OXA400U3O3QB ABB TruONE 400A 4-Pole Automatic Transfer Switch

Why Choose the ABB TruONE OXA400U3O3QB Automatic Transfer Switch?

The ABB TruONE OXA400U3O3QB is a robust 400 A 4-pole automatic transfer switch designed for reliable automatic transfer between two electrical power sources in critical power distribution systems. Supplied under ABB order code 1SCA149943R1001, it integrates the switching mechanism and controller into ABB's purpose-built TruONE ATS platform. :chatgpt-content-reference{index="0"}

This model features a 4-pole switched-neutral configuration with open-transition I-II operation and a Level 3 LCD controller. The fourth pole uses a switched late-break and early-make function, providing neutral switching characteristics suitable for advanced automatic transfer applications. :chatgpt-content-reference{index="1"}

The OXA400U3O3QB uses a bottom-entry supply arrangement with Source 1 and Source 2 connections at the bottom and load connections at the top. Its wide 200–480 V AC operating range and integrated controller make it suitable for industrial, commercial and critical standby power systems. :chatgpt-content-reference{index="2"}

Key Advantages

• 400 A automatic transfer switch for industrial and commercial power applications.
• Integrated TruONE architecture combines the switch and controller in one unit.
• 4-pole switched-neutral design supports complete source transfer including neutral.
• Open-transition I-II operation transfers between sources without paralleling supplies.
• Level 3 LCD controller provides advanced ATS monitoring and control.
• 200–480 V AC voltage range supports a broad range of installations.
• Bottom-entry supply arrangement simplifies integration into suitable switchboards.
• Direct-mounted handle provides local manual operation capability.

Key Features

• ABB TruONE ATS integrated automatic transfer switch.
• IEC rated current: 400 A.
• UL/CSA rated current: 400 A at 200–480 V AC.
• 4-pole configuration.
• Fourth pole: Switched late-break and early-make function.
• Open-transition I-II operation.
• Level 3 controller with LCD interface.
• Rated operational voltage: 200–480 V AC.
• Bottom entry: supply connections at bottom, load connections at top.
• Direct-mounted handle.
• Bolt terminal connection system.
• Front protection rating IP20.

Integrated Automatic Power Transfer for Critical Systems

ABB TruONE combines the automatic transfer switch and controller into a single purpose-built assembly, reducing external wiring and connection points compared with traditional ATS solutions. The OXA400U3O3QB provides automatic source transfer using open-transition I-II operation with Level 3 LCD-based control. :chatgpt-content-reference{index="3"}

Its switched-neutral 4-pole design allows the neutral conductor to be transferred with the phase conductors, while the late-break and early-make fourth pole arrangement provides controlled neutral switching behaviour. Combined with its 400 A rating, 200–480 V AC capability and bottom-entry connection layout, it provides a flexible solution for critical and standby power installations. :chatgpt-content-reference{index="4"}

Typical Applications

• Mains-to-generator automatic transfer systems.
• Industrial power distribution switchboards.
• Commercial building standby power systems.
• Critical manufacturing and process installations.
• Data centres and communications infrastructure.
• Healthcare and essential-services electrical systems.
• Automatic source selection installations.
• 4-pole systems requiring switched-neutral transfer.