Power Electronics NB WALL Series - Overcurrent and Short Circuit Protection; Residual Current Monitoring (RCM); Charge Circuit Interrupting Device (CCID)

NB Wall
POWER ELECTRONICS
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PROTECTIONS
PROTECTIONS
The NB Wall EV charger may include different hardware protections depending on the model and options
selected. This section describes the different protections.
Overcurrent and short circuit protection
The IEC chargers include a differential switch (RCD) in each line and whose characteristics are as
follows:
DIFFERENTIAL SWITCH
Type
Nominal
current
(I
n
)
Nominal voltage
(U
n
)
Differential
protection
RCD - IEC
Type A / 4P
40A
400V
AC
30mA
The NB Wall, in both IEC and US, can have an extra option: a miniature circuit breaker (MCB) for
each hose. Its main features are shown in the following table:
CIRCUIT BREAKER
Type
Nominal
current (I
n
)
Nominal
voltage (U
n
)
Breaking
capacity (kA)
MCB - IEC
4P
40A
400V
AC
6kA
MCB - US
2P
40A
240V
AC
10kA
The NB Wall - Professional (IEC) model can include as option a type A RCD resetting accessory.
Residual current monitoring (RCM)
The NB Wall - Professional (IEC) equipment includes a residual current monitor (RCM) , while the NB
Wall - Advanced - IEC equipment can include it as an extra option. This element monitors for any
leakage current in excess of the operational limit in the AC charging hose; if detected, it provides a fault
signal that will stop the charge.
Operational limit
RCM
6mA
DC
Charge circuit interrupting device (CCID)
In case of US equipment, those include a charge circuit interrupting device (CCID) for AC charging. This
element monitors all currents between phase and neutral; when applicable, it will provide a fault signal
that will stop the charge. It includes an integrated differential element.
Operational limit
CCID
56mA
DC
/ 20mA
AC
NOTICE
Any protection required by regulations and not included in the equipment must be installed
externally.
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