Brochure

© 1998 Square D All Rights Reserved
48
5/98
MECHANICAL INTERLOCK
General
Type S contactors or starters can be mechanically
interlocked so that only one device will be
energized at a time. The mechanical interlock is
an interference (non-jamming) type, locking at the
beginning of the stroke of any starter or contactor.
Overload Relay Mounting Bracket
Mechanical interlock Types SM-1 through SM-10
for Sizes 00-2 devices use overload relay
mounting brackets to support the overload relay
portion of the starter.
Type S Sizes 00, 0, 1 and 2
The mechanical interlock is mounted on the
underside of the reversing baseplate. Two pins
extend from the mechanical interlock through
openings in the baseplate and engage the contact
carrier of each contactor. Two styles of
mechanical interlocks are used: one version for
three pole contactors, a different version for four
or five pole contactors. When adding a power
pole to an existing three pole reversing
contactor, a new mechanical interlock must
also be installed.
Three unit mechanically interlocked contactors
and/or starters are also available for various
combinations of Sizes 0, 1 and 2.
Type S Sizes 3, 4, 5 and 6
The mechanical interlock is separate from the
mounting pan on Sizes 3-6. Cams on the
mechanical interlocks are operated by the contact
carrier of each contactor. The mechanical
interlock is attached to the underside of the two
contactors on Sizes 3 and 4; directly to the
mounting pan on sizes 5 and 6. Size 5 and 6
mechanical interlocks are sold only as a factory
assembly with the 8810 starter.
The mechanical interlock utilizes a special
baseplate and bracket that connects between the
armatures. This is sold only as a factory assembly
with the 8810 starter.
Mechanical Interlock for Two Contactors
Kit Description – The following kits consist of the mechanical interlock and base assembly for
interlocking 2-5 pole contactors. Mechanical interlocks for horizontal and vertical mounting are
listed for various pole arrangements.
Contactor
NEMA
Size
Class
9999
Type
Horizontal
Type SM-1 for Size 00j, 0, or 1
Type SM-6 for Size 2
Type SM-12 for Sizes 3 & 4
Horizontalt
Type SM-2 for Size 0 or 1
Type SM-7 for Size 2
Type SM-12 for Sizes 3 & 4
Verticalt
Type SM-2 for Size 0 or 1
Type SM-10 for Size 2
Type SM-11 for Size 3
Type SM-13 for Size 4
00j, 0, 1 SM-1
0, 1 SM-2t
0, 1 SM-3
0, 1 SM-4
0, 1 SM-5
Horizontal
Type SM-3 for Size 0 or 1
Type SM-8 for Size 2
Type SM-12 for Sizes 3 & 4
Vertical
Type SM-4 for Size 0 or 1
Type SM-9 for Size 2
Type SM-11 for Size 3
Type SM-13 for Size 4
Horizontal
Type SM-5 for Size 0 or 1
Type SM-11 for Size 3
Type SM-13 for Size 4
2 SM-6
2 SM-7
2 SM-8
2 SM-9
2 SM-10
3 SM-11q
3, 4 SM-12q
4 SM-13q
t The type SM-2 interlock is factory assembled for horizontal mounting but can easily be converted to vertical mounting. Conversion instructions are
included.
j For replacement only on the NEMA Size 00, reversing starters and contactors.
q Interlocks do not include mounting pan.
Overload Relay Mounting Bracket
Kit Description Class 9999 Type
Bracket for one overload relay used with horizontal mechanical interlocks, Types SM-1, SM-2, SM-3, SM-6, SM-7 and SM-8 SO-11
Bracket for two overload relays used with vertical mechanical interlocks, Types SM-2, SM-4, SM-5, SM-9 and SM-10 SO-12
2 Pole
or
3 Pole
2 Pole
or
3 Pole
4 Pole
or
5 Pole
2 Pole
or
3 Pole
4 Pole
or
5 Pole
2 Pole
or
3 Pole
4 Pole
or
5 Pole
4 Pole
or
5 Pole
2 Pole
or
3 Pole
2 Pole
or
3 Pole
4 Pole
or
5 Pole
4 Pole
or
5 Pole
AC Multispeed Magnetic Starters
Application Data for Types SB-SJ – Class 8810, 8811, 8812
Class 9999 Type SM-1
Mechanical Interlock For
Two Contactors
Horizontally Mounted
Class 9999 Type SM-12
For Sizes 3 and 4
Horizontally Mounted
Type SO-11 Overload Relay
Mounting Bracket