Specifications

40 Distribution Products Catalog CA08101001E—October 2010 www.eaton.com
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16.3
Tr a n s f er Switches
Breaker-Based Designs
Catalog Number Selection
Transfer Switch Equipment
Technical Data and Specifications
Maintenance Bypass Switch
Standard Withstand, Closing and Interrupting Ratings

Notes

Tested in accordance with UL 1008.

For maximum breaker rating in circuits where the transfer switch is evaluated as a “motor branch circuit conductor” refer to the NEC
®
Section 430-25 for sizing.

Also can use Class RK5 fuse with 100 kA rating.
To attain the maximum rating shown in the chart, when protected by an upstream breaker,
the upstream device must have an equivalent interrupting rating.
Transfer Switch
Ampere Rating
Rating When Used with Upstream Circuit Breaker Rating When Used with Upstream Fuse
Suggested Breaker Rating

240V 480V 600V Maximum Fuse Rating Fuse Type 480V
100 100 100 65 25 200 J, T 200
150 150 100 65 25 400 J, T 200
225 225 100 65 25 400 J, T 200
300 300 100 65 25 400 J, T

200
400 400 65 35 25 600 J, T 200
600 600 65 50 25 800/1200 J, T 100/200
800 800 65 50 25 1200/1600 L 100/200
1000 1000 65 50 25 1600 L 200
MB H E FD A 3 0030 A S U
Type
MB = Maintenance
Bypass
Orientation
H = Horizontal
Logic
E = Electromechanical
Switch
A = Fix mounted, molded
case switch (MCS) both
Number of Poles
2 = Two-pole
3 = Three-pole
4 = Four-pole
Enclosure
K = Open
S = NEMA 1
J = NEMA 12
R = NEMA 3R
L = NEMA 4
D = NEMA 4X
Certification
U = UL listed
Amperes
0100 = 100A
0150 = 150A
0225 = 225A
0300 = 300A
0400 = 400A
0600 = 600A
0800 = 800A
1000 = 1000A
Frame Size (Amperes)
Molded case
FD = HFD (100A, 150A)
KD = HKD (150A, 225A, 300A)
LD = HLD (400A)
NB = NB (600A, 1000A)
Voltage
A = 120V, 60 Hz
B = 208V, 60 Hz
W = 240V, 60 Hz
X = 480V, 60 Hz
Bypass Power Connections
Nor mal Power Connections
Tr a n s f er Mechanism
Solid Neutral Bar
Load Power Connections
Logic Disconnect Plugs
Maintenance Bypass Switch Control Panel
UPS Lockout Circuit Connection