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Installing and selecting an external RCD circuit breaker
Residual current device (RCD)
• Installations where local electrical codes require an RCD circuit breaker with a
lower leakage current rating may result in the external RCD circuit breaker being
accidentally tripped due to the discharge current. The following steps are
recommended to avoid unwanted tripping of the external RCD circuit breaker:
However, the inverter automatically resets when the fault currents
are low, manual reset can be saved.
Speed 300mA per unit.
1. Selecting a suitable RCD circuit breaker is important for the correct operation
of the system. An RCD circuit breaker rated at 30mA
can trigger with a leakage current of 15mA (according to IEC 61008).
• In some countries an external RCD circuit breaker is required. The installer must
check which type of RCD circuit breaker is available in the respective local area
• All a-TroniX inverters are equipped with a certified internal residual current
protective device (RCD) that protects against a possible malfunction in the event
of a malfunction of the PV generator, cables or inverter (DC).
High-quality RCD circuit breakers usually trip at a value that
regulations are required. The installation of an RCD circuit breaker must
is closer to its nominal value.
Protects against electric shock. The residual current protection device in the a-
TroniX inverter can detect leaks on the DC side. There are 2 trigger thresholds for
always be carried out in accordance with local regulations and standards.
2. Configure the trip current of the internal RCD circuit breaker
the FI circuit breaker, as required in the DIN VDE 0126-1-1 standard. A low one
a-TroniX recommends using a type A RCD circuit breaker. a-TroniX
Inverter to a lower value than the tripping current of the external RCD circuit
breaker. The internal RCD circuit breaker trips when the
recommends an RCD circuit breaker with a value between 100mA and 300mA,
Threshold serves to protect against rapid changes in leakage, as in
Current exceeds the permissible value. Because the internal RCD circuit breaker
unless local regulations require a lower value.
occur when people come into direct contact. A higher threshold is used for slowly
increasing leakage currents to reduce the current in grounding conductors
to limit security. The default value for higher speed personal protection is 30mA
and lower for fire protection
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