Hitachi APCQ - Thermal Cutoff Switch

APCQ CAPACITOR BANKS
STATUS
Approved
SECURITY LEVEL
Public
DOCUMENT ID
9AKK107680A4136
RE V.
E
LANG.
en
PAGE
14/47
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Important note: auxiliary power supply is included by default in the APCQ capacitor bank, there is no need to provide
an external power supply.
4.6. Thermal cutoff switch
Each APCQ capacitor bank cubicle includes a temperature-sensitive switch that trips the controller power supply
(hence RVC/RVT controller will be off) in case of over temperature above 60°C (or 140°F) inside the enclosure. In
such event, all the capacitors are switched off while fans keep running. Thermal cutoff switch automatically closes
when temperature goes down to normal conditions.
DANGER: When the thermal protection switches on, RVC/RVT controller is off but the capacitor bank is still
connected to the power supplies. See safety instructions and wait 5 minutes before the opening.
Figure 11: Thermal cutoff switch
Figure 12: Location of thermal cutoff switch in APCQ-L