11.3 Peripheral Equipment
11-17
Chapter 11 SELECTING PERIPHERAL EQUIPMENT
Table 11.3-1 Molded Case Circuit Breaker (MCCB), Residual-Current-Operated Protective Device (RCD)/Earth
Leakage Circuit Breaker (ELCB), Magnetic contactor (MC)
HD (High Duty) mode: Heavy duty load applications
LD (Low Duty) mode: Light duty load applications
Note: A box () in the above table replaces an alphabetic letter depending on the enclosure.
S (Basic type), E (EMC filter built-in type), H (DC reactor built-in type)
• Install the MCCB or RCD/ELCB at the input side of the inverter. They cannot be installed at the output
side of the inverter.
• The above table lists the rated current of MCCBs and RCD/ELCBs to be used in the power control
panel with an internal temperature of 50°C or lower. The rated current is factored by a correction
coefficient of 0.85 as the MCCB’s and RCD’s/ELCB’s original rated current is specified when using
them in a surrounding temperature. Select an MCCB and/or RCD/ELCB suitable for the actual
short-circuit breaking capacity needed for your power systems.
• When selecting an MC, the HIV wire (capable of 75°C) is assumed. If an MC type for another class of
wires is selected, the wire size suitable for the terminal size of both the inverter and the MC type should
be taken into account.
• Use ELCBs with overcurrent protection.
• To protect your power systems from secondary accidents caused by the broken inverter, use an MCCB
and/or RCD/ELCB with the rated current listed in the above table. Do not use an MCCB or RCD/ELCB
with a rating higher than that listed.
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