Hirschmann BRS20-12009999-TTCY99HHSESXX.X.XX brings twelve managed RJ45 ports to installations requiring −40 to +70 °C operation
The Hirschmann BRS20-12TX-EEC is a fanless managed Fast Ethernet switch for DIN rail mounting. The complete keyword and ordering reference is Hirschmann BRS20-12009999-TTCY99HHSESXX.X.XX; the associated part number is 942170074. Its documented operating temperature range is −40 to +70 °C, making temperature requirements a key selection difference from the standard BRS20-12TX version.
Start with the installation environment
Evaluate the temperature at the switch location inside the enclosure, including the effect of nearby power supplies and other equipment. The broader operating range of this EEC configuration supports applications with greater temperature variation. Its PC-ABS housing has an IP30 protection rating, so the temperature specification does not make it a weatherproof or washdown enclosure. Cabinet protection and installation arrangements remain part of the overall design.
Twelve copper connections and local access
All twelve network ports are 10/100BASE-TX RJ45 interfaces. The published twisted-pair link distance is up to 100 m. A six-pin plug-in terminal block serves the power supply and signaling contact, while USB-C is provided for local management and device replacement. The supply rating is 2 × 12–24 V DC and the listed power consumption is 9 W. These values provide a practical starting point for the cabinet power budget.
Hirschmann product reference image. The pictured model may differ from the specified configuration.
Technical specifications
| Brand | Hirschmann |
|---|---|
| Catalog Type | BRS20-12TX-EEC |
| Product code | BRS20-12009999-TTCY99HHSESXX.X.XX |
| Part Number | 942170074 |
| Port Type and Quantity | 12 Ports in total: 12x 10/100BASE TX / RJ45 |
| Operating Voltage | 2 x 12 VDC ... 24 VDC |
| Power Consumption | 9 W |
| Operating temperature | -40-+70 °C |
| Housing | PC-ABS |
| Mount Type | DIN Rail |
| IP Protection Rating | IP30 |
Maintain visibility when conditions change
Hirschmann BRS20-12009999-TTCY99HHSESXX.X.XX supports managed functions including VLANs, traffic prioritization and IGMP snooping. RSTP, MRP and HIPER-Ring are listed among its redundancy capabilities. Diagnostic functions include port mirroring, copper cable testing, link monitoring and event logging through Syslog. During commissioning, establish a configuration backup and record the selected redundancy method so that maintenance personnel can identify the intended network behavior.
Identify the EEC version on the inquiry
Use the complete Product code rather than the BRS20 family name when requesting availability. State part number 942170074, the quantity and the required operating conditions. For a replacement, compare the installed unit’s full label and configuration record with Hirschmann BRS20-12009999-TTCY99HHSESXX.X.XX; a matching port count alone does not establish an exact configuration match.
Temperature range and enclosure protection answer different questions
The extended operating range is an important reason to specify Hirschmann BRS20-12009999-TTCY99HHSESXX.X.XX, but the switch temperature should be assessed at its installed location. A cabinet can be warmer than the surrounding room because of heat released by other components. Conversely, an unheated enclosure may experience a low starting temperature before the equipment reaches normal operating conditions. Review those conditions with the enclosure design and the environmental requirements of the whole panel. The documented 9 W consumption is also useful when preparing the electrical and thermal budget.
Ingress protection is a separate consideration. The IP30 housing needs an installation environment that provides suitable protection from water, dust exposure and other site conditions. Cable entries, enclosure seals and the placement of nearby equipment are installation decisions; an EEC suffix does not determine them. This distinction helps avoid selecting a wide-temperature switch and then overlooking the protection required around it.
Prepare maintenance records for the exact EEC configuration
For a replacement request, record the full Product code, part number, network role and the configuration that must be restored. A photograph of the installed label can help procurement distinguish this version from other twelve-port switches, while the approved network drawing identifies how it is connected. Record whether the installation uses a line, star or redundant topology and note the management and VLAN settings. These details are more useful than a request that states only the BOBCAT family name.
After commissioning, keep the saved configuration with the device record and document any site-specific settings. A maintenance check can then compare current link indications, event logs and port configuration with the original baseline. When ordering Hirschmann BRS20-12009999-TTCY99HHSESXX.X.XX, list required accessories separately and confirm the offered supply scope. USB-C local management is documented, but cables and configuration adapters should be identified explicitly if they are needed for the service procedure.
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