Which code corresponds to the switch indicating relay (polarized DC)?

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Multiple Choice

Which code corresponds to the switch indicating relay (polarized DC)?

Explanation:
Polarized DC switch-indicating relays respond to the direction of current: the coil’s polarity determines which way the relay armature moves, producing a clear indication of the switch (turnout) position. In signaling practice, the code for this specific device is Kr, so it uniquely matches the description of a switch indicating relay that uses polarized DC. The other codes refer to different relay or circuit types and do not describe this polarized DC switch-indicator function, so they aren’t correct in this context.

Polarized DC switch-indicating relays respond to the direction of current: the coil’s polarity determines which way the relay armature moves, producing a clear indication of the switch (turnout) position. In signaling practice, the code for this specific device is Kr, so it uniquely matches the description of a switch indicating relay that uses polarized DC. The other codes refer to different relay or circuit types and do not describe this polarized DC switch-indicator function, so they aren’t correct in this context.

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