Power outages can strike without warning, shutting down critical equipment and causing costly downtime. An ATS 100A automatic transfer switch solves this problem by automatically switching your load between the main power supply and backup sources — with no manual intervention required. Whether you are running a solar battery system, a standby generator or a small commercial facility, this 100A changeover switch keeps your power continuous.

What Is an ATS 100A Automatic Transfer Switch?

An automatic transfer switch (ATS) is an electrical control device that monitors the incoming utility voltage and automatically transfers the connected load to an alternative power source when mains power fails. The 100A ATS is rated for continuous current up to 100 amps, making it a popular choice for single-phase homes, small shops, water pumps and residential solar storage systems.

When grid power is normal, the ATS keeps your load on the utility supply. When a blackout or undervoltage is detected, it instantly switches the load to the generator or solar inverter. Once the mains power recovers to a stable level, the switch automatically returns the load to the grid — restoring your normal power supply without anyone touching the panel.

How Does the 100A Automatic Transfer Switch Work?

The working principle of the auto changeover switch is simple but reliable:

1. Voltage monitoring – The ATS control module continuously senses the utility supply voltage.
2. Transfer signal – If mains voltage drops below the preset threshold (typically due to outage, brownout or phase loss), the controller sends a start signal to the backup generator.
3. Load transfer – Once the generator output stabilizes, the ATS mechanically transfers the load from mains to generator within seconds.
4. Return to mains – When grid power is restored and stable for a set delay period, the ATS transfers the load back automatically.

This automatic switching sequence protects sensitive equipment from power surges and prevents back-feeding, ensuring safe and reliable operation in any backup power system.

Key Applications of the ATS 100A

The automatic transfer switch 100 amp is widely used across many scenarios:

• Solar energy storage systems – switches between grid and battery inverter during off-peak hours or outages
• Standby generator sets – automatic start and load transfer for diesel or petrol generators
• Commercial buildings – retail shops, offices, small workshops requiring uninterrupted power
• Residential homes – home backup power for refrigerators, lighting and essential circuits
• Water pump stations & remote sites – locations with unstable grid supply
• Power distribution cabinets – easy DIN-rail or panel mounting inside switchgear

Why Choose Our ATS 100A Automatic Transfer Switch?

• 100A rated current – suitable for most household and small commercial loads
• Automatic & manual modes – manual changeover option for maintenance and testing
• Compact design – saves cabinet space and simplifies wiring
• Clear status indicators – power source and switching state visible at a glance
• Protection features – undervoltage, overvoltage and phase-loss protection options
• Cost-effective – a practical alternative to expensive custom switchgear

Related Products & System Integration

The ATS 100A works best when integrated into a complete power distribution solution. For larger loads, we also offer ATS 63A, ATS 160A and ATS 250A models. Pair your transfer switch with a moulded case circuit breaker (MCCB) for overload and short-circuit protection, an AC contactor for remote switching control, and a surge protective device to guard against lightning and transient overvoltage.

For solar applications, combine the ATS with a solar combiner box and PV distribution components to build a complete photovoltaic power system. Our engineering team can provide a full dual power automatic switching solution tailored to your project.

Customization & OEM Options

We support OEM/ODM customization for the ATS 100A automatic transfer switch, including:

• Custom voltage ratings (110V / 220V / 380V / 415V)
• Single-phase and three-phase configurations
• Custom logo, packaging and labeling
• Auxiliary contact and remote monitoring options
• Special control logic for solar/grid hybrid systems

Contact us with your project requirements, and our engineers will recommend the right configuration.

FAQ

Q1: What does a 100A automatic transfer switch mean? A: It means the ATS is designed to handle continuous load current up to 100 amps. For typical home backup loads (2–5 kW), a 100A rating provides sufficient capacity.

Q2: Can the ATS 100A work with solar inverters? A: Yes. The ATS 100A can switch between grid and inverter output, making it suitable for off-grid and hybrid solar storage systems.

Q3: What is the difference between an ATS and a manual changeover switch? A: An ATS transfers load automatically when power fails, while a manual changeover switch requires an operator to physically switch sources. ATS provides faster, safer and unattended operation.

Q4: How long does the load transfer take? A: Typical transfer time is within 1–3 seconds, depending on the generator start-up time and model configuration.

Q5: Can I use a 100A ATS for three-phase systems? A: We offer both single-phase and three-phase 100A ATS models. Please confirm your system type when ordering.

Q6: How do I choose the right ATS rating for my generator? A: Calculate your total connected load and add a safety margin. If your load exceeds 100A, choose a higher-rated automatic transfer switch such as 160A or 250A.

Conclusion

The ATS 100A automatic transfer switch is an essential component for any reliable backup power system. Whether you need automatic switching for a solar storage project, a standby generator or a commercial facility, this 100A auto changeover switch delivers dependable performance, simple installation and long service life.

Ready to upgrade your power system? Browse our [automatic transfer switch] collection or contact our team for a free quotation and technical support.