What will happen if the Utility Power restores?

Automatic Transfer Switch will switch to Utility Power from Generator Power. This is known as Auto-transfer and Auto-retransfer. Auto-transfer and Non-auto retransfer function can be provided upon specific customer request.

Can I use an automatic transfer switch with a solar inverter?

Yes, if the inverter provides an AC backup output that can supply the load during a utility outage. In this setup, the ATS switches the load between two sources: utility power and the inverters AC backup output. To select a suitable AISIKAI ATS, please share the inverter model, its backup output voltage and current rating, and the load you plan to supply.

Do your ATS support DC Voltage? Do you have DC12V or DC24V Automatic Transfer Switch?

Yes, we can customize DC voltage automatic transfer switch. We can supply DC12V, DC24V, DC48V ATS.

How does ATS work with power generators?

AISIKAI ATS solutions integrate high-reliability Intelligent Control Units, enabling the system to not only detect total utility failure in real-time but also provide precise diagnostics for complex grid environments. Full-Parameter Monitoring: The ATS system responds instantaneously to power outages. When equipped with AISIKAI ATS Controllers, the precision algorithms further extend protection by monitoring under-voltage, over-voltage, and phase loss. This ensures the generator is signaled to start only at the most critical and appropriate moments. Command-Based Transfer: Upon detecting a utility anomaly, the controller immediately sends a start signal to the generator. Once the generator reaches its rated speed and voltage, the ATS mechanism safely disconnects the utility source and simultaneously closes the generator circuit. Critical Load Protection: Within seconds, the AISIKAI system restores power to your home or busines

Can I use an ATS to trigger my generator to start?

Not directly. While an ATS signals the need for backup power when the utility fails, it does not manage the generators engine. The signal from the ATS is received by the generator controller, which then executes the start command. You need both devices working in tandem for a fully automated system.

Do I need a high-speed ATS?

It depends on the load type. In most cases, high-speed ATS is not necessary. It is only necessary for precision equipment that cannot tolerate even the slightest power interruption.

Can I operate ATS manually?

Yes, every ATS is equipped with one unit of manual handle. Before you operate manually, the ATS needs to be set to Manual Mode. Additionally, the operating direction is indicated on the ATS switch body.

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Automatic Transfer Switch Manufacturer

With 20 years of experience, AISIKAI manufactures automatic transfer switches (ATS) for generator manufacturers, panel builders, and electrical equipment distributors. Our range includes motorized and solenoid-operated ATS, with PC Class and CB Class options for different power distribution requirements.

Compare the series below by rated current, number of poles, switching mechanism, and control requirements to find a suitable starting point for your project.

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Best Selling Automatic Transfer Switch

Compare AISIKAI Automatic Transfer Switch Series

MODEL	SKT1	ASKQ6	ASKQ8	ASKQ1
Driving Mechanism	Motorised (motorized)	Solenoid (electro-magnetic)	Solenoid (electro-magnetic)	Solenoid (electro-magnetic)
Current	10A - 3200A	63A - 630A	630A - 6300A	6A - 63A
Operational Voltage	AC 400V / AC 690V	AC 230V (2P), AC 400V (3P, 4P)	AC 400V / AC 690V	AC 230V (2P), AC 400V (3P, 4P)
Control Voltage	AC 220V, Optional: AC 110V, 208V, 280V, 180-280V; DC 24V (20A-3200A), DC 12V/48V (20A-250A)	AC 230V	AC 230V, Optional: AC 208V-280V	AC 230V
Phases Available	Single or Three	Single or Three	Single or Three	Single or Three
Poles Available	2, 3 or 4	2, 3 or 4	3 or 4	2, 3 or 4
Positions Available	Ⅰ- 0 -Ⅱ	Ⅰ- 0 -Ⅱ/Ⅰ-Ⅱ	Ⅰ- 0 -Ⅱ	Ⅰ - Ⅱ
Utilization Category	AC-33A	AC-33A	AC-33A	AC-33iB
Transfer Time	0.6s-2.4s	≤0.2s	≤0.2s	≤0.2s

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Automatic Transfer Switch Basics

What Is an Automatic Transfer Switch (ATS)?

An automatic transfer switch (ATS) automatically transfers an electrical load between two power sources, typically utility power and a backup generator.

When utility power fails, the ATS transfers the load to the generator once backup power is available and stable. When utility power is restored, it can automatically transfer the load back, depending on the configured operating mode.

Why Use an ATS with a Backup Generator?

A standby generator provides backup power. An automatic transfer switch connects the load to that power once the generator is ready.

With a manual transfer switch, someone must be on site to make the change. An ATS handles the transfer automatically, even if the outage happens after hours.

What Does AC-33A Mean for an ATS?

AC-33A is a utilization category under IEC 60947-6-1 for switching motor loads or mixed loads that include motors. The suffix A identifies the frequent-operation category.

When selecting an ATS, check its rated operational current at the required voltage and utilization category—not just its maximum current rating.

PC Class vs CB Class

The main difference is how short-circuit protection is provided.

A PC Class ATS transfers power between sources and relies on coordinated external protective devices, such as circuit breakers or fuses, to clear short circuits.

A CB Class ATS uses circuit breakers with overcurrent releases to provide both power transfer and short-circuit interruption.

Selection depends on the protection arrangement of the complete electrical system.

Learn more: PC Class vs CB Class Automatic Transfer Switches

Motorized vs Solenoid-Operated ATS

A motorized ATS uses an electric motor to operate the switching mechanism. A solenoid-operated ATS uses electromagnetic force to actuate the mechanism and typically offers faster switching.

AISIKAI offers both designs. Compare the specified transfer time, current rating, operating positions, and controller functions of each model to find the right fit for your application.

2P, 3P, or 4P ATS: Which Do You Need?

The number of poles indicates how many conductors the switch transfers between power sources.

2P ATS: Typically used in single-phase line-and-neutral systems. Switches both the line and neutral conductors.

3P ATS: Used in three-phase systems where neutral switching is not required. Switches the three phase conductors, leaving the neutral connected where present.

4P ATS: Used in three-phase systems where neutral switching is required. Switches all three phase conductors and the neutral.

A 3P ATS leaves the neutral unswitched where one is present. A 4P ATS switches the neutral along with the three phase conductors.

The correct configuration depends on the system’s earthing arrangement, neutral bonding, ground-fault protection, and applicable installation requirements.

FAQ

What will happen if the Utility Power restores?

Automatic Transfer Switch will switch to Utility Power from Generator Power. This is known as Auto-transfer and Auto-retransfer.

Auto-transfer and Non-auto retransfer function can be provided upon specific customer request.
Can I use an automatic transfer switch with a solar inverter?

Yes, if the inverter provides an AC backup output that can supply the load during a utility outage. In this setup, the ATS switches the load between two sources: utility power and the inverter’s AC backup output.

To select a suitable AISIKAI ATS, please share the inverter model, its backup output voltage and current rating, and the load you plan to supply.
Do your ATS support DC Voltage? Do you have DC12V or DC24V Automatic Transfer Switch?

Yes, we can customize DC voltage automatic transfer switch. We can supply DC12V, DC24V, DC48V ATS.
How does ATS work with power generators?
AISIKAI ATS solutions integrate high-reliability Intelligent Control Units, enabling the system to not only detect total utility failure in real-time but also provide precise diagnostics for complex grid environments.
- Full-Parameter Monitoring:
The ATS system responds instantaneously to power outages. When equipped with AISIKAI ATS Controllers, the precision algorithms further extend protection by monitoring under-voltage, over-voltage, and phase loss. This ensures the generator is signaled to start only at the most critical and appropriate moments.
- Command-Based Transfer:
Upon detecting a utility anomaly, the controller immediately sends a start signal to the generator. Once the generator reaches its rated speed and voltage, the ATS mechanism safely disconnects the utility source and simultaneously closes the generator circuit.
- Critical Load Protection:
Within seconds, the AISIKAI system restores power to your home or business's emergency circuits. Throughout this period, the controller maintains "thermal monitoring" (active sensing) of the utility line conditions.
- Logic Re-transfer & Cool-down: Once the controller senses that utility power has returned and remains stable, the system automatically re-transfers the load back to the grid. It then commands the generator to run for a pre-set engine cool-down period before returning to standby mode.
Can I use an ATS to trigger my generator to start?

Not directly. While an ATS signals the need for backup power when the utility fails, it does not manage the generator's engine. The signal from the ATS is received by the generator controller, which then executes the start command. You need both devices working in tandem for a fully automated system.
Do I need a high-speed ATS?

It depends on the load type. In most cases, high-speed ATS is not necessary. It is only necessary for precision equipment that cannot tolerate even the slightest power interruption.
Can I operate ATS manually?

Yes, every ATS is equipped with one unit of manual handle. Before you operate manually, the ATS needs to be set to Manual Mode.

Additionally, the operating direction is indicated on the ATS switch body.