Version 1, 2023-10-20
Author:
Klaudia Kostogłód

Introduction

The residual-current circuit breaker (RCD) is used for supplementary protection against
electric shock. According to IEC 61851, charging stations must be protected by
a residual-current circuit breaker, which is often mounted inside the charger. In this case, lifting
the lever of the circuit breaker, which has tripped due to the occurrence of residual current,
often involves a service trip, since disconnecting the power supply makes it impossible to
disconnect the charging cable. A dedicated automatic reclosing device mounted at the
RCD B device allows the circuit breaker to be lifted automatically, so physical presence at the
station is not required. The subject of this document is the installation and modes of operation
of the RCD with automatic reclosing device on Enelion chargers.

Installation of the automatic reclosing device

The RCD B system with automatic reclosing device comes in single-phase and three-phase
versions. The automatic reclosing device is a separate, physical device that is mounted on
a DIN rail and must be mounted next to the circuit breaker. Depending on the number of
phases, the circuit breaker system with automatic reclosing device occupies 4 or 5 modules
on the DIN rail and can be mounted on Enelion's Wallbox and Vertica chargers. The power
supply to the automatic reclosing device should be supplied before the RCD B power
supply so that it is not turned off when RCD B trips.

Fig. 1. Connection diagram of the RCD B with automatic reclosing device to the power supply

Fig. 2. Dimensions of three-phase RCD B device with automatic reclosing device

Fig. 3. Dimensions of RCD B single-phase device with automatic reclosing device

Automatic reclosing device interface

Fig. 4. Automatic reclosing device interface

The LED located on the automatic reclosing device indicates the status of the device:
1. Solid green indicates that the device is ready for operation.
2. Continuous red means that the device is blocked, after 3 unsuccessful attempts to lift.
In this case, it is required to be present at the station and raise the lift manually.
3. Flashing red indicates that the automatic reclosing device is attempting to raise the
residual-current circuit breaker lever.

RCD operation with an automatic reclosing device

The automatic reclosing device can operate in three modes:
● Auto - a mode in which the automatic reclosing device makes up to 3 attempts to lift
the RCD, if needed:

1. The first attempt is made 10 seconds after the residual-current circuit breaker
is tripped.
2. If the residual-current circuit breaker is tripped again within 15 minutes, the
automatic reclosing device will make a second lift attempt after 1 minute.
3. If the residual-current circuit breaker is tripped again after less than 15 minutes,
the automatic reclosing device will make a third lift attempt after 5 minutes.

The fourth trip of the residual-current circuit breaker disables the operation of the
automatic reclosing device. At this point, physical servicing of the station is required.

This process is shown in schematic form in Figure 5.

Fig. 5. diagram of the cycle of lifting the lever of the residual-current circuit breaker.

● Manual - standard operation of the residual current circuit breaker. After tripping, RCD
B requires manual lifting.

● Lock - protection against unauthorized access. Once the automatic reclosing device is
set in this mode, a seal can be applied to prevent unauthorized persons from changing
the mode of operation of the automatic reclosing device.