AB19A Dual Power Automatic Transfer Switch ATS Set Primary&Backup Power 40V DC12-40V 50A Auto ATS Set Main & Backup Power for Marine Off-Grid UPS Marine Telecom Industrial Solar Panel Cam Surveillance

• ULTRA-FAST 40A CONTINUOUS / 50A PEAK DUAL POWER AUTOMATIC TRANSFER SWITCH (12V–72V) – This 40A continuous / 50A peak DC automatic transfer switch (ATS) switches from main to backup power in under 10ms, ensuring uninterrupted power supply (UPS) for critical loads. It acts as a reliable dual battery isolator and voltage sensitive relay for high-power 12V–72V DC systems in telecom, industrial, security, RV, marine, and solar panel applications. Standard 20A switches can't match this 40A continuous / 50A peak capacity.
• DUAL MODE + INTELLIGENT VOLTAGE MANAGEMENT + REAL-TIME MONITORING – Default Mode is plug-and-play: runs on main power and auto-switches to backup below 10V. Custom Mode lets you program switchover and recovery voltages via the SET button, with non-volatile memory. Built-in digital voltage display and LED indicators (MAIN red / BACKUP blue / MODE green) show active source and voltage at a glance. Precise DC power management protects against unstable input and prevents battery discharge between main and backup sources.
• WIDE VOLTAGE & HIGH CURRENT INPUT CONFIGURATION -Both MAIN and BACKUP inputs share identical voltage and current ratings. Available in two models: AB19A supports DC 12–40V; AB19B supports DC 12–72V. Both deliver 40A continuous / 50A peak. Compatible with 12V, 24V, 36V, 48V, 60V, and 72V battery and solar configurations (model dependent). Ideal for RV dual battery setups, marine electronics, telecom power supplies, and 72V electric vehicle battery management. No additional converters required.
• ISOLATION PROTECTION & VERSATILE APPLICATIONS -Built-in isolation protection prevents backfeed between the two power inputs, while isolated input paths prevent batteries from discharging into one another and help extend battery life. Ideal for solar panels, batteries, RVs, marine vessels, surveillance systems, telecom equipment, industrial automation, PLC backup power, security camera backup power, car refrigerators, and communication base stations that need reliable primary and backup DC power switching.
• EASY WIRING, FLEXIBLE MOUNTING & CABLE SPEC -Clearly labeled MAIN, BACKUP, and OUT terminals (2 inputs, 1 output) simplify installation. Supports both DIN-rail and screw mounting, and accommodates 12AWG wire for high-current applications. Required cable spec for Autoro AB19 ATS with supplied metal wiring screws: 12AWG; diameter of cable for each metal screw terminal should be <2.5mm. Screw terminal connections — no soldering required. Compact design integrates easily into existing cabinets, panels, or enclosures.
• IMPORTANT NOTICE BEFORE OPERATION + DIRECT MANUFACTURER SUPPORT – Before connecting any load to the Autoro AB19 DC automatic dual power transfer switch, please follow these steps: (1) Connect one input power source and measure the output voltage to verify it is normal; (2) Connect the second input power source and measure the output voltage again to confirm it is normal; (3) Only after confirming that the output voltage is correct, then connect your load to the output terminal. For technical guidance, contact Zhuhai Baoge Technology Co., Ltd. for direct manufacturer support — we reply within 24 hours.

Autoro AB19 — DC12-72V Input,40A Continuous/50A Peak Outptut High-Current Dual Power Automatic Transfer Switch ATS

Ensure absolute power continuity for your critical DC systems with the Autoro AB19. This professional-grade automatic transfer switch (ATS) delivers seamless ≤10ms changeover between main and backup power sources, providing a true uninterrupted power supply (UPS) solution for high-current applications. Ideal for telecom, industrial, security, RV, marine, and solar panel systems.

CHOOSE THE RIGHT AB19 MODEL — MATCH VOLTAGE AND CURRENT
The AB19 comes in two variants. Both provide 40A continuous / 50A peak and have identical MAIN and BACKUP input ratings — there is no difference between the two input paths. Select based on your system voltage:

• AB19A: DC 12–40V input, Ideal for 12V, 24V, 36V, and 40V nominal systems. Continuous Current: 40A, Peak: 50A.
• AB19B: DC 12–72V input. Ideal for 12V, 24V, 36V, 48V, 60V, and 72V systems. Continuous Current: 40A, Peak: 50A.

For reliable long-term operation, we recommend leaving a safety margin: keep your continuous load below 32–36A (80–90% of the 40A continuous rating) and ensure your system voltage stays comfortably within the model’s range. This helps prevent overheating, extends product life, and ensures stable switching performance.

KEY FEATURES AT A GLANCE
Dual Mode: Default Mode (plug-and-play, auto-switches below 10V) and Custom Mode (program switchover and recovery voltages via SET button, with non-volatile memory).
Real-Time Monitoring: Digital voltage display plus LED indicators (MAIN red / BACKUP blue / MODE green) show active source and voltage at a glance.
Isolation Protection: Prevents backfeed between the two power inputs; isolated paths prevent batteries from discharging into each other, extending battery life.
Wide Compatibility: Works with 12V, 24V, 36V, 48V, 60V, and 72V DC systems (model dependent) without additional converters.

EASY WIRING & FLEXIBLE MOUNTING
Clearly labeled MAIN, BACKUP, and OUT terminals (2 inputs, 1 output) simplify installation. Supports both DIN-rail and screw mounting. Required cable spec: 12AWG; diameter of cable for each metal screw terminal should be