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SKRU Wiring
If the Wall Mount MBS is equipped with a SKRU (Solenoid Key Release Unit) it comes with the SKRU factory-wired to the
MBS Terminal Strip TB-1. TB-1 is mounted on the lower left side of the MBS.
Complete wiring the MBS TB-1 SKRU to the UPS dry contacts TB before energizing the MBS or UPS. The SKRU is pow-
ered from the load side of the MBS output breaker.
Connect one end of the user-supplied 16-18 Gage twisted pair wiring to MBS TB-1 terminals 1 and 2. Connect the other
end to the UPS "Bypass Enable" dry contact TB terminals. See the figure below.
MBS
* MBSWH-xxx-F3-KS: 120V
MBSWH-xxx-S3-KS: 24V
4200FA TB2-11
4200FA TB2-12
4300 TB3-1
4300 TB3-2
4400 TB3-1
4400 TB3-2
G8000 TB1-10
G8000 TB1-11
G9000 (100-750kVA) IOAU-09 TN2-19
G9000 (100-750kVA) IOAU-09 TN2-20
G9000 (1000kVA) IOAU-19 TN21-25 - 19
G9000 (1000kVA) IOAU-19 TN21-25 - 20
LOCK-OUT/TAG-OUT OPTION
An optional pair of tabs can be easily attached to the MBS door and frame to satisfy applications that
require Lock-out/Tag-out capability. Call the factory for additional information.
MBS (Wallmount) Installation - 64523-009
SKRU
DC
Figure 2 - MBS Wiring for SKRU
Table 5: SKRU Point to Point Wiring
From UPS Model Terminal Board
TB 1
1
2
L
End User Supplied Wiring
AC
(16-18 gage twisted pair)
UPS
Bypass Enable
TB
To MBSWH Terminal Board
MBSWH TB1-1
MBSWH TB1-2
MBSWH TB1-1
MBSWH TB1-2
MBSWH TB1-1
MBSWH TB1-2
MBSWH TB1-1
MBSWH TB1-2
MBSWH TB1-1
MBSWH TB1-2
MBSWH TB1-1
MBSWH TB1-2
7
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