ABB OTM125F4C20D400C automatic transfer switch with 125 A rating, 4-pole switching configuration and 380–415 V AC motor operation for industrial and commercial power transfer systems.
£2,755.59
The ABB OTM125F4C20D400C is a compact and highly reliable automatic transfer switch (ATS) designed for automatic source switching in industrial, commercial and backup power applications. As part of the advanced ABB OTM Compact ATS series, this motor operated change-over switch provides dependable automatic transfer between mains and standby power supplies to help maintain continuous operation of critical electrical systems.
Designed specifically for modern low-voltage installations, the OTM Compact ATS range combines robust switching capability with compact dimensions and simplified installation. ABB transfer switches are trusted worldwide by panel builders, electrical contractors and industrial engineers for applications where dependable source transfer and operational continuity are essential.
With a 125 A operational current rating, 4-pole switching configuration and a 380–415 V AC motor operating voltage, the OTM125F4C20D400C is ideal for automatic generator transfer systems, power distribution panels and commercial standby power installations. Its self-supplied controller and open transition switching design ensure efficient and reliable operation in demanding environments.
Automatic transfer switches such as the ABB OTM125F4C20D400C continuously monitor power availability and automatically switch connected loads between available power sources during supply interruptions. This helps minimise downtime and maintain reliable operation of essential electrical systems and equipment.
The ABB OTM Compact ATS range is engineered for dependable operation in low-voltage power distribution systems. Its compact footprint, robust switching mechanism and integrated motor operation make it ideal for modern electrical installations where reliability and space efficiency are important.
| Current | 125 A |
|---|---|
| Phase | Three Phase |
| IP Rating | IP20 |
| Series | OTM Compact ATS |
| Product type | Automatic transfer switch |
| Rated operational current | 125 A |
| Number of poles | 4P |
| Motor operational voltage | 380–415 V AC |
| Rated insulation voltage (Ui) | 800 V |
| Rated impulse withstand voltage (Uimp) | 8 kV |
| Rated operational voltage | 380–415 V AC |
| Frequency | 50 / 60 Hz |
| Protection rating | Front IP20 |
| Mounting type | Base mounting or DIN rail mounting |
| Transition type | Open transition |
| Controller type | 20D |
| Dimensions (H × W × D) | approx. 103 × 286 × 131 mm |
| Weight | approx. 2 kg |
This automatic transfer switch is used to automatically transfer electrical loads between mains and backup power sources such as generators.
The switch supports a rated operational current of 125 A for low-voltage industrial and commercial systems.
The motor operated mechanism requires a 380–415 V AC supply.
Yes. The 4-pole configuration enables switching of all conductors including the neutral connection.
The unit is commonly installed in electrical switchboards, generator panels and commercial or industrial power distribution systems.
ABB OTM Compact ATS transfer switches are trusted worldwide for dependable automatic source transfer, compact construction and reliable performance in critical power systems.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...