Product Core Brief

• Model: IS420ESWBH2A
• Brand: General Electric (GE)
• Series: Mark VIe / Mark VIeS
• Core Function: Provides non-managed IONet and industrial Ethernet switching with fiber/copper connectivity for turbine and safety control networks.
• Product Type: ESWB Industrial Ethernet / IONet Switch
• Key Specs: 8× 10/100/1000BASE-T RJ45 + 2× 100Base-FX multi-mode fiber (LC) | 16 Gbps switching capacity | 11.9 Mpps forwarding rate | -20°C to 70°C operating range
• Condition: New Original / New Surplus

Product Introduction

The GE IS420ESWBH2A is an ESWB industrial Ethernet/IONet switch designed for GE’s Mark VIe and Mark VIeS safety control systems. It combines 8 copper RJ45 ports with 2× 100Base-FX multi-mode fiber LC ports to bridge deterministic IONet traffic with standard plant Ethernet — all in a single DIN-rail mountable unit.

This switch handles up to 16 Gbps of switching capacity at 11.9 Mpps, with IEEE 1588 PTP v2 transparent clock support for sub-microsecond time synchronization across the control network. Its RJ45 connectors are rated for 200+ insertion/removal cycles, and the soft-start power circuit limits inrush current to under 200% of normal operating draw — a detail that matters when you’re energizing a panel full of sensitive control modules.

Key Technical Specifications

Quality Control Process

Every IS420ESWBH2A gets a full functional bench test before it ships. We start with a visual inspection — checking the RJ45 port contacts for bent pins, the LC fiber connectors for scratches or contamination, and the PCB for any signs of thermal stress or capacitor swelling.

Then we power it up on a regulated 24 V DC supply and verify the LED indicators sequence correctly through power-on, link establishment, and activity states. We test all 8 RJ45 ports for auto-negotiation at 10/100/1000 Mbps using a network cable tester, and verify the 2× LC fiber ports for proper light levels and link establishment with a fiber power meter. We also confirm the IEEE 1588 PTP transparent clock function is operational and verify the PRP/HSR redundancy protocol handshake. Finally, we measure the inrush current during power-up to confirm the soft-start circuit is functioning within spec — keeping it under 200% of normal draw. Each unit ships in anti-static foam with a moisture barrier bag and fiber port dust caps installed.

Replacement Pitfall Guide

❗ Verify your fiber port count before ordering. The ESWB family has five variants, and the IS420ESWBH2A specifically has 2× 100Base-FX fiber ports. If your existing network topology relies on fiber uplinks and you accidentally order a copper-only variant (like the IS420ESWBH3A with 16 copper ports and zero fiber), you’ll be re-cabling during a maintenance window — not ideal.

❗ Confirm your DIN rail type. This switch mounts on TS-35/7.5 or TS-35/15 DIN rail. If your panel uses an older or non-standard rail profile, the mounting clips may not seat properly. A loose switch in a high-vibration turbine control cabinet can cause intermittent link drops that look like cable failures.

❗ Check your IONet topology before swapping. The IS420ESWBH2A is a non-managed switch — it doesn’t store a configuration file. But the physical port assignments matter. If you’re replacing a failed unit, label every cable before disconnecting. The copper ports support auto MDI/MDIX, but the fiber ports are direction-sensitive (TX/RX). Swapping a fiber patch cable can kill the link.

❗ Don’t ignore the inrush current spec. The soft-start circuit limits inrush to under 200% of normal operating current. If you’re installing this switch on a shared 24 V DC supply with other control modules, verify the power supply has enough headroom. A marginal supply can cause brownouts on adjacent devices during switch power-up.

Keep these in mind and you’ll cut 90% of rework time.

Compatibility Matrix & Benchmarks

• Switching Capacity: 16 Gbps non-blocking
• Time Sync Accuracy: IEEE 1588 PTP v2 transparent clock, sub-microsecond synchronization across IONet