Fuji Electric FRENIC-Ace series - Connection Example and Criteria for Selection of Circuit Breakers

11.3 Molded Case Circuit Breaker (MCCB), Residual-current-operated Protective Device
(RCD)/Earth Leakage Circuit Breaker (ELCB) and Magnetic Contactor (MC)
11-9
SELECTING PERIPHERAL EQUIPMENT
Chap 11
11.3.2 Connection example and criteria for selection of circuit breakers
Figure 11.3-1 shows a connection example for MCCB or RCD/ELCB (with overcurrent protection) and MC in the
inverter input circuit. Table 11.3-1 lists the rated current for the MCCB and corresponding inverter models. Table
11.3-2 lists the applicable grades of RCD/ELCB sensitivity.
Insert an MCCB or RCD/ELCB (with overcurrent protection) recommended for each inverter for its input circuits.
Do not use an MCCB or RCD/ELCB of a higher rating than that recommended.
Doing so could result in a fire.
Molded case circuit breaker or
residual-current-operated protective
device/ earth leakage circuit breaker
Magnetic contactor
Figure 11.3-1 External Views of MCCB or RCD/ELCB and MC and Connection Example
Molded case circuit breaker
(MCCB)
or residual-current-operated
protection device (RCD)/earth
leakage circuit breaker
Magnetic contactor
Three-phase
power supply
200 to 240 V
50/60 Hz or
three-phase
power supply
380 to 480 V
50/60 Hz
*: With overcurrent protection
Inverter