Dual Power Automatic Transfer Switch

As a supplier / manufacturer / factory in China, Pugao(PLANNTER Electric) provides OEM/ODM customized service with perfect quality and after-sales system, the Dual Power Automatic Transfer Switches are widely used in hospital outpatient clinics, telecommunication base stations, commercial buildings, important lighting and residential units and other sensitive scenarios of power failure.

What is a Dual Power Automatic Transfer Switch?

A Dual Power Automatic Transfer Switch is an electrical device that automatically switches the power supply between a primary source (utility grid) and a backup source (such as a generator or secondary power line). It ensures continuous power by detecting failures in the main supply and transferring the load to the backup source without manual intervention.

Widely used in residential, commercial, and industrial systems, it improves power reliability and safety. With features like fast switching, built-in interlock protection, and dual operation modes (automatic and manual), it helps prevent power interruptions and protects critical equipment.

Main Features and Advantages

Automatic/manual dual-use: support for electric automatic switching and manual switching, to ensure that in special conditions can be manually intervened, convenient maintenance and testing.

Fast switching speed: The Dual Power Automatic Transfer Switch mechanism is designed to be stable and reliable, which ensures that the backup power supply can be put into operation quickly after the failure of the common power supply and reduces the time of power failure.

Suitable for household rail mounting: designed for distribution cabinets and distribution boxes, easy to install and occupies little space.

High safety: Built-in interlock and fail-safe logic prevents dangerous situations such as simultaneous closure of dual power supplies and reverse power feeding.

Long life and low maintenance: adopting high quality contacts and driving mechanism, strong durability and long maintenance cycle, suitable for long-term continuous operation.

Flexible electrical parameters: Dual Power Automatic Transfer Switch supports a variety of voltage levels and rated current specifications, easy to select according to the site load.

After-sales service

Delivery Time: Standard delivery time is usually 10~15 working days depending on the customized requirements and order quantity.

Payment Methods: Commonly 30% deposit + 70% payment before shipment, support wire transfer, Western Union and letter of credit and other methods.

Certification and Documentation: The factory complies with CE, CCC and ISO certification. We can provide factory inspection report, type test report and related certification documents.

Dual Power Automatic Transfer Switch Guide

How does it work?

• The Dual Power Automatic Transfer Switch monitors the status of the main and standby power supplies in real time.
• When the main power fails, it automatically transfers the load to the backup source within seconds.
• After the main power recovers, the Dual Power Automatic Transfer Switch switches back safely to ensure stable operation.
• Supports both automatic and manual modes for maintenance or emergency control.

What are the applications?

• Hospitals and clinics where uninterrupted power is critical.
• Telecommunication base stations and data centers.
• Commercial buildings, lighting systems, and residential distribution boxes.
• Industrial systems requiring continuous and reliable power supply.

What to look for in a switch?

• Fast switching speed to minimize downtime.
• Reliable interlock system to prevent dual power overlap.
• Compliance with certifications such as CE, CCC, and ISO.
• Compact DIN rail design for easy installation and maintenance.

What factors determine the right switch?

• Rated voltage and current (e.g., 400V, 60A) based on load requirements.
• Type of load (resistive, inductive, or mixed).
• Installation environment (temperature, humidity, enclosure type).
• Need for manual override and system compatibility.

What is the difference between open and closed transition?

• Open Transition: Break-before-make switching; there is a short power interruption during transfer, commonly used for standard applications.
• Closed Transition: Make-before-break switching; both sources are briefly connected, ensuring no interruption but requiring precise synchronization.
• The Dual Power Automatic Transfer Switch is typically designed with open transition for safety and simplicity in most applications.