ABB OTM125F3C21D400C automatic transfer switch with 125 A current rating, 3-pole switching configuration and 400 V AC motor operation for industrial and commercial power transfer systems.
£1,896.36
The ABB OTM125F3C21D400C is a compact and highly reliable automatic transfer switch (ATS) designed for efficient switching between power sources in industrial and commercial electrical systems. As part of the trusted ABB OTM motorised change-over switch range, this switch provides dependable automatic transfer functionality for applications requiring continuous power availability and operational safety.
Engineered for standby generator systems and dual power supply applications, the OTM series combines motorised automation with compact switchboard-friendly construction. ABB transfer switches are widely used by electrical engineers and panel builders for critical installations where reliable source switching and minimal downtime are essential.
With a 125 A current rating, 3-pole switching configuration and a 400 V AC motor operating voltage, the OTM125F3C21D400C is ideal for low-voltage power transfer systems in industrial automation, commercial buildings and backup power installations. Its motorised operating mechanism enables smooth automatic operation while supporting manual emergency control when required.
Automatic transfer switches such as the ABB OTM125F3C21D400C automatically switch electrical loads between available power sources during supply interruptions or generator startup conditions. This ensures operational continuity while protecting critical systems against unexpected power loss.
ABB OTM transfer switches are designed for long-term reliability and are widely used in commercial buildings, industrial facilities and generator control systems. Their motorised operation and compact design make them ideal for modern low-voltage switchboards and automation installations.
| Current | 125 A |
|---|---|
| Phase | Three Phase |
| IP Rating | IP20 |
| Series | OTM Automatic Transfer Switches |
| Product type | Automatic transfer switch |
| Rated operational current | 125 A |
| Number of poles | 3P |
| Motor operating voltage | 380–415 V AC |
| Rated operational voltage | up to 690 V AC |
| Frequency | 50 / 60 Hz |
| Protection rating | IP20 front protection |
| Mounting type | Base mounting |
| Operation type | Motorised automatic operation |
| Transition type | Open transition |
| Short-circuit withstand | High short-time withstand capability |
| Dimensions (H × W × D) | approx. 230 × 210 × 145 mm |
| Weight | approx. 4.8 kg |
| HS Code | 85365080 |
| Country of Manufacture | China |
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 motorised operating mechanism requires a 380–415 V AC supply.
No. This model uses a 3-pole configuration designed for switching phase conductors only.
The unit is typically installed in electrical switchboards, generator panels and low-voltage power distribution systems.
ABB OTM automatic transfer switches are trusted worldwide for dependable source transfer operation, compact design and reliable performance in critical power applications.
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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...