ABB OTM125F4CB21D400C automatic transfer switch with 125 A rating, 4-pole switching configuration and 380–415 V AC motor operation for industrial and commercial standby power systems.
£2,384.04
The ABB OTM125F4CB21D400C is a compact and dependable automatic transfer switch (ATS) designed for reliable source switching in industrial, commercial and standby power applications. As part of the advanced ABB OTM Compact ATS series, this motor operated change-over switch automatically transfers electrical loads between mains and backup power supplies to help maintain continuous operation of critical systems.
Designed for modern low-voltage power distribution systems, the OTM Compact ATS range combines robust switching capability with compact dimensions and simplified installation. ABB transfer switches are widely trusted by panel builders, electrical contractors and industrial engineers for applications requiring dependable power continuity and efficient automatic source transfer.
With a 125 A operational current rating, 4-pole switching configuration and a 380–415 V AC motor operating voltage, the OTM125F4CB21D400C is ideal for mains-to-generator transfer systems, industrial switchboards and commercial backup power installations. Its self-supplied controller with adjustable operating parameters provides flexible and reliable automatic operation.
Automatic transfer switches such as the ABB OTM125F4CB21D400C continuously monitor power supply availability and automatically transfer connected loads between power sources during supply interruptions. This helps maintain operational continuity while protecting essential systems and reducing downtime.
The ABB OTM Compact ATS range is widely used in generator systems, industrial automation and low-voltage power distribution applications. Its motor operated mechanism and compact design make it ideal for installations where reliable source transfer and efficient panel integration are essential.
| 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 |
| Controller type | 21D |
| 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 |
| Terminal position | Supplies on bottom, load on top |
| Fourth pole type | Switched simultaneous function |
| Short-time withstand current | 2.5 kA for 1 second |
| Dimensions (H × W × D) | approx. 103 × 286 × 131 mm |
| Weight | approx. 2.11 kg |
| HS Code | 85365080 |
| Country of Manufacture | China |
This automatic transfer switch is used to automatically transfer electrical loads between mains and standby power sources such as generators.
The switch supports a rated operational current of 125 A for industrial and commercial low-voltage systems.
The motor operated mechanism requires a 380–415 V AC supply.
Yes. The 4-pole configuration enables simultaneous switching of all conductors including the neutral connection.
The unit is commonly installed in switchboards, generator panels and industrial or commercial power distribution systems.
ABB OTM Compact ATS transfer switches are trusted worldwide for reliable automatic source transfer, compact construction and dependable performance in critical power applications.
● Service Agreements
Credit Accounts
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
● frequently asked questions
At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.
We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
● latest blog
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...