5 Mounting SMA America, LLC
32 SB30-40-US-IA-en-33 Installation Manual
5.6 Mounting the DC Disconnect
5.6.1 Inserting the DC Varistors
To protect inverters with an arc-fault circuit interrupter from overvoltage, the provided DC varistors
must be inserted into the intended terminals prior to mounting the DC Disconnect.
Figure 11: Position of terminals for the DC varistors
1. Open the DC Disconnect (see Section 9.3).
Only the following Sunny Boy device types are equipped with an automatic arc-fault circuit
interrupter (AFCI):
• SB 3000-US-12
• SB 3800-US-12
• SB 4000-US-12
Position Designation
A Terminals for DC varistors
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