Time Delay Unit for Undervoltage Release
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A time delay unit for the MN eliminates the risk of nuisance tripping due to a transient voltage dip lasting less than 200 ms for fixed delay units and up to 3 seconds for adjustable units. For shorter micro-outages, a system of capacitors provides temporary supply to the MN at V > 0.7 Vn to ensure not tripping.
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The correspondence between MN and time-delay units is shown below.
Time Delay Unit for Undervoltage Release (MN)
|
Time Delay Unit |
Composed of: |
Catalog Number |
|---|---|---|
|
MN 48 Vac 50/60 Hz with Fixed Time Delay |
MN 48 Vac |
|
|
Delay Unit 48 Vac 50/60 Hz |
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MN 220-240 Vac 50/60 Hz with Fixed Time Delay |
MN 250 Vac |
|
|
Delay Unit 220-240 Vac 50/60 Hz |
||
|
MN 48 Vac/Vdc 50/60 Hz with Adjustable Time Delay (≥ 200 ms) |
MN 48 Vdc |
|
|
Delay unit 48 Vac/Vdc 50/60 Hz |
||
|
MN 110-130 Vdc/Vac 50/60 Hz with Adjustable Time Delay (≥ 200 ms) |
MN 125 Vdc |
|
|
Delay unit 100-130 Vac/Vdc 50/60 Hz |
||
|
MN 220-250 Vac/Vdc 50/60 Hz with Adjustable Time Delay (≥ 200 ms) |
MN 250 Vdc |
|
|
Delay Unit 200-250 Vac/Vdc 50-60 Hz |