Mounting The Dc Disconnect; Inserting The Dc Varistors - SMA SUNNY BOY 3000-US Installation Manual

5 Mounting

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.
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
Figure 11: Position of terminals for the DC varistors
Position
A
1. Open the DC Disconnect (see Section 9.3).
32 SB30-40-US-IA-en-33
Designation
Terminals for DC varistors
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Installation Manual