abb Automatic transfer switch 125 amps with 4 Poles

Why Choose the ABB OTM125F4C20D400C Automatic Transfer Switch?

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.

Key Advantages

• Compact automatic transfer switch for critical power continuity.
• 125 A operational current rating for low-voltage power systems.
• 4-pole switching design including neutral switching.
• Reliable motor operated automatic transfer functionality.
• Suitable for standby generator and dual-source applications.
• Compact construction simplifies switchboard integration.

Key Features

• ABB OTM Compact ATS series.
• 125 A rated operational current.
• 4-pole automatic change-over switching.
• 380–415 V AC motor operational voltage.
• Motor operated open transition type 1-0-2 switching.
• Self-supplied controller with fixed operating parameters.
• Base mounting or DIN rail mounting capability.
• Compact switchboard-friendly design.

Technical Specifications

• Manufacturer: ABB
• Series: OTM Compact ATS
• Model: OTM125F4C20D400C
• 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

Reliable Automatic Source Transfer for Critical Systems

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.

Typical Applications

• Automatic mains and standby generator transfer systems.
• Commercial buildings and facilities management.
• Industrial power distribution panels.
• Backup power and emergency supply systems.
• Electrical switchboards and automation systems.
• Critical low-voltage power continuity applications.

Trusted by Electrical Engineers Worldwide

ABB OTM Compact ATS transfer switches are trusted worldwide for dependable automatic source transfer, compact construction and reliable performance in critical power systems.