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SFNT series Unmanaged Switches

Two Unmanaged Switches in the SFNB series mounted on a DIN rail

The SFNT features special extensions for demanding applications for Unmanaged Switches such as those in the process industry and maritime applications. The switches are particularly robust with respect to harsh ambient conditions. These switches are approved for specific industries which is advantageous as this is a prerequisite for many users.

Optimized for use in the process industry

Refinery pipelines  

SFNT Unmanaged Switches are suitable for use in processing plants

The SFNT series of Unmanaged Switches are optimized for use in the process industry. Thanks to the wide temperature range of ​-40°C to +75°C and the industry-specific ​ATEX​, ​IECEx​, and ​UL​ ​Class​ 1 ​Div​ 2 approvals, they are ideally suited for the harsh ambient conditions in this industry.

Conformal coating for particularly harsh environments

The SFNT range of Unmanaged Switches includes special versions that provide a high level of protection against external influences, such as high levels of humidity, dust and chemicals. The electronics components on the PCB in these versions with the additional "C" designation (which stands for conformal coating) are coated after assembly with a layer of protective lacquer for protection. Thus, the risk of damage or failures due to ambient conditions is minimized.

Simple error diagnostics

Alarm LED on the switch  

SFNT Unmanaged Switches indicate errors via an LED on the device

Error state diagnostics can only be performed with Managed Switches. However, the SFNT series of Unmanaged Switches also support basic mechanisms for the detection of errors. With the aid of a signal contact, problems with the power supply and link interruptions on the individual ports are transmitted to a controller, for example. The monitoring ports can be easily configured at the device via DIP switches.

Overview of FL SWITCH SFNT

Transmission speed

10/100 Mbps

Power supply

9 ... 32 V DC, redundant

12 ... 48 V DC*, redundant

Temperature range

-40°C … +75°C

Degree of protectionIP20
Special featuresQoS, signal contact, conformal coating*




* In selected models

Click here to view the product list of Unmanaged Switches in the SFNT series.


C6 The Exchange
Calmount Park
Dublin 12
D12 XE18