General
Number of RJ45 ports	6
Number of fibre optic ports	2
Fibre optic connector type	ST
Packet buffer	768 kbit
MTBF	3.248.014 Stunden
Overcurrent protection

The Moxa EDS-208A-MM-ST is an unmanaged Industrial Ethernet-Switch with 8 ports, specifically developed for use in harsh industrial environments. The device features 6 RJ45 ports for 10/100BaseT(X) and two multimode fibre optic connections with ST connectors for 100BaseFX. It is designed for applications in transport, energy supply, marine technology, and hazardous areas where high reliability and safety are required. The protection rating IP30 and the robust aluminium housing ensure reliable operation under industrial conditions. The switches are equipped with a redundant power supply supporting voltages from 9.6 to 60 VDC, including standards 12/24/48 VDC, and feature reverse polarity and overcurrent protection. Power supply is via a 4-pole removable screw terminal.

Applications include industrial automation networks, particularly in environments with high mechanical and electrical stress. The operating temperature of the -T model ranges from -40 to 75 °C, enabling use in extreme climatic conditions. Storage temperature is -40 to 85 °C, and humidity is between 5 and 95 % (non-condensing). The certifications include safety standards such as UL 508 and EN 62368-1, EMC standard EN 55032/35, and immunity standards according to IEC 61000-4-2 to -4-8. Additionally, the device meets requirements under ATEX, Class I Div. 2, DNV/LR/ABS/NK, NEMA TS2, and EN 50121-4, confirming suitability for hazardous areas.

Functions and equipment in detail include a MAC table with 2,048 entries and a packet buffer of 768 kbit. Switching is performed using the Store-and-Forward method, enabling full packet inspection before forwarding. The support for PROFINET Conformance Class A1 makes the switch suitable for industrial communication applications. DIP switches allow activation of broadcast storm protection to prevent network overloads. The dimensions are 50 × 114 × 70 mm, and the weight is 275 g. Mounting is standard on DIN rail, with optional wall mounting available.

Technology explained simply shows that the fibre optic connections (100BaseFX) are suitable for longer transmission distances, especially in environments where copper cables could be affected by electromagnetic interference. Multimode technology is designed for medium distances and offers a cost-effective alternative to single-mode connections. The redundant power supply increases network availability, as in the event of failure of one power source, the other continues to supply power. The MTBF (mean time between failures) is up to 3,248,014 hours, highlighting the high reliability of the device.

Compatibility and accessories include optionally available power supplies such as DR-120-24, DR-75-24, or MDR-40-24, which can be used for external power supply. For wall mounting, the set WK-46-01 is available, and for rack mounting, the kit RK-4U is available. These accessories extend the mounting flexibility of the switch.

Mounting and installation are simple on DIN rail. The power supply screw terminals are removable, facilitating installation and maintenance. The quick start guide included in the delivery supports setup.

Operational advantages lie in high operational reliability, resistance to environmental influences, and support for industrial protocols. The combination of robust design, wide temperature range, and redundant power supply system makes the EDS-208A-MM-ST a reliable component in critical networks. The ATEX certification and Class I Div. 2 enable use in explosive environments, which is relevant in process industries and mining. The PROFINET support ensures integration into modern automation architectures.

The delivery includes the EDS-208A switch, a quick start guide, and a warranty card.