: 12~24V DC, maximum allowable 9.6~32V DC.

Connection: 6-pin screw terminal, wire diameter 0.75~2.5mm ² (AWG18~12), torque 0.5Nm.

Backup fuse: Each input requires an external 2-10A slow melting fuse, I²t <1A²s。

Applicable: Non PoE devices, conventional industrial DC power supply.

2.2 Characteristics F (24~48V DC+24V AC)

DC range: 24~48V DC (allows 18~60V DC), AC range: 24V AC (allows 18~30V AC, 50~60Hz).

Attention: When powered by AC, the power supply must be isolated from ground potential, and the fuse must be suitable for AC.

Applicable: Supports both DC and AC hybrid power supply scenarios, but does not support PoE.

2.3 Characteristics U (24V DC designed specifically for PoE)

Rated voltage: 24V DC (allowing 18-30V DC).

PoE power: Maximum 90W (ambient temperature<60 ° C), reduced to 60W at 60 ° C~70 ° C (see Table 17 in the manual).

Wire diameter requirement: minimum 1mm ² (AWG16) to carry larger currents.

Fuse: External 10A slow melting, I²t <36A²s。

2.4 Characteristics P (48/54V DC for PoE+)

PoE mode: 48V (PoE) or 54V (PoE+), allowing 46-57V (PoE) or 52-57V (PoE+).

Non PoE mode: It can also be used as a regular 24-48V DC power supply (allowing 19-60V DC), but PoE cannot be output at this time.

Maximum PoE total power: 240W (metal shell) or 120W (plastic shell), and with temperature derating: reduced to 180W when ≥ 50 ° C~55 ° C, and reduced to 120W when ≥ 55 ° C~60 ° C (see Table 18 in the manual).

Insulation requirement: Must meet 2250V DC ground insulation withstand voltage (60 seconds).

Fuse: External 10A slow melting, I²t <25A²s。

Engineering key points: All features support redundant power supply (two-way input), internal diode decoupling, and automatic selection of higher voltage. If only a single channel is used, the device will trigger a power alarm, which can be resolved by configuring shielding or simultaneously connecting two channels.

Chapter 3 Installation and Grounding Standards

3.1 DIN rail installation

Hang the upper hook of the device onto the 35mm guide rail and press down until the lock buckle clicks into place.

When disassembling, insert a screwdriver horizontally into the bottom locking groove, pull down and flip up the device.

3.2 Functional Grounding

All models are equipped with independent grounding screws (as shown in Figure 12 of the manual), which must be connected to the system grounding bar using copper wires not smaller than the power wire diameter. Important: The grounding screw must be connected first and disconnected last, and the grounding wire diameter must be at least the same as the power supply wire (as required in the control diagram on page 14 of the manual).

3.3 Ferrite Accessories (Specific Models)

For 8-12 port models and DNV GL certified equipment, the accompanying ferrite should be placed on the power cord (near the input side of the equipment, at a distance of ≤ 5cm) and wound twice to suppress high-frequency interference and ensure EMC compliance. The characteristic P (PoE) model does not require ferrite.

Chapter 4 SFP Module Selection and Temperature Derating Rules

The BRS series supports Fast Ethernet, Gigabit Ethernet, 2.5 Gigabit, and bidirectional SFP transceivers, but requires the use of Hirschmann authentication modules (see Chapter 9 of the manual). Different modules have a derating effect on the operating temperature of the equipment, which must be accounted for during project design.

4.1 Reduction principle

For standard temperature (+60 ° C) equipment, if a module without the "EEC" suffix is used, the overall allowable ambient temperature of the equipment will be reduced by 15K (for example, if M-SFP-LX/LC has no EEC, the maximum operating temperature of the equipment will be reduced to 45 ° C).

Extended temperature (+70 ° C) devices typically require the use of modules with "EEC", otherwise the reduction is equally significant (see manual tables 35-39).

Some high-speed modules (such as M-SFP-2.5-LH/LC) may result in a 2K derating even when used in+70 ° C equipment (Table 37).

Selection suggestion: Priority should be given to wide temperature modules with the suffix "EEC" to ensure full performance of the equipment at extreme temperatures.

4.2 Fiber optic transmission distance

Tables 29 to 34 in the manual provide detailed information on the wavelength, fiber type, system attenuation, and corresponding maximum transmission distance (including 3dB system margin) for each module. For example:

Multi mode SFP (MM, 50/125 µ m, 1310nm): 0-5km.

Single mode (SM, 1310nm): 0-25km (standard), 25-65km (SM+), 47-104km (LH, 1550nm).

2.5G module: OM3 multi-mode can reach 550m, single-mode can reach 20km or 45km (SM+).

Mixing is strictly prohibited: LH only applies to LH, SM applies to SM, and MM applies to MM, otherwise the link will fail or the transceiver will be damaged.

Chapter 5 Display Elements and State Diagnosis

5.1 System LEDs (Power, Status, ACA, PoE)

Power (yellow/green): yellow=single power supply, green=dual normal, off=no power; Green flashing 4 times/second indicates that software update is in progress.

Status (green/red): Green=Device ready; Red=not ready; Red green alternating flashing=recovery mode.

ACA (green/yellow): Indicates the status of the USB-C configuration adapter (green=connected, yellow=not ready, flashing 3 times=read/write operation).

PoE (green/yellow): Green=PoE voltage is normal, yellow=power supply voltage is too low to support PoE.

5.2 Port LED (LS/DA)

LS (green): Always on=link valid; Slow flashing=port in Standby; Flash (3 times/cycle)=Port is managed to be closed or automatically disabled (due to error detection).

DA (yellow): flashing=data transmission and reception; Flash=The port is automatically disabled due to abnormal detection.

Start self check: After about 60 seconds of power on, each LED will light up in sequence. Wait for the Status green light to remain on, indicating that the system is operational.

Chapter 6: Digital Input and USB-C Management Interface

6.1 Digital Input (2-pin Terminal)

Used to connect digital sensors (such as door switches, temperature alarms), capture external signals, and trigger device actions.

Electrical parameters: Input voltage range -32~+32V DC, nominal+24V, high level (state "1") ≥+11V, low level (state "0") ≤+5V, maximum input current 15mA (see Table 22 in the manual).

Only some wide shell models have this interface (as indicated in Table 12).

6.2 USB-C interface (ACA22-USB-C)

Supports USB 2.0 master/slave mode, used to connect AutoConfiguration Adapter (ACA22) for configuration backup/restore and software upgrade.

Usage restrictions in explosion-proof areas: In hazardous environments, only ACA22-USB-C (EEC) with mechanical locking can be used, and insertion and removal must be carried out in a power-off state (emphasized in multiple places on pages 13-18 of the manual).

USB cable is only for configuration and cannot be connected for a long time (except in non explosion proof areas).

Chapter 7 Compliance Operation of Explosion proof Zone (Class I Division 2/ATEX)

BRS equipment has passed ATEX, IECEx, and UL Class I Div 2 certifications and is suitable for Zone 2/Div 2 areas with flammable gas environments. The following mandatory regulations must be followed:

Temperature level T4: Standard type (S/C) ambient temperature 0~+60 ° C; Extended type (T/E/G) -40~+70 ° C.

Shell protection: The device is open type and must be installed in a cabinet with an IP54 rating or higher, and can only be opened with tools.

Non flammable on-site wiring parameters: relay contact parameters Vmax=30V, Imax=90mA, Ci=2nF, Li=1 μ H (control diagram). On site wiring must comply with NEC Article 501.

No live plugging and unplugging: All connectors (RJ45, SFP, DSC, USB) must be plugged and unplugged in a power-off or non explosive gas environment.

Replacement parts warning: Using non certified SFP or replacing internal components will compromise explosion-proof applicability.

Chapter 8 Initial Configuration and Password Mandatory Change

8.1 IP address acquisition method

DHCP is enabled by default when the device leaves the factory, and can also be configured through the following methods:

HiView/Industrial HiVision (graphical tool)

BOOTP/DHCP Option 82

USB-C adapter (ACA22) auto loading configuration

Directly connected via USB-C interface (driver required)

8.2 Mandatory Password Change (Security Baseline)

Starting from software version 08.7.0, the default password "private" must be changed for the first login, otherwise the management interface cannot be accessed. Operation steps:

Log in through Web/GUI/CLI (username "admin", password "private").

The system requires the input of a new password (at least 8 characters, including uppercase and lowercase letters, numbers, and special symbols).

Confirm the new password and log in again.

If the password is lost, the factory settings can be reset through System Monitor (connected to V.24 or USB) (see page 60 of the manual for details).

Chapter 9 Electromagnetic Compatibility and Installation Techniques

For copper cable transmission of gigabit and above, shielded twisted pair cables (Cat5e or higher) must be used to meet the requirements of EN 50121-4 railway and ship applications.

Power and data cables should be laid separately to avoid parallel long-distance wiring; If unavoidable, maintain a 90 degree cross.

Ferrite is installed on the input side of the power supply according to the requirements of section 3.3 to suppress radiation emission.

The equipment meets both EN 61000-6-2 (industrial immunity) and FCC Class A (commercial environment) standards.