Liebert micro smart switch user manual General Description, Glossary of Symbols

General Description

The Liebert Micro SmartSwitch (MSS) is a single Phase Dual Input rack mount- able Power Distribution Unit (PDU) with a built in Automatic Transfer Switch. When Input A falls below 168 VAC and Input B is valid, the output is automati- cally transferred to Input B. The output is transferred back to Input A when Input A is valid and rises above 178 VAC. This high speed transfer rate ensures that the transfer is transparent to the sensitive equipment.

The two sources are not required to be in phase. This is an effective solution that builds in redundancy and increases the AC power availability of connected equipment. If the dual input power is fed through two independent AC sources, then the system availability is increased and the dual input advantages are fully used.

The Micro SmartSwitch provides 12 receptacles that distribute redundant AC power and may be rack mounted. There are four groups of three IEC-320 (10A) receptacles, where each group is backed up by a 10A magnetic circuit breaker. The MSS has two attached line cords that are terminated with NEMA L6-30 plugs with a 20A fuse for each. The total load for the MSS cannot exceed 24A of AC load at 200-240 VAC. Also the load for each of the four groups cannot exceed 10A or the internal breaker may trip or the fuse will blow. The load must be balanced among the four segments such that the total current draw per section does not exceed 10A and a total of 24A for all the four segments of the MSS. This product provides line-to-line surge protection of 500 Joules.

Glossary of Symbols

!

I

O

Risk of Electrical Shock

Indicates Caution - followed by important instructions

Bonded to Ground

AC Voltage

On

Off

No user servicable parts inside

DISCONTINUED

PRODUCT