In-Rush Current - Why Add Fuses Before Outputs

The output mosfet's from the supervisor cannot handle a large inrush surge current when first switching on the load (fan). We had designed it with the view of small loads. The typical inrush current is X4 times the rating far beyond the capability of the supervisor. Whilst the surge is only for micro/milliseconds its still too much for too long for the FET's.

Inrush_Current_into_HVDC_Capacitor.JPG

By adding the fusing, you prevent these surges causing damage and it protects your WatchMon.

Ratings of Outputs for Various Boards

WatchMon 4

  • 2 digital switched mosfet outputs (3A/48V)

WatchMonPlus

  • 2 digital switched mosfet outputs (3A/48V)

Expansion Board 12V

  • 6 digital switched mosfet outputs 4A (switched +ve 12v)
  • 4 relay outputs (30Vdc 5A) cont (10A peak)

Expansion Board 48V

  • 6 digital switched mosfet outputs 1.5A (switched +ve 48v)
  • 4 relay outputs (30Vdc 5A) cont (10A peak)

Expansion Board 2

  • 2 relay outputs 5A/30VDC
  • 2 Solid State relay outputs  2A/60VDC
  • 6 digital switched mosfet outputs (3A/48V)

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