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78 SB20_25_30HF-IEN102911 Installation Guide
5. Insert an insertion tool into the openings of the
terminal contacts (1).
☑ The terminal clamps loosen.
If you do not receive an insertion tool for operating
the terminal clamps with your replacement
varistors, contact SMA Solar Technology AG. As
an alternative, the individual terminal contacts can
be operated using a 3.5 mm wide screwdriver.
6. Remove the varistor (2).
7. Insert new varistor (1).
The pole with the small loop (crimp) must be fitted
to terminal A when replacing the varistor.
8. Bend new varistor upwards (2).
NOTICE!
Destruction of the inverter by DC overvoltage.
If varistors are missing, the inverter is no longer protected against DC overvoltages.
•Do not operate the inverter without varistors in plants with a high risk of DC
overvoltages.
• Replacement varistors should be obtained as soon as possible.
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