ABB OTC125G3-4BS 125 A four-pole manual change-over switch with I-0-II operation, base and DIN-rail mounting, padlockable direct handle and screw terminals for industrial power transfer applications.
The ABB OTC125G3-4BS, product code 1SCA162750R1001, is a heavy-duty four-pole manual change-over switch designed for safe and reliable switching between two independent power sources. As part of the advanced ABB OT Plus Change-Over Switch series, it provides dependable I-0-II operation for industrial electrical distribution, standby generator installations and commercial power systems.
Designed for panel builders, OEM manufacturers and electrical contractors, the OTC125G3-4BS features a compact front-operated design suitable for both base and DIN-rail mounting. Integrated screw terminals enable secure installation, while the supplied direct-mounted padlockable handle enhances operational safety during maintenance and servicing.
With a rated current of 125 A, a four-pole switching configuration and compliance with IEC 60947-3 and UL98, the OTC125G3-4BS is ideal for safely transferring electrical loads between mains and standby power supplies whilst providing complete electrical isolation.
The ABB OTC125G3-4BS enables safe manual transfer between two independent electrical power sources whilst ensuring complete isolation through its centre OFF position. Its four-pole construction switches all three phases together with the neutral conductor, making it ideal for standby generator systems and installations requiring complete circuit isolation.
Built using ABB's proven OT Plus switching technology, the OTC125G3-4BS delivers long mechanical life, dependable performance and straightforward installation, making it an excellent choice for demanding industrial and commercial electrical applications.
| Manufacturer | ABB |
|---|---|
| Series | OT Plus Change-Over Switches |
| Model | OTC125G3-4BS |
| Product ID | 1SCA162750R1001 |
| EAN | 6417019928180 |
| Product type | Manual change-over switch |
| Rated current | 125 A |
| Number of poles | 4 |
| Operating positions | I-0-II |
| Standards | IEC 60947-3 / UL98 |
| Rated insulation voltage (Ui) | 800 V |
| Rated impulse withstand voltage (Uimp) | 8 kV |
| Operational voltage | Up to 800 V AC (IEC), 600 V AC (UL) |
| Mounting type | Base mounting / DIN-rail mounting |
| Frame size | G3 |
| Copper conductor range | 2.5 to 70 mm² |
| Protection rating | IP20 (front) |
| Terminal type | Screw terminals |
| Handle | Direct-mounted, padlockable knob handle |
| HS Code | 85365080 |
| Country of Manufacture | Finland |
The OTC125G3-4BS manually transfers electrical loads between two separate power supplies such as the utility supply and a standby generator.
The ABB OTC125G3-4BS has a rated operational current of 125 A.
The four-pole configuration switches all three phases together with the neutral conductor, providing complete electrical isolation where required.
Yes. The supplied direct-mounted operating handle is padlockable to help prevent accidental or unauthorised operation during maintenance.
It is commonly installed inside electrical switchboards, industrial control panels and generator change-over systems using base or DIN-rail mounting.
ABB OT Plus change-over switches are trusted by electrical engineers, panel builders and OEM manufacturers for dependable manual power transfer, robust construction and reliable long-term performance in industrial electrical 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...