abb Automatic transfer switch 40 amps with 4 Poles

Why Choose the ABB OTM40F4C21D400C Automatic Transfer Switch?

The ABB OTM40F4C21D400C is a compact and highly reliable automatic transfer switch (ATS) designed for seamless switching between primary and standby power sources in commercial, industrial and infrastructure applications. As part of the advanced ABB Compact ATS range, this motor operated transfer switch automatically transfers electrical loads during mains failures to help maintain continuous power availability for critical systems.

Engineered for dependable low-voltage switching applications, the ABB OTM compact ATS series combines intelligent automatic transfer functionality, compact dimensions and robust electrical performance in a single integrated unit. ABB transfer switches are trusted worldwide by panel builders, electrical engineers and industrial contractors for installations requiring dependable source transfer and operational continuity.

With a 40 A operational current rating, 4-pole switching configuration and a 380–415 V AC motor operating voltage, the OTM40F4C21D400C is ideal for generator changeover systems, small commercial installations and industrial power continuity applications. The integrated 21D controller provides adjustable operating parameters for flexible automatic transfer functionality and simplified commissioning.

Key Advantages

• Compact automatic transfer switch for standby power systems.
• 40 A operational current rating for low-voltage installations.
• 4-pole switching configuration including neutral switching.
• Reliable motor operated automatic source transfer.
• Integrated 21D automatic controller with adjustable parameters.
• Compact footprint for switchboards and distribution panels.

Key Features

• ABB Compact ATS series.
• 40 A rated operational current.
• 4-pole automatic transfer switching.
• 380–415 V AC motor operating voltage.
• Integrated 21D controller with adjustable operating parameters.
• Open transition switching type 1-0-2.
• Self-supplied compact ATS unit.
• Direct mounted operating handle.
• Suitable for base or DIN rail mounting.

Technical Specifications

• Manufacturer: ABB
• Series: Compact ATS Switches
• Model: OTM40F4C21D400C
• Product ID: 1SCA151253R1001
• Product type: Automatic transfer switch
• Rated operational current: 40 A
• Number of poles: 4P
• Motor operational voltage: 380–415 V AC
• Controller type: 21D
• Transition type: Open transition 1-0-2
• Rated operational voltage: 380–415 V AC
• Rated insulation voltage (Ui): 800 V
• Rated impulse withstand voltage (Uimp): 8 kV
• Frequency: 50 / 60 Hz
• Short-time withstand current: 2.5 kA for 1 second
• Rated operational power AC-23A: 18.5 kW at 380–415 V AC
• Power loss: approx. 1.6 W per pole
• Mounting type: Base or DIN rail mounting
• Protection rating: Front IP20
• Position of line terminals: Supplies on top - Load on bottom
• Fourth pole type: Switched simultaneous function
• Terminal type: Screw terminals
• Dimensions (H × W × D): approx. 103 × 286 × 131 mm
• Weight: approx. 2.11 kg

Reliable Automatic Source Transfer for Essential Installations

Automatic transfer switches such as the ABB OTM40F4C21D400C continuously monitor available power sources and automatically transfer electrical loads during mains failures or generator startup events. This helps reduce downtime while maintaining continuity for essential systems and electrical infrastructure.

The ABB Compact ATS range is widely used in commercial buildings, generator systems and industrial control applications where compact dimensions, dependable operation and straightforward installation are required. Its integrated motor mechanism and configurable automatic controller simplify switchboard integration while improving operational reliability.

Typical Applications

• Automatic mains and standby generator transfer systems.
• Commercial distribution boards and switchboards.
• Industrial control panels and machinery.
• Critical backup power applications.
• HVAC and building services systems.
• Small infrastructure and telecommunications systems.

Trusted by Electrical Engineers Worldwide

ABB Compact ATS transfer switches are trusted worldwide for dependable source transfer performance, compact construction and reliable operation in critical power continuity applications.