Finding a dependable single-phase automatic transfer switch (ATS) is essential for uninterrupted power in homes and small businesses. The following picks are 5 high-quality options from trusted brands, designed to switch automatically between main and backup power sources with minimal downtime. Each product supports auto and manual modes, offers protection features, and is suitable for 110V or 220V single-phase systems. Use this guide to compare specs, installation needs, and safety features to choose the right ATS for your setup.
| Product | Brand | Voltage | Current | Notes |
|---|---|---|---|---|
| JONASC 63A 2P Dual Power Automatic Transfer Switch | JONAS C | AC110V | 6A-63A | 50/60Hz; auto & manual; protections including short circuit, overload, phase loss, undervoltage |
| JONASC 220V 63A 2P Dual Power Automatic Transfer Switch | JONAS C | AC220V | 63A | EPS fire power supply interface; auto & manual; similar protection features |
| 100Amp AC220V Automatic/Manual Transfer Switch 2P | IGEYAPA | AC220V | 100A | Auto switch within 0.05 seconds; four wiring; auto & manual modes |
| 110V Dual Power Automatic Transfer Switch Dual Power | TUQI | AC110V | 63A | 2-second transfer; durable construction; fast switching |
| Mini Size ATS 3P 100A 220V | JOTTAELE | AC220V | 100A | Rail-mount DIN rail design; 50/60Hz; auto & manual modes |
JONASC 63A 2P Dual Power Automatic Transfer Switch
This 63A two-pole automatic transfer switch supports AC110V operation, with a broad current range of 6-63A and a quick conversion time around 2 seconds. It provides both automatic and manual operation, enabling easy manual control when needed. It automatically transfers loads between main and backup power sources to maintain power supply. Protection features include short circuit, overload, phase loss, and undervoltage protection, enhancing safety and reliability in critical circuits.
JONASC 220V 63A 2P Dual Power Automatic Transfer Switch
Designed for 220V single-phase systems, this 63A two-pole unit integrates an EPS fire power supply interface for reliable long-distance operation. It supports automatic switching with a manual override and includes comprehensive protection like short circuit, overload, phase loss, and undervoltage. The device is suited for homes and small facilities relying on a stable secondary power source during outages.
100Amp AC220V Automatic/Manual Transfer Switch 2P
This 100A 2P switch handles automatic and manual switching between two power sources, supporting 0.05-second transfer to ensure continuity. It accepts connections from mains, generator, or PV sources, enabling fast and seamless handoff between power sources while monitoring status through indicator logic. The unit emphasizes reliability for both home and small commercial uses and includes manual mode operation and auto mode for automatic transitions.
110V Dual Power Automatic Transfer Switch Dual Power Generator Changeover
This 110V, 2P blue device ensures stable power by automatically transferring loads to standby during outages, switching back when main power returns. The transfer occurs in about 2 seconds, reducing downtime. It emphasizes durability through corrosion-resistant resin, a copper motor, and low-noise operation, making it suitable for environments requiring reliable, quick changes between sources.
Mini Size ATS 3P 100A 220V Changeover Switch
Although compact, this DIN-rail-mounted ATS is designed for home distribution boxes and supports 3P 100A at 220V. It operates in both automatic and manual modes, enabling fast transfer between main and backup power. It is positioned for installations where space is a premium but dependable auto-switching is required for continuous operation of critical loads.
125 Amp 3P Dual Power Automatic Transfer Switch
The 125A, 3P transfer switch is built for larger load centers and offers seamless switching from mains to standby power in industrial, commercial, or residential settings. It features multiple safety protections—insulation, ground protection, and phase loss detection—to mitigate overloads and faults while ensuring reliable power delivery to connected equipment.
Dual Power Automatic Transfer Switch, 2P 63A 110V/50-60Hz
This aluminum-cased 2P 63A switch supports 110V operations with dual power inputs and offers Auto/Manual modes. It includes 50/60Hz compatibility and clear status indicators, promoting straightforward installation and operation for residential or light commercial use where reliable automatic transfer is required.
Buying Guide: Key Considerations for Your Single-Phase ATS
- Voltage and phase compatibility: Ensure the unit matches your system voltage (110V or 220V) and single-phase configuration. Some models support both or are optimized for specific voltages.
- Current rating: Pick a switch with a current rating at or above the maximum load you expect. Common options range from 63A to 125A.
- Transfer speed and mode: Look for automatic switching with a fast transfer time (often 2 seconds or less) and a reliable manual override for control during maintenance or testing.
- Protection features: Prioritize units with short circuit, overload, phase loss, and undervoltage protection to safeguard connected equipment.
- Input sources: Determine whether the device supports mains, generator, photovoltaic, or multiple sources to fit your backup strategy.
- Installation and form factor: Consider whether the ATS is DIN rail mounted, wall-mounted, or uses a metal enclosure for outdoor or indoor settings.
- Indicators and accessibility: Visual indicators (LEDs) help monitor which source is active and troubleshooting status quickly.
- Manual mode and safety: Ensure easy manual operation and locking mechanisms if tamper resistance or safe maintenance is a concern.
- Compliance and warranty: Check for certifications, UL/CSA listings where applicable, and manufacturer warranties for long-term reliability.
- Future expansion: If you anticipate adding more loads or multiple sources, consider higher amperage units or 3P/4P configurations with interlocking features.
When selecting an ATS, balance reliability, speed, and compatibility with your installation environment. For critical loads, prioritize models with proven protection features and fast transfer to minimize power loss. For residential use, DIN-rail or compact enclosures may simplify installation, while larger facilities may require 3P solutions with higher amperage and robust safety interlocks.