Product Overview - ABB OTM_C_21D Installation And Operating Instructions Manual

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A U T O M AT I C T R A N S F E R S W I T C H , O T M _ C _ 2 1 D
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Product overview

Product overview
The OTM_C_21D automatic transfer switch can be
used as a source transfer switch in a threephase or
single-phase networks. Monitored conditions are,
no-voltage, phase-loss, overvoltage and under-
voltage detection, transfer delays, generator start
and stop, and remote test function.
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1. Handle for manual operation
2. Place for auxiliary contact blocks
3. Push button
4. Mimic panel
5. Voltage sensing connections
6. Locking clip for padlock
The standard package includes:
1. automatic transfer switch, 2. handle, 3. handle storage clip and 4. terminal plug.
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Figure 1. OTM_C_21D automatic transfer switch
Source transfer can be performed using a manu-
ally operated handle, locally using push buttons or
fully automatically. The automatic mode includes
several operating methods: Line 1 priority, no line
priority and manual back switching mode.
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8 1 3
7. Locking latch for releasing the handle and
locking electrical control
8. Locking clip for locking manual operation
9. Dip switches
10. Rotary switches
11. Connecting terminal
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