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OXA125U3S3QB ABB TruONE 125 A 4-Pole Automatic Transfer Switch Level 3
ABB OXA125U3S3QB is a 125 A 4-pole TruONE automatic transfer switch with a Level 3 controller, open-transition operation, bottom source connections and top load connections for automatic power transfer applications.
£6,999.58
Why Choose the ABB OXA125U3S3QB TruONE Automatic Transfer Switch?
The ABB OXA125U3S3QB is a 125 A, 4-pole TruONE automatic transfer switch (ATS) designed for automatic transfer of electrical loads between two power sources. Part of ABB's TruONE ATS range, it integrates the transfer switching mechanism and controller into a compact assembly for critical, standby and industrial power distribution applications.
This model features a Level 3 controller and open-transition I-II operation without a stable OFF position between positions I and II. The integrated TruONE architecture helps reduce separate components and wiring while providing automatic source monitoring, transfer control and a user interface for system operation.
With a 125 A UL rated current and 4-pole configuration, the OXA125U3S3QB is designed with Source 1 and Source 2 connections at the bottom and load connections at the top. This bottom-source/top-load arrangement supports convenient integration into compatible switchboards and automatic power transfer systems.
Key Advantages
- 125 A UL rated automatic transfer switch for critical and standby power applications.
- 4-pole configuration suitable for three-phase systems with switched neutral.
- Integrated Level 3 controller for automatic transfer control and monitoring.
- Open-transition I-II operation without a stable OFF position between sources.
- Source connections at the bottom and load connections at the top.
- Integrated TruONE architecture helps reduce external wiring and separate components.
- Designed for electrical systems operating within the 200–480 V AC range.
Key Features
- ABB TruONE ATS series.
- 125 A UL rated current.
- 4-pole automatic transfer switch.
- Level 3 controller.
- Open-transition transfer operation.
- I-II operation without stable OFF position between positions I and II.
- Bottom entry for Source 1 and Source 2 connections.
- Top load connections.
- Detachable HMI with 2 m RJ45 connection cable to the ATS frame.
- Manual operating handle included for manual operation.
Integrated Automatic Power Transfer for Critical Loads
Automatic transfer switches provide controlled transfer of electrical loads between normal and alternative power sources. The ABB TruONE platform combines the switching mechanism, sensing and transfer control functions into an integrated ATS, helping reduce installation complexity and the number of separate connections required within a power distribution assembly.
The OXA125U3S3QB uses open-transition I-II operation and a Level 3 controller to manage automatic source transfer. Its 125 A, 4-pole configuration and bottom-source/top-load connection arrangement make it suitable for commercial, infrastructure and industrial installations requiring dependable automatic transfer between two electrical supplies.
Typical Applications
- Automatic mains-to-generator transfer systems.
- Commercial and industrial electrical switchboards.
- Critical and standby power distribution systems.
- Emergency power installations.
- Building services and infrastructure power systems.
- Industrial facilities requiring automatic transfer between two power sources.
Technical Specifications
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| Coil / Supply Voltage | 200–480 V AC | |
|---|---|---|
| Operation | Automatic | |
| Device Type | Automatic transfer switch | |
| Series | TruONE ATS | |
| ABB order code | 1SCA153275R1001 | |
| Product group | OT Change over Switches | |
| Product type | Automatic transfer switch | |
| Rated current (UL) | 125 A | |
| Number of poles | 4 | |
| Configuration | 3-pole + neutral | |
| Controller | Level 3 | |
| Transition type | Open transition | |
| Operating sequence | I-II without stable OFF position | |
| Operating voltage | 200–480 V AC | |
| Maximum rated operating voltage | 480 V AC | |
| Source connection position | Bottom | |
| Load connection position | Top | |
| Front protection rating | IP20 | |
| Main circuit connection | Bolt connection | |
| Dimensions (H × W × D) | approx. 305 × 375 × 183 mm | |
| Weight | approx. 15.94 kg |
Frequently Asked Questions
What is the ABB OXA125U3S3QB used for?
The ABB OXA125U3S3QB is a 125 A automatic transfer switch designed to transfer electrical loads automatically between two power sources in standby, emergency and critical power applications.
How many poles does the OXA125U3S3QB have?
The OXA125U3S3QB has a 4-pole configuration, arranged as three phases plus a switched neutral.
Which controller is fitted to the ABB OXA125U3S3QB?
The OXA125U3S3QB is equipped with an ABB Level 3 controller for automatic transfer control, monitoring and system operation.
Where are the source and load connections on the OXA125U3S3QB?
The OXA125U3S3QB has Source 1 and Source 2 connections at the bottom, while the load connections are positioned at the top.
What type of transfer operation does the OXA125U3S3QB use?
The switch uses open-transition I-II operation without a stable OFF position between positions I and II.
Trusted by Critical Power Professionals Worldwide
ABB TruONE automatic transfer switches integrate switching, sensing 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 and industrial electrical systems.
