Outback Radian GSLC Planning Guide

Page 12
900-0222-12-00 Rev A
©2019 OutBack Power Technologies. All Rights Reserved.
Page 13
Bypass Switches
Inverter systems are often equipped with maintenance bypass switches or interlocks. If the inverter
system ever needs to be shut down or removed, its AC sources and loads must be disconnected.
A bypass device allows the AC source to “bypass” the inverter and deliver power directly to the loads.
This can minimize disruption to the system and it avoids the need for extensive rewiring.
WARNING: Shock Hazard or Equipment Damage
 Bypassing multiple sources will usually connect the sources to each other, which may damage one or both sources. It can
otherwise result in power being routed to inappropriate places.
 The bypass assembly does not disconnect the inverter’s AC input.
 Even with the inverter bypassed, any AC input source may be a shock hazard unless disconnected.
In the illustration below, when Switch 1 is on (normal operation), the inverter’s output sends power to the
loads. Switch 2 is off, preventing the inverter from sending power back to the AC source (backfeeding).
When Switch 2 is on (bypass operation), the AC source sends power directly to the loads. Switch 1 is
off, removing the inverter’s output from the loads. This also prevents the AC source from backfeeding
the inverter. With the inverter removed from the circuit, maintenance can be performed as necessary.
The GSLC can be ordered with bypass circuit breakers for this purpose, or it has a bypass option
(the GS-IOB-120/240VAC or GS-IOB-230VAC) which can be installed.
Bypass Switches
Switch 2
Switch 1
Mechanical
Interlock
The inverter may use an
AC source which powers
the inverter’s output.
The bypass assembly
does not disconnect the
inverter’s input.
Inverter Output
Bypass AC
Source
AC Loads
Switch 1 and Switch 2 are prevented from
being on at the same time by the Mechanical
Interlock. Although both switches can be off,
only one can be on.
In OutBack bypass assemblies, circuit breakers
are used instead of standard switches.
AC
AC Loads
GSLC
Disconnected
Radian
Inverte
r
Input Output Wiring
Notes