PowerGuard-A 380 VAC–28 VDC Military AC-DC Converter & Distribution System — 1–4 kW

The PowerGuard-A 380 VAC–28 VDC Military AC-DC Converter & Distribution System (product code 3PAC-DC-1000-28) is a three-phase power conversion and intelligent power management system developed by TEDEG Defence for demanding field, vehicle and outdoor operations.

It works in two stages. First, it rectifies a 360–440 VAC three-phase input into a stable high-voltage DC bus of 500–800 VDC. It then converts that bus into a regulated low-voltage output. On this model the nominal output is 28 VDC, with power classes of 1, 2, 3 or 4 kW. The wider PowerGuard-A Series also supports 12 / 24 / 28 / 36 / 48 VDC output configurations on the same hardware platform.

PowerGuard-A is not only a converter but also a power distribution and control hub. Each output channel can be monitored and controlled through optional Ethernet, RS-485 or CAN-Bus interfaces, with real-time reporting of voltage, current, temperature and system health.

AC input (three-phase):

28 VDC output stage:

Programmable output behaviour: Outputs can be sequenced, current-limited, soft-started, time-delayed and protected against over- and undervoltage. Every programmable parameter is accessible through the communication interfaces.

Remote monitoring and control (optional):

• Ethernet: TCP/UDP-based protocol
• RS-485: Modbus or custom protocol
• CAN-Bus: J1939 / CANopen-style messaging
• Telemetry: Voltage, current, temperature, DC bus and system faults
• Remote functions: Output ON/OFF, fault reset, sequencing, channel enable/disable

Electrical interface (MIL-DTL-38999 connectors):

Mechanical and environmental design:

• IP67 sealed aluminium enclosure: Monolithic chassis with no air or moisture ingress, protected against mud, dust, rain and salt fog.
• Fanless, conduction-cooled: No fans, vents or moving parts. Heat passes through the enclosure directly into the host platform structure, giving silent operation.
• Shock and vibration: Designed to MIL-STD-810H shock and vibration profiles for armoured vehicles, naval systems and field equipment.
• Main dimensions (mechanical drawing): 205 × 440 × 109 mm

• Military and tactical vehicles: Stable DC from onboard three-phase AC sources for communication electronics, weapon systems, mission computers, EO/IR payloads and auxiliary subsystems
• Mobile command, radar and communication nodes: Radio transceivers, radar processors, network routers, surveillance suites and tactical communication shelters
• Field power distribution and energy modules: Integration into outdoor enclosures or modular power cabinets to supply sensors, surveillance networks and distributed electronic loads
• Naval, marine and offshore platforms: Sealed power conversion for shipboard electronics, surface vessels, unmanned surface vehicles (USV) and dockside support units
• Rugged industrial and emergency power systems: Remote monitoring stations, shelters and industrial automation that need sealed, silent, maintenance-free conversion

PowerGuard-A combines three-phase AC-DC conversion, multi-channel DC distribution and remote management in a single IP67 enclosure. The fanless, fully sealed design removes maintenance jobs such as filter cleaning and fan replacement in dusty, humid field conditions. Redundant components, a wide thermal margin and a rugged mechanical structure are designed around a 24/7 duty profile. Programmable sequencing and time delays mean loads with high inrush currents do not all switch on at once.

For 24 VDC / 1 kW from a single-phase AC source, see the PowerGuard-A1000 AC-DC converter; for multi-output 28 VDC distribution from 230 VAC, see the PowerGuard TPS-28 Power Management Unit.

Corporate assurance: TEDEG Defence is an approved supplier of ASELSAN, Roketsan and the Turkish Ministry of National Defence (MSB), with NATO supplier registration under NCAGE: TM885.