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AUTOMATIC TRANSFER SWITCH, OTM_C_21D

The OTM_C21D 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 un-

dervoltage detection, transfer delays, generator

start and stop, and remote test function. Source

transfer can be performed using a manually

The standard package includes:

1. automatic transfer switch, 2. handle, 3. handle storage clip 4. terminal plug, 5. mounting kit

Figure 1. OTM_C_21D automatic transfer switch

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

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

12. Modbus RTU access

10 4 5

8 1 3 6

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. OTM_

C21D can achieve communication function by

using the optional external Modbus RTU module.

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2. Product overview

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2.1 Product overview and packing

ABB OTM C 21D User Manual

Questions and Answers: