General: Type S contactors or starters can be mechanically interlocked so that only one device is 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.
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 the left-hand side of an existing Size 0, 1, or 2 three-pole reversing contactor, a new mechanical interlock must also be installed. When added to the right-hand side only, the power pole will not be mechanically interlocked with the left-hand contactor.
Type S Sizes 3 and 4—The mechanical interlock is separate from the mounting pan on Sizes 3 and 4. 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 contactor baseplates on Sizes 3 and 4.
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Table 16.374:
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Mechanical Interlock for Two Contactors The following mechanical interlock kits can be used to interlock 2–5 pole contactors. Mechanical interlocks for horizontal and vertical arrangement are listed in Various pole arrangements.
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HorizontalType SM1 for Size 00–1 Type SM6 for Size 2 Type SM12 for Sizes 3 & 4
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HorizontalType SM2 for Size 0 or 1 aType SM7 for Size 2 Type SM12 for Sizes 3 & 4
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VerticalType SM2 for Size 0 or 1 aType SM10 for Size 2 Type SM11 for Size 3 Type SM13 for Size 4
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HorizontalType SM3 for Size 0 or 1 Type SM8 for Size 2 Type SM12 for Sizes 3 & 4
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VerticalType SM4 for Size 0 or 1 Type SM9 for Size 2 Type SM11 for Size 3 Type SM13 for Size 4
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VerticalType SM5 for Size 0 or 1 Type SM11 for Size 3 Type SM13 for Size 4
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