Onboard Power Supply A4(400S50,930g)

Customized for DJI M400 Series Drone Onboard Modules

The module has been upgraded from the first generation to the third generation, with enhanced heat dissipation.

Product Model: AF-400S50-4K

Compatible Tethered Boxes: G4, G7

Dimensions: 159mm × 93mm × 58mm (Length × Width × Height)

Weight: 930g ± 10g

Power: Max 4000W

Input: 340-450Vdc

Output: 43-56Vdc

Note: Single module can be paralleled to increase power.

Caution: Must be used in parallel with a battery.

The power supply features output overcurrent protection, output short-circuit protection, output overvoltage protection, and over-temperature protection.

Founded in 2018, Airfly Tethered is a national high-tech enterprise specializing in the research, development, and manufacturing of tethered UAV power systems. As one of Jiangsu Province’s leading intelligent manufacturing companies, Airfly is dedicated to advancing tethered technologies that enable safe, efficient, and continuous drone operations.

Based in Nanjing, China, Airfly collaborates with domestic and international partners to provide high-quality, high-performance tethered modules and power stations for UAV applications worldwide.
Our flagship products include the A4, WF4, and FW6 airborne power modules (6kW, compatible with 750V ground stations), and the G4 and G7 ground tether power stations (7kW / 750V)—widely recognized as reliable, market-proven solutions.

Driven by the philosophy of “Technology Empowers, Innovation Leads,” Airfly partners with renowned universities such as Nanjing University, Southeast University, and NUIST, forming a strong R&D team with cutting-edge expertise. We not only deliver industry-leading standard products but also provide customized non-standard tethered solutions to meet clients’ specialized needs.

Airfly Tethered serves over 600 domestic and 80 international clients, with exports to the U.S., Europe, the Middle East, South Africa, and Southeast Asia. Our tethered systems play critical roles in power inspection, communications, monitoring, emergency response, firefighting, and security.

Looking ahead, Airfly will continue to expand the boundaries of tethered UAV applications, creating greater value for customers worldwide and powering the future of intelligent aerial operations.

Original Innovation — Confident Tethering Since 2013

Phone: +86 19952400441 / +86 199 5178 6845

WhatsApp: +86 199 5240 0441

Email: susy@tetheredsystem.com / evan@tetheredsystem.com

Address: Room 1813, Building C, No. 88 Pubin Road, Pukou District, Nanjing, China

Website: www.tetheredsystem.com