Micrologic™ 2.0A, 3.0A, 5.0A, and 6.0A Electronic Trip Units | |
Section | Rev. 01, 07/2012 |
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Trip Unit Switches
ENGLISH
Long-Time Protection
NOTE: Micrologic trip units are powered from the circuit to always provide fault protection. All other functions (display, metering, communications, etc.) require external power. See 15 for more information.
Figure 7: Long-Time Protection Switches
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units. |
• The |
maximum current level (based on sensor |
plug rating In) which the circuit breaker can |
continuously carry. If current exceeds this |
value, circuit breaker will trip after the preset |
time delay. The |
adjustable from |
plug rating (In). |
• The |
the time that the circuit breaker will carry an |
overcurrent (below the |
instantaneous pickup current level) before |
Micrologic 2.0A Trip Unit
A B C
06134243 | .6 |
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Micrologic 3.0A Trip Unit
A B C
06133203 | .6 |
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| Ir | .8 .9 | tr | 4 8 |
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| Ii | 5 |
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setting
tripping. See Table 1 for delay settings. |
• Both |
are on the |
plug. To change settings to more precisely |
match the application, various rating plugs |
are available. For instructions on replacing |
the rating plug, see Section 5 |
Rating Plug Replacement. |
• For Masterpact™ NT and NW circuit |
breakers, the In value can be changed by |
replacing the sensor plug below the trip unit. |
For further information, see the instructions |
packed with the sensor plug replacement kit. |
• The overload indicator light (C) indicates that |
Micrologic 5.0A Trip Unit
A B C
06133204 |
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| Isd | 4 |
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Micrologic 6.0A Trip Unit
06133351 | A |
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| Ir | .8 |
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| Isd | 4 |
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| 1.5 x Ir | 10 |
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| .1 | I2t | 0 |
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| setting |
| delay |
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| test | |||||||
| Ig | E |
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| tg | .4 | .4 .3 |
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| J | .1 | I2t | 0 |
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| on | off |
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the Ir |
exceeded. |
• |
measurement. |
Thermal imaging provides continuous temperature rise status of the wiring, both before and after the device trips. This allows the circuit breaker to respond to a series of overload conditions which could cause conductor overheating, but would go undetected if the
Table 1: | Micrologic Trip Unit |
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Setting1 |
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tr at 1.5 x Ir | 12.5 | 25 | 50 | 100 |
| 200 | 300 | 400 | 500 | 600 |
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tr at 6 x Ir | 0.5 | 1 | 2 | 4 |
| 8 | 12 | 16 | 20 | 24 |
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tr at 7.2 x Ir | 0.343 | 0.69 | 1.38 | 2.7 |
| 5.5 | 8.3 | 11 | 13.8 | 16.6 |
1Ir = In x
3For Micrologic 5.0A and 6.0A trip units, when tsd is set to 0.4 on or 4.0 off, then tr = 0.5 instead of 0.34.
NOTE: If checking trip times, wait a minimum of 15 minutes after circuit breaker trips before resetting to allow the thermal imaging to reset completely to zero or use a
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