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1SCA162750R1001 ABB OTC125G3-4BS OT Plus Panel Mounted Switch Disconnector
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.
Why Choose the ABB OTC125G3-4BS Change-Over Switch?
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.
Key Advantages
- Reliable I-0-II manual change-over operation.
- 125 A rated current for industrial and commercial power distribution.
- Four-pole switching including the neutral conductor.
- Suitable for base and DIN-rail mounting.
- Supplied with a padlockable direct-mounted operating handle.
- Integrated screw terminals simplify installation and maintenance.
Key Features
- ABB OT Plus Change-Over Switch series.
- 125 A rated operational current.
- Four-pole manual change-over switch.
- I-0-II switching positions.
- Front-operated mechanism.
- Base and DIN-rail mounting options.
- IP20 protected front terminal clamps.
- Integrated screw terminals for copper conductors.
- Direct-mounted black padlockable operating handle included.
- Compatible with external operating shaft accessories.
Reliable Power Transfer and 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.
Typical Applications
- Mains and standby generator change-over systems.
- Industrial electrical distribution panels.
- Commercial buildings and infrastructure.
- Manufacturing machinery and production facilities.
- Control panels and switchboards.
- Alternative power supply and maintenance isolation systems.
Technical Specifications
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| Mounting Type | DIN rail | |
|---|---|---|
| Device Type | Switch Disconnector | |
| Product Series | ABB OT Plus | |
| Poles | 4-pole | |
| 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 |
Frequently Asked Questions
What is the ABB OTC125G3-4BS used for?
The OTC125G3-4BS manually transfers electrical loads between two separate power supplies such as the utility supply and a standby generator.
What is the current rating of this switch?
The ABB OTC125G3-4BS has a rated operational current of 125 A.
Why does this model have four poles?
The four-pole configuration switches all three phases together with the neutral conductor, providing complete electrical isolation where required.
Can the operating handle be locked?
Yes. The supplied direct-mounted operating handle is padlockable to help prevent accidental or unauthorised operation during maintenance.
Where is the OTC125G3-4BS typically installed?
It is commonly installed inside electrical switchboards, industrial control panels and generator change-over systems using base or DIN-rail mounting.
Trusted by Electrical Professionals Worldwide
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.
