Product Overview; Product Overview And Packing - ABB OTM C 21D Installation And Operating Instructions Manual

2. Product overview

2. Product overview

2.1 Product overview and packing

The OTM_C_21D automatic transfer switch can be used as a source transfer switch in a three-
phase or single-phase networks. Monitored conditions are, no-voltage, phase-loss,
overvoltage and undervoltage detection, transfer delays, generator start and stop, and remote
test function. Source transfer can be performed using a manually 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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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
1SCC303015M0201 l ABB Installation and operating instructions, 34OTM_C_21D rev. B
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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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