Wiring details
WARNING: If installing a PV system using TRIO in North America, verify that the selected PV
module is listed for use in 1000Vdc systems in accordance with local electrical codes.
It is the responsibility of the installer to provide external disconnect switches and Overcurrent
Protection Devices (OCPD) as required by National Electric Codes and other prevailing regula-
tions.
• An automatic overcurrent device (e.g., circuit breaker) must be installed between the TRIO
inverter and the AC utility grid.
• The –S1B version includes an integrated fused AC disconnect switch in the wiring box;
however, because this switch is behind the front cover it is intended as an equipment
disconnecting means and may not be accepted by the authority having jurisdiction (AHJ) in
lieu of an external disconnect. It is made available as an additional disconnect for cases where
the AHJ may require disconnects at both ends of the inverter AC line. Before purchasing this
inverter option, consider discussing its intended usage with the AHJ in question.
• The TRIO is designed without an isolation transformer and is intended to be installed per
NFPA 70, 690.35 with an ungrounded PV array.
AC overcurrent protection
To protect the AC connection line of the inverter, ABB recommends the following characteristics
when installing a device for protection against overcurrent:
TRIO-20.0-TL US TRIO-27.6-TL US
Type Typical installations use a 3-pole/600V rated bi-directional thermal-
magnetic circuit breaker, UL489 or equivalent.
Maximum
Current/
Voltage
40A/600V 50A/600V
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