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SMA Backup Select (BU-SLCT-US-50) automatic transfer switch

Model: BU-SLCT-US-50 · SKU: BU-SLCT-US-50

Prepared Nov 12, 2026

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Common specifications

Current rating	Not documented
Voltage rating	Not documented
Poles	Not documented
Operation	AutomaticSource [3]
Input sources	Not documented
Transfer time	Not documented
Enclosure	NEMA Type 3RSource [2]
Safety listing	Not documented
Mounting	Not documented
Weight	6.09 kg13.4 lb convertedSource [2]
Dimensions	236 D × 506 W × 260 H mm9.29 D × 19.9 W × 10.2 H in convertedSource [2]
Enclosure volume	31.05 L** Calculated from recorded external dimensions
Warranty term	Not documented

All recorded specifications

AC frequency	60 HzDocumented claim Conditions The AC grid frequency row. Location: Technical Data, Parallel grid operation The AC grid frequency row. Location: Technical Data, Parallel grid operation Official instruction manual · SMA eManual SMA Backup Select, Technical Data: Parallel grid operation (November 3, 2026 capture) [4]
AC voltage	120 V backup output; 240 V / 208 V grid inputDocumented claim Conditions Backup nominal AC voltage; the grid side is printed on the parallel grid operation page. Location: Technical Data, Automatic backup and Parallel grid operation Backup nominal AC voltage; the grid side is printed on the parallel grid operation page. Location: Technical Data, Automatic backup and Parallel grid operation Official instruction manual · SMA eManual SMA Backup Select, Technical Data: Automatic backup (November 3, 2026 capture)Official instruction manual · SMA eManual SMA Backup Select, Technical Data: Parallel grid operation (November 3, 2026 capture) [3, 4]
Compatible series	SBSE3.8-US-50 to SBSE11.5-US-50Documented claim Conditions The compatible inverters row. Location: Technical Data, Automatic backup The compatible inverters row. Location: Technical Data, Automatic backup Official instruction manual · SMA eManual SMA Backup Select, Technical Data: Automatic backup (November 3, 2026 capture) [3]
Device type	Automatic transfer switching device for single-phase battery backup with the Sunny Boy Smart Energy-USDocumented claim Conditions The function table's Grid Disconnection row. Location: Function of the automatic transfer switching device The function table's Grid Disconnection row. Location: Function of the automatic transfer switching device Official instruction manual · SMA eManual SMA Backup Select, Function of the automatic transfer switching device (November 3, 2026 capture) [5]
Dimensions	236 D × 506 W × 260 H mm9.29 D × 19.9 W × 10.2 H in convertedDocumented claim Conditions With the wall mounting bracket; 226 mm deep without it. Location: Technical Data, General Data With the wall mounting bracket; 226 mm deep without it. Location: Technical Data, General Data Official instruction manual · SMA eManual SMA Backup Select, Technical Data: General Data (November 3, 2026 capture) [2]
Enclosure	NEMA Type 3RDocumented claim Conditions The degree of protection row. Location: Technical Data, General Data The degree of protection row. Location: Technical Data, General Data Official instruction manual · SMA eManual SMA Backup Select, Technical Data: General Data (November 3, 2026 capture) [2]
Operating temperature	-40 to 55 °C-40 to 131 °F convertedDocumented claim Conditions Printed as -40 to +55 °C. Location: Technical Data, General Data Printed as -40 to +55 °C. Location: Technical Data, General Data Official instruction manual · SMA eManual SMA Backup Select, Technical Data: General Data (November 3, 2026 capture) [2]
Operation	AutomaticDocumented claim Conditions The switching mode row. Location: Technical Data, Automatic backup The switching mode row. Location: Technical Data, Automatic backup Official instruction manual · SMA eManual SMA Backup Select, Technical Data: Automatic backup (November 3, 2026 capture) [3]
Weight	6.09 kg13.4 lb convertedDocumented claim Conditions Printed as 6.09 kg (13.4 lb). Location: Technical Data, General Data Printed as 6.09 kg (13.4 lb). Location: Technical Data, General Data Official instruction manual · SMA eManual SMA Backup Select, Technical Data: General Data (November 3, 2026 capture) [2]

Warranty

Certificate records

No records documented.

Sources and revisions

SMA eManual SMA Backup Select, Validity (November 3, 2026 capture)Official instruction manual · Checked Nov 2, 2026https://manuals.sma.de/BU-SLCT-US-50/en-US/14692731147.html
SMA eManual SMA Backup Select, Technical Data: General Data (November 3, 2026 capture)Official instruction manual · Checked Nov 2, 2026https://manuals.sma.de/BU-SLCT-US-50/en-US/15288308747.html
SMA eManual SMA Backup Select, Technical Data: Automatic backup (November 3, 2026 capture)Official instruction manual · Checked Nov 2, 2026https://manuals.sma.de/BU-SLCT-US-50/en-US/15549270411.html
SMA eManual SMA Backup Select, Technical Data: Parallel grid operation (November 3, 2026 capture)Official instruction manual · Checked Nov 2, 2026https://manuals.sma.de/BU-SLCT-US-50/en-US/15635983115.html
SMA eManual SMA Backup Select, Function of the automatic transfer switching device (November 3, 2026 capture)Official instruction manual · Checked Nov 2, 2026https://manuals.sma.de/BU-SLCT-US-50/en-US/14829747083.html