Data Bulletin0613DB0301

R11/11, 12/2011

Replaces 0613DB0301, 09/2003

How to Determine Circuit Breaker Ampere RatingCircuit Breakers Equipped with Micrologic™ Trip SystemClass 0600

© 2003–2011 Schneider Electric All Rights Reserved ™

Micrologic™ Trip Units Types 3.2 (S), 3.3(S), 5.2, 5.3, 6.2, and 6.3—Used With PowerPact™ H-, J- and L-Frame Circuit Breakers

Ampere rating (Ir) is set by the Ir dial (Figure1, A) on the face of the trip unit. The maximum Ir setting corresponds to the sensor rating In (B).

Ampere rating Ir can be adjusted in 1 ampere increments on 5.2, 5.3, 6.2 and 6.3 trip units using the keypad (C).

Per the National Electrical Code 240.6(C) a circuit breaker that has restricted access to the adjusting means shall be permitted to have an ampere rating that is equal to the adjusted long-time pickup setting. Restricted access is defined as: (1) removable and sealable covers over the adjustment means, (2) bolted equipment enclosure doors, (3) locked doors accessible only to qualified personnel. Sealable covers are provided using an optional wire seal (catalog no. MICROTUSEAL).

Ground-Fault Setting The Micrologic 6 trip unit incorporates ground-fault protection; both pickup and time delay can be adjusted.

Set the ground-fault protection pickup Ig using the keypad. Set Ig to the exact value required (in steps of 0.05 In from 0.2 x In to 1.0 x In for 100–600 A and 0.3 x In to 1.0 x In for 60 A).

Set the time delay tg using the keypad. Use the same setting for selecting option I2t ON. Set tg to the desired value (0.0 s, 0.1 s, 0.2 s, 0.3 s, or 0.4 s - with or without I2t ON).

In Rating

Trip Unit

Figure 1: Micrologic 3.2(S), 3.3(S), 5.2, 5.3, 6.2 and 6.3 Trip Units

0611

3984

AB

454030 35

2520

15 6050

1084 6

3

1.5 1512

Ii (x In)

2

In=60A

Ii

tr

Ir

3.2

In=60A

Ir (A) tr @ 6 Ir Ii (x In)15 60

5045

4035302520

.5 16

16

168421

1.5 151210

86432

15A

ABMicrologic 5 Electronic Trip Unit

Micrologic 3 Electronic Trip Unit

A. Ampere rating Ir dial

B. Sensor rating In

Wire seal

How to Determine Circuit Breaker Ampere Rating 0613DB0301R11/11, 12/2011

© 2003–2011 Schneider Electric All Rights Reserved2

Micrologic™ Trip Units Types 3.0, 3.0A, 5.0, 5.0A, 5.0P, 5.0H, 6.0A, 6.0P, 6.0H—Used With Masterpact™ NT and NW and PowerPact™ M-, P-, and R-Frame Circuit Breakers

Adjustable Rating Plug Typically the A rating plug is supplied as standard equipment with factory-installed trip units. See Table 1 for other available rating plugs and settings.

To determine ampere rating (Ir), multiply sensor rating (In) by the long-time pickup setting. For example:

• In = 2000A

• Long-time pickup setting = 0.70

• Therefore Ir = 2000A x 0.70 = 1400A

Per the National Electrical Code 240.6(C) a circuit breaker that has restricted access to the adjusting means shall be permitted to have an ampere rating that is equal to the adjusted long-time pickup setting. Restricted access is defined as: (1) removable and sealable covers over the adjustment means, (2) bolted equipment enclosure doors, (3) locked doors accessible only to qualified personnel. A flip down cover is provided to protect the rating plug and long-time pickup setting adjustment. To seal the trip unit, a wire seal is required.

Ground-Fault Setting To determine ground-fault setting, multiply sensor plug rating (In) by the ground-fault pickup setting. For example:

• In = 2000A

• Ground-fault pickup setting = 0.30

• Therefore ground-fault setting = 2000A x 0.30 = 600A

NOTE: Changing the rating plug or long-time setting will not affect ground-fault pickup level.

For trip units equipped with ground-fault protection for equipment, the test push button used for electronic testing of ground-fault protection is located above the test connector. For other ground-fault current test procedures, consult the trip unit instruction bulletin.

0613

3208

In Rating

Wire seal

Table 1: Adjustable Rating Plug Selection

Rating Plug

Long-time Pickup Settings

A 1.0 0.90 0.80 0.70 0.63 0.60 0.50 0.45 0.40

B 1.0 0.95 0.88 0.75 0.63 0.56 0.50 0.44 0.40

C 1.0 0.95 0.83 0.75 0.69 0.58 0.53 0.50 0.42

D 1.0 0.95 0.93 0.90 0.80 0.70 0.64 0.48 0.40

E 1.0 0.95 0.93 0.90 0.85 0.80 0.75 0.70 0.60

F 1.0 0.98 0.96 0.94 0.92 0.90 0.88 0.86 0.84

G 0.82 0.80 0.78 0.76 0.74 0.72 0.70 0.68 0.66

H 0.64 0.62 0.60 0.58 0.56 0.54 0.52 0.50 0.48

0613DB0301 How to Determine Circuit Breaker Ampere RatingR11/11, 12/2011

© 2003–2011 Schneider Electric All Rights Reserved 3

Series B Micrologic Trip Units—Used with LX, LXI, and LE Circuit Breakers

NOTE: Frame size is not sensor size. For example, an LEL circuit breaker can have a sensor rating of 250, 400, 0 or 600 amperes.

Determine sensor rating from label on circuit breaker face.

Ampere rating = sensor size x rating plug multiplier x long-time pickup setting

Per the National Electrical Code 240.6(C) a circuit breaker that has restricted access to the adjusting means shall be permitted to have an ampere rating that is equal to the adjusted long-time pickup setting. Restricted access is defined as: (1) removable and sealable covers over the adjustment means, (2) bolted equipment enclosure doors, (3) locked doors accessible only to qualified personnel. Sealable covers are provided using an optional wire seal (catalog no. MICROTUSEAL). Two seals are required per circuit breaker, one for the rating plug and one on the clear trip adjustments cover.

Ground-Fault Setting To determine ground-fault setting multiply sensor size (In) by the ground-fault pickup setting.

NOTE: Ground-fault pickup level is not a function of rating plug or long-time setting, only sensor rating.

An optional ground-fault test panel is available. For other ground-fault system field testing, consult the circuit breaker instruction bulletin.

0602

3008

Rating Plug

Table 2: Interchangeable Rating Plug Kits

Catalog No. Rating Plug Multiplier Value

ARP040 0.400

ARP050 0.500

ARP056 0.563

ARP058 0.583

ARP060 0.600

ARP063 0.625

ARP067 0.667

ARP070 0.700

ARP075 0.750

ARP080 0.800

ARP083 0.833

ARP088 0.875

ARP090 0.900

ARP100 1.000

- - - - -

AMMETER / TRIP INDICATOR

PHASE

0 20 40 60 80 100% of Rating

INDICATORRESET

PHASESELECT

Press and Holdfor Ammeter Reset

FULL-FUNCTIONSERIES B

810

12

14

3

4.56

2

LONG TIME

DELAYSEC. AT

6 x PFLASH=90%

ON = OVERLOAD

.8.9

.95

1.0

.6

.7.75

.5

.5.32

.2

.1

.2

.32.5

.1

SHORT TIME

5

6

7

8

2.5

34

2

INSTANT.

67

8

OFF

3

45

2.5

.5.32

.2

.1

.2

.32.5

.1

GROUND FAULT

PICKUP

.45.55

.65

.75

.25

.3.35

.2

DELAY DELAY

PICKUPx P

PICKUPx P

PICKUPx P

22I t OUT I t IN 22I t OUT I t IN

SEC. AT12 x P

SEC. AT1 x S

RATING PLUG

Max. Ampere Rating (P) = Sensor (S) x 100%

CAT NO. : ARP100

micrologic

Wire Seal

How to Determine Circuit Breaker Ampere Rating 0613DB0301Data Bulletin R11/11, 12/2011

Electrical equipment should be installed, operated, serviced, and maintained only by qualified personnel. No responsibility is assumed by Schneider Electric for any consequences arising out of the use of this material.

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© 2003–2011 Schneider Electric All Rights Reserved4