IS420ESWAH3A - IONet Ethernet Switch

IS420ESWAH3A - IONet Ethernet Switch IS420ESWAH3A - IONet Ethernet Switch

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Part Number: IS420ESWAH3A
Manufacturer: General Electric
Country of Manufacture: United States
Series: Mark VIe
Function: Ethernet Switch

IS420ESWAH3A is an IONet Ethernet Switch developed by GE and is part of the General Electric Speedtronic Mark VIe gas turbine control systems. It uses Achilles-certified controllers and current Fieldbus technology to meet NERC version 5 Protection Reliability Standards for Critical Infrastructure. The component has eight ports with 10/100BASE-TX capability. It's one of numerous Ethernet switch models available for use with the Mark VIe system. It features a conformal coating and is suitable for usage in hazardous environments. The machine can function in temperatures ranging from -40 to 158 degrees Fahrenheit.

IS420ESWAH3A Features

  • Compatibility with 802.3, 802.3u, and 802.3x
  • 10/100 base copper with auto-negotiation
  • Full/half duplex auto-negotiation
  • 100 Mbps FX uplink port
  • HP-MDIX auto-sensing
  • Link Presence, Activity, Duplex, and Speed per port LEDs (each LED has two colors)
  • Power LED
  • 256 KB buffer with 4K media access control (MAC) addresses

Flow Control

Flow control between switches is supported by the switch. It receives and honors pause packets using IEEE defined pause packets. The switch only sends pause packets if a port requires flow control.

IONet Ethernet Switch Reliability and Performance

Because high reliability is critical in the controls solutions industry, the switch has a Mean Time Between Failure (MTBF) of more than 4 million hours at 35°C (95 °F) ambient temperature, ground fixed controlled environment.

Product Attributes


  • The switch enclosure can be panel mounted (the switch is bracket mounted to the back wall of the panel) or DIN-rail mounted.
  • DIN-rail mounting satisfies vibration and shock requirements.
  • Both mounting types allow for easy access to user connections.

138 x 86 x 56 mm (5.45 x 3.40 x 2.20 in)

Power connection
Supports two redundant diode-OR’d power supply inputs of 18 to 36 V dc

Convection cooled when mounted vertically or horizontally

Resistant to corrosion with provisions made for grounding per IEC 60721-3-3 Class 3C2

Operating temperature
-30 to 65°C (-22 to 149 °F)

Shipping, storage temperature
-40 to 85°C (-40 to 185 °F)

Operates in a 5 to 95% relative humidity, non-condensing environment without any external temperature or humidity excursions

Seismic Vibration
Meets Universal Building Code (UBC)


Link presence, activity and duplex, and port speed LEDs have two colors that indicate their status.

LED One 

  • Full Duplex activity is indicated by a green flash.
  • Yellow flashes for activity at Half Duplex

LED Two 

  • Green indicates a link and 100 Mb.
  • Yellow indicates a link and 10 Mb.
  • No link = no led lit

IS420ESWAH3A Benefits

  • Longer availability of parts for future network expansion
  • Backward compatibility with legacy systems
  • Improved performance for real-time control systems

IS420ESWAH3A Conformance Criteria

IEEE 1588 timing can be used to synchronize packet traffic and trigger it to begin within a 1-microsecond packet start window. The following four criteria are used to assess capability and conformance:

  • Starting the required Multicast packet load on a single port without negotiating IEEE 802.3x flow control
  • Begin the required Multicast packet load on a single port, with IEEE 802.3x flow control negotiated
  • Initiation of the required Multicast packet load distributed across all ports, with no IEEE 802.3x flow control.
  • Start the required packet Multicast load across all ports; packet count per port must average 200 per number of switch ports, with IEEE 802.3x flow control negotiated on half of the ports.

WOC has the largest stock of Speedtronic Mark VIe control sparesWOC is happy to assist you with any of your automation requirements. Please contact our staff by phone or email for pricing and availability on any parts and repairs.




What is IS420ESWAH3A?

IS420ESWAH3A is an IONet Ethernet Switch used in GE Speedtronic Mark VIe gas turbine control systems.

IS420ESWAH3A is installed where?

The IS420ESWAH3A is often mounted on a DIN-rail.