Skip to content

DC Secondary Power Distribution

Secondary Power Distribution Unit

Lightweight and Flexible

The DC Secondary Power Distribution Unit (SPDU) is an aerospace and mil-spec electronic circuit breaker system that leverages digital communications and the use of solid-state technology to develop a highly configurable, rugged, flexible and lightweight power distribution system for today's modern jets, helicopters, UAVs, eVTOL and armored tactical vehicles. Our proven SPDU system design uses less cockpit panel space and reduces wiring and circuit breaker requirements for lower overall system weight and more space for other equipment.

Designed to provide circuit and wiring protection, our SPDU also offers built-in advanced convenience and safety features. The system has configurable arc fault protection, pulse width modulation, remote load power control, load power monitoring, automated load shedding, and other prognostic and diagnostic maintenance activities.

Our SPDUs are available in single and dual-channel versions. Both are capable of distributing up to 144A of DC current per channel continuously at up to 70° C and can be configured with up to 27 power outputs per channel, each protected by independent Solid State Power Controllers (SSPCs).

Reduce Aircraft Wiring

Using a distributed power control system greatly reduces the amount of wiring needed since each wire is not required to route to a centralized location. Reducing the wire runs simplifies installation, saves weight, and increases power system reliability.

Arc Fault Detection

Our technology solutions sensing capability can also be used to trip on intermittent arc faults produced by wire insulation failure. The arc fault sensing is designed to recognize the unique signature of an arc without tripping on turn-on transients from motors, lamps, etc. The ability to detect arc faults is an added feature that increases safety in aircraft power distribution and complies with new certification requirements.

Unique Failsafe Design

Unlike other solid-state products, the SPDU contains patented circuitry that prevents a failure in a short-circuited condition. This means that a failure will not cause a critical load to remain powered in an unprotected and uncontrolled manner. 

Features and Benefits:

  • Certified on over 25 civilian and military, fixed wing and rotorcraft applications
  • Up to 30% reduction in system weight through the absorption of other system functions
  • Reduced pilot workload by automated load shedding and conditional control logic
  • DAL A (flight critical) hardware and software
  • Tested to MIL-STD-461E HIRF standards to Army and Navy limits
  • Detects arc faults and offers patented fail open technology
  • RTCA DO-178 Level A qualified Logic Designer visual-interface software tool for easy setup and system changes
  • Vibration certified for fixed wing, turbo jet, turbo prop, helicopter and aircraft / ground vehicle gunfire
  • No external cooling system needed
  • Submersible up to 39.2" (1 m)
  • Channel paralleling for higher current loads
  • Customizable trip-curve tailoring
  • Solid-state speed and reliability for advanced wire protection
  • Ability to modulate outputs for utility control (speed, lighting, heating)
  • Discrete inputs for load control and data acquisition
  • Steady-state current: Up to 288A
  • Solid-state power controllers: Up to 54 
For additional specs, view the data sheet below.
Contact us for more information or to schedule a demo! 
  • Datasheet +