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OXA260U3O3QB ABB TruONE 400 A IEC 4-Pole Automatic Transfer Switch Level 3 Overlapping Neutral
ABB OXA260U3O3QB is a 400 A IEC and 260 A UL 4-pole TruONE automatic transfer switch with Level 3 controls, open-transition operation, overlapping neutral, bottom source connections and top load connections.
£6,499.43
Why Choose the ABB OXA260U3O3QB TruONE Automatic Transfer Switch?
The ABB OXA260U3O3QB is a 400 A IEC, 4-pole TruONE automatic transfer switch (ATS) designed for automatic transfer of critical electrical loads between two power sources. Part of the ABB TruONE ATS range, it integrates the transfer switch and controller into a single purpose-built assembly, helping simplify installation while providing dependable automatic power-source transfer.
This model features Level 3 controls, open-transition I-II operation and an overlapping neutral. The overlapping neutral arrangement ensures that the neutral remains connected to the load during transfer from one source to another, with a neutral contact overlap period below 100 ms and the overlapping neutral pole positioned on the right-hand side.
The OXA260U3O3QB has a 400 A IEC rated current and 260 A UL rated current with a 4-pole configuration. Source 1 and Source 2 connections are positioned at the bottom, while the load connections are positioned at the top, providing the specified bottom-source/top-load arrangement for compatible switchboards and power distribution systems.
Key Advantages
- 400 A IEC rated automatic transfer switch for critical and standby power systems.
- 260 A UL rated current for UL applications.
- 4-pole configuration with overlapping neutral functionality.
- Integrated Level 3 controls for automatic transfer management and monitoring.
- Open-transition I-II operation without a stable OFF position between sources.
- Overlapping neutral maintains neutral continuity during source transfer.
- Bottom source connections and top load connections support the specified switchboard layout.
Key Features
- ABB TruONE ATS series.
- 400 A IEC rated current.
- 260 A UL rated current.
- 4-pole automatic transfer switch.
- Level 3 controller with LCD interface.
- Open-transition I-II operation.
- Overlapping neutral with contact overlap below 100 ms.
- Overlapping neutral pole positioned on the right-hand side.
- Source 1 and Source 2 connections at the bottom.
- Load connections at the top.
- Manual operating handle included.
- Supplied with a 2 m connection cable between the detachable HMI and ATS frame.
Integrated Automatic Transfer with Overlapping Neutral
The ABB TruONE platform combines the transfer switching mechanism, sensing and automatic control functions into an integrated ATS assembly. This self-contained architecture reduces the number of separate wires, connections and components required compared with conventional automatic transfer systems, helping simplify installation and improve system reliability.
The OXA260U3O3QB combines open-transition I-II operation with an overlapping neutral and Level 3 controls. During transfer, the neutral remains connected to the load, with the neutral contacts overlapping for less than 100 ms. Its 400 A IEC rating and bottom-source/top-load configuration make it suitable for demanding commercial, infrastructure and industrial power distribution applications.
Typical Applications
- Automatic mains-to-generator transfer systems.
- Critical and standby power distribution systems.
- Commercial and industrial electrical switchboards.
- Emergency and alternative power supply systems.
- Building services and infrastructure power distribution.
- Industrial installations requiring automatic source transfer with overlapping neutral.
Technical Specifications
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| Operation | Automatic | |
|---|---|---|
| Device Type | Automatic transfer switch | |
| Series | TruONE ATS | |
| ABB order code | 1SCA152791R1001 | |
| Product group | OT Change over Switches | |
| Product type | Automatic transfer switch | |
| Rated current (IEC) | 400 A | |
| Rated current (UL) | 260 A | |
| Number of poles | 4 | |
| Controller | Level 3 | |
| Controller interface | LCD | |
| Transition type | Open transition with overlapping neutral | |
| Operating sequence | I-II without stable OFF position | |
| Neutral configuration | Overlapping neutral | |
| Neutral overlap period | Below 100 ms | |
| Overlapping neutral position | Right-hand pole | |
| Source connection position | Bottom | |
| Load connection position | Top | |
| Operating voltage range | 200–480 V AC | |
| Rated insulation voltage | 1000 V | |
| Rated impulse withstand voltage | 12 kV | |
| Rated short-time withstand current | 25 kA rms for 0.3 s | |
| Standards | UL 1008 / IEC 60947-6-1 | |
| Weight | approx. 18 kg |
Frequently Asked Questions
What is the ABB OXA260U3O3QB used for?
The ABB OXA260U3O3QB is a 4-pole TruONE automatic transfer switch designed to transfer critical electrical loads automatically between two power sources in standby, emergency and industrial power systems.
What is the current rating of the OXA260U3O3QB?
The OXA260U3O3QB has a rated current of 400 A under IEC ratings and 260 A under UL ratings.
What does overlapping neutral mean on the OXA260U3O3QB?
Overlapping neutral means the neutral remains connected to the load during source transfer. The neutral contacts overlap for less than 100 ms, with the overlapping neutral pole located on the right-hand side.
Where are the source and load connections on the OXA260U3O3QB?
The OXA260U3O3QB has Source 1 and Source 2 connections at the bottom and the load connections at the top.
Which controller is fitted to the ABB OXA260U3O3QB?
The OXA260U3O3QB uses ABB Level 3 controls with an LCD interface and includes a detachable HMI connected to the ATS frame by a supplied 2 m connection cable.
Trusted by Critical Power Professionals Worldwide
ABB TruONE automatic transfer switches integrate switching and control functions into a purpose-built ATS platform, helping electrical engineers, panel builders and system integrators implement dependable automatic power-source transfer in commercial, infrastructure and industrial electrical systems.
