1-6.
Circuit Protection Parts
1-6-1.
Circuit Protection Element
This unit is equipped with positive-characteristic thermistors (power thermistors) as circuit protection elements.
The positive-characteristic thermistor limits the electric current flowing through the circuit as the internal resistance
increases when an excessive current flows or when the ambient temperature increases.
If the positive-characteristic thermistor works, turn off the main power of the unit and inspect the internal circuit of the
unit. After the cause of the fault is eliminated and the positive-characteristic thermistor is cooled down, turn on the main
power again. The unit works normally. It takes about one minute to cool down the positive-characteristic thermistor
after the main power is turned off.
Board
Ref. No.
LE-411
TH001
TH002
SW-1705
TH002
HDC-P43
Address
Part No.
B1 (side A)
1-802-063-21
!
B1 (side A)
1-802-063-21
!
A2 (side A)
1-802-108-11
!
Holding Current
1.10 A/20 °C
1.10 A/20 °C
1.50 A/20 °C
1-15