Relay Panels & SSPC

Applications :


Key features & design strategies :

  • Highly integrated designs for significant weight and volume savings.
  • AC and DC secondary distribution utilizing electromechanical and/or solid state power switching devices
  • High integration of current sensing functions
  • Assemblies and subassemblies designed as LRUs for ease of replacement
  • Modular concepts for flexibility, reduced cost, easy reconfiguration and future requirements
  • Distributed or integrated architecture to optimize electrical power system performance, safety and reliability
  • Strategically integrated connections to associate secondary distribution assemblies with primary distribution assemblies
  • Choice of technical solutions based on standard circuit breakers or solid state power controllers

Advanced features for relay panels include :

  •  Full integration of hermetically sealed relays onto a PCB
  • 2A-, 5A-, 10A- and 25A- ratings ; low level to 110VDC network voltage
  • 1-, 2-, 3-, 4-, or 6-pole relays
  • Sockets available for easy relay removal
  • Use of separated transient suppression devices (PCB mounting or plug-in sockets) and other electronic components (e.g. diodes)
  • Time delay relay integration (PCB mounting or plug-in sockets)
  • Flexible technical approach allows for easy change or modifications of schematics
  • Relay panels designed as LRUs for ease of replacement

Additional features for circuit breaker panels include :

  • Fully integrated circuit breakers on panels for space and weight savings
  • Panel plug-in concept to the primary distribution or separated panels for cockpit installation
  • PCB plug-in circuit breakers for cost reduction and easy maintenance
  • Circuit breaker status reporting using communication buses such as CAN, ARINC, or others


Advanced electronic features for SSPCs include :


  • "Design-to-safety" electronics i.e., optimized architecture to achieve the safety objectives of the equipment specifications
  • BITE features such as Fully Automatic Power On Built-in-Test (PBIT), Continuous Built-in-Test (CBIT) and Initiated Built-in-Test (IBIT)
  • Accurate I²t over-current and short circuit protection with thermal memory and fully compliant (or better than) thermal circuit breaker trip curve
  • Reprogrammable trip curves
  • Various communication buses (ARINC 429, CAN, RS422/485, MIL-STD-1553, Ethernet buses, etc.) for internal use, and for communication with man/machine interface, aircraft central computer, and other aircraft equipment
  • Load reporting and management such as load shedding, soft start for specific loads (light), and current measurement
  • Zero voltage turn-on and turn-off (AC device)
  • Synchronization between 3 phases for AC SSPCs (any phase trip will trip all phases)
  • Current threshold and delay for actuator overload protection
  • Programmable time delay on operate or release
  • Fail-safe functions
  • Optional arc fault detection
  • Very low heat dissipation using solid state technology
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