Appendix B
STS/MBS Operation
Copyright © 2008-2010 Eaton Corporation. All Rights Reserved.
IPN 997-00012-68D February 2010
59
Appendix B
STS/MBS Operation
Introduction
The optional Static Transfer Switch (STS) module increases system reliability by providing
automatic switching between the inverter output and the AC mains source. This provides
protection against load interruptions caused by severe overload or inverter system failure.
The optional Maintenance Bypass Switch (MBS) consists of a mechanical switch providing
voltage free system maintenance for the safe removal of inverters or the static transfer switch
without load power interruptions.
The MBS has two main contacts. In the Inverter Bypass or Mains AC Bypass positions, the MBS
main contact2 or the MBS main contact1 will be closed. The inverter or mains AC will then
power the load via directly, so that the STS can be removed without interruption to the load.
For STS specifications refer to STS AC input specifications on page 55 and STS Output
Specifications on page 56
.
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