Micrologic™ 2.0A, 3.0A, 5.0A, and 6.0A Electronic Trip Units

48049-136-05

Section 1—General Information

Rev. 01, 07/2012

 

 

Trip Unit Switches

ENGLISH

Long-Time Protection

Long-time protection protects equipment against overloads.

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

Long-time protection is standard on all trip

units.

The long-time pickup (Ir) (A) sets 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 long-time pickup (Ir) is

adjustable from 0.4–1.0 times the sensor

plug rating (In).

The long-time delay (tr) (B) sets the length of

the time that the circuit breaker will carry an

overcurrent (below the short-time or

instantaneous pickup current level) before

Micrologic 2.0A Trip Unit

A B C

06134243

.6

 

 

.95

2

 

16

 

 

 

 

 

 

 

 

 

time

 

 

 

 

 

 

 

 

 

Ir

.8

 

tr

4 8

 

alarm

 

 

.7

.9

(s)

12

 

 

 

 

 

 

.5

 

 

.98

1

 

20

 

 

 

 

 

 

 

.4 x In 1

 

.5 @ 6 Ir24

 

 

 

 

 

 

 

instantaneous

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Isd

4

 

 

 

 

 

 

 

 

 

 

3

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.5

 

 

6

 

 

 

 

 

 

 

 

 

2

 

 

8

 

 

 

 

 

 

 

 

 

1.5 x Ir 10

 

 

 

 

 

 

 

 

 

 

setting

 

 

 

 

 

 

 

 

Micrologic 3.0A Trip Unit

A B C

06133203

.6

 

 

.95

2

 

16

 

 

 

 

 

 

 

 

 

time

 

 

 

 

 

 

 

 

 

Ir

.8 .9

tr

4 8

 

alarm

 

 

.7

(s)

12

 

 

 

 

 

 

.5

 

 

.98

1

 

20

 

 

 

 

 

 

 

.4 x In 1

 

.5 @ 6 Ir24

 

 

 

 

 

 

 

instantaneous

 

 

 

 

 

 

 

 

 

Ii

5

 

 

 

 

 

 

 

 

 

 

4

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

8

 

 

 

 

 

 

 

 

 

2

 

 

10

 

 

 

 

 

 

 

 

 

1.5

 

12

 

 

 

 

 

 

 

 

 

 

 

x In

 

 

 

 

 

 

 

 

setting

tripping. See Table 1 for delay settings.

Both long-time pickup and long-time delay

are on the field-replaceable adjustable rating

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 —Adjustable

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

 

 

 

time

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ir

.8 .9

 

 

tr

 

 

8

 

 

 

alarm

 

 

 

.7

 

 

(s)

4

12

 

 

 

 

 

 

 

 

.6

 

 

.95

2

 

 

 

16

 

 

 

 

 

 

 

 

.5

 

 

.98

1

 

 

 

20

 

 

 

 

 

 

 

 

.4 x In 1

 

 

.5 @ 6 Ir24

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

short time

 

 

 

 

 

 

 

 

instantaneous

 

Isd

4

 

 

 

tsd

 

.4

.3

 

I i

8

 

 

 

 

3

5

 

 

(s)

.4

 

6

 

10

 

 

 

 

.3

 

 

.2

 

 

 

 

 

2.5

 

 

6

 

 

 

 

4

 

 

12

 

2

 

 

8

 

.2

 

 

.1

 

3

 

 

15

 

1.5

 

10

 

 

 

.1

2

0

 

2

 

 

off

 

 

 

x Ir

 

on

I t

off

 

 

 

x In

 

 

 

 

setting

 

 

 

delay

 

 

 

 

 

 

 

Micrologic 6.0A Trip Unit

06133351

A

 

 

 

 

B

 

 

 

 

 

 

C

 

 

long time

 

 

 

 

 

 

 

 

 

 

 

 

 

Ir

.8

 

 

 

tr

 

8

 

 

 

alarm

 

.7

.9

 

 

(s) 4

12

 

 

 

 

 

 

 

.6

 

 

.95

 

2

 

 

16

 

 

 

 

 

 

 

.5

 

 

.98

 

1

 

 

20

 

 

 

 

 

 

 

 

.4 x In 1

.5 @ 6 Ir24

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

short time

 

 

 

 

 

 

instantaneous

 

Isd

4

 

 

 

tsd

.4

.4 .3

 

I i

 

 

 

 

 

 

 

 

8 10

 

 

3

5

 

 

(s)

 

5

 

 

 

 

 

.3

 

 

.2

 

 

2.5

 

 

6

 

 

 

 

 

4

12

 

2

 

 

8

 

 

.2

 

 

.1

 

3

15

 

 

1.5 x Ir

10

 

 

.1

I2t

0

 

 

2 x Inoff

 

 

 

 

on

off

 

 

 

 

 

setting

 

delay

 

 

 

 

test

 

Ig

E

 

 

 

tg

.4

.4 .3

 

 

 

 

 

 

 

 

D

F

 

(s)

 

 

 

 

 

 

 

C

 

G

.3

 

 

.2

 

 

 

 

 

 

 

B

 

H

.2

 

 

.1

 

 

 

 

 

 

 

 

A

 

J

.1

I2t

0

 

 

 

 

 

 

 

 

 

on

off

 

 

 

 

 

 

 

 

ground fault

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

the Ir long-time pickup threshold has been

exceeded.

Long-time protection uses true RMS

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 long-time circuit was cleared every time the load dropped below the pickup setting or after every tripping event.

Table 1:

Micrologic Trip Unit Long-Time Delay Values

 

 

Setting1

Long-Time Delay in Seconds2

 

 

 

 

 

tr at 1.5 x Ir

12.5

25

50

100

 

200

300

400

500

600

 

 

 

 

 

 

 

 

 

 

 

tr at 6 x Ir

0.5

1

2

4

 

8

12

16

20

24

 

 

 

 

 

 

 

 

 

 

 

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 long-time pickup. In = sensor rating. Trip threshold between 1.05 and 1.20 Ir.

2Time-delay accuracy +0/-20%

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 full-function test kit to defeat the thermal imaging.

10-EN

© 1999–2012 Schneider Electric All Rights Reserved

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Schneider Electric 3.0A, 2.0A, 5.0A Trip Unit Switches, Long-Time Protection, Micrologic Trip Unit Long-Time Delay Values