Specifications

February 2007
16-12
For more information visit: www.eaton.com CA08101001E
Transfer Switches
16
Transfer Switch Equipment
General Description — Maintenance Bypass Switch
Maintenance Bypass Switches
Type MBHE 100 – 1000 Amperes
Type MBHE Maintenance Bypass Switch
General Description
Eaton’s Cutler-Hammer Maintenance
Bypass Switch is a UL 1008 listed
device that provides a simple and
effective means for bypassing un-
interruptible power supplies while
maintaining continuity of power to
the critical computer loads. A mainte-
nance bypass switch is a requirement
on every UPS installation in order to
accommodate the maintenance and
testing of the UPS system.
Features
■ UL 1008 listing — File E61639.
■ Make-before-break electrical
operation.
■ Lockout circuit to be wired into
the UPS bypass authorization.
■ Pilot devices to show UPS position
“Normal” and “Bypassed.”
■ Pilot device to show “Lockout”
enabled.
■ Reliable manually initiated electrical
operation.
■ High interrupting ratings are standard.
■ Molded case switch designs are
available.
■ Solid neutral connections
are standard.
Benefits
■ Safe and reliable operation is
ensured due to the simple and
durable switching design.
■ Unauthorized bypass is prevented
by the need of UPS system to send
the bypass authorized signal.
■ 100% current ratings makes selec-
tion to the UPS kVA ratings easy
to accomplish.
■ Use of interrupting rating switches
makes the maintenance bypass
switches adaptable to systems with
high levels of available fault current.
Figure 16-8. Single Line Diagram of
Maintenance Bypass Switch
Layout Dimensions
Manual Transfer and Maintenance Bypass Switches
100 – 150 Amperes Type MTHXFD Manual /100 – 1000 Amperes Type MBHE Maintenance Bypass
Table 16-16. Manual and Maintenance Bypass Enclosures — Dimensions in Inches (mm)
Figure 16-9. Manual and Maintenance Bypass Switches — Dimensions in Inches (mm)
U
P
S
S
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ste
m
L
oc
k
out
C
ir
cu
i
t
Com
p
ute
r
L
oads
U
P
S
In
p
ut Breake
r
Incomin
g
fr
o
m
S
wi
tc
h
boa
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M
a
in
te
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a
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B
yp
as
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S
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tch
Amperes Dimensions
ABCDE F GH
100 – 150 22.88
(581.2)
13.13
(333.5)
22.74
(577.6)
22.62
(574.5)
24.50
(622.3)
9.78
(248.4)
10.28
(261.1)
32.31
(820.7)
225 – 300 38.88
(987.6)
29.13
(739.9)
35.74
(907.8)
35.62
(904.7)
37.50
(952.5)
17.28
(438.9)
17.78
(438.9)
55.81
(1417.6)
400 38.88
(987.6)
29.13
(739.9)
35.74
(907.8)
35.62
(904.7)
37.50
(952.5)
17.28
(438.9)
17.78
(438.9)
55.81
(1417.6)
600 38.88
(987.6)
29.13
(739.9)
49.74
(1263.4)
49.62
(1260.3)
51.50
(1308.1)
17.28
(438.9)
17.78
(438.9)
55.81
(1417.6)
800 38.88
(987.6)
29.13
(739.9)
49.74
(1263.4)
49.62
(1260.3)
51.50
(1308.1)
17.28
(438.9)
17.78
(438.9)
55.81
(1417.6)
1000 38.88
(987.6)
29.13
(739.9)
59.74
(1517.4)
59.62
(1514.3)
61.50
(1562.1)
17.28
(438.9)
17.78
(438.9)
55.81
(1417.6)
A
B
5
.
00
(
127.0
)
E
C
D
H
1.2
5
(
31.8
)
F
G
1.7
5
(
44.5
)
2.00
(
50.8
)
Latch O
p
en
.75
(
19.05
)
L
atc
h
C
l
osed