Rockwell Automation 140U N-Frame Circuti Breakers Instruction Leaflet for N-Frame Circuit Breakers - Manual (Page 3)

Page 3
➀ Not UL listed
➁ Occurs with short delay time adjustment set at I.
➂ The Molded Case Switch has a fixed non-interchangeable rating plug
Ground Fault Protection: When selected, ground fault
pick-up and time delay settings shown in Table 1-2 allow
selective ground fault coordination with other circuit pro-
tection devices.
Ground Fault Alarm Unit: A ground fault alarm unit may
be used with the trip unit to provide visual indication and
a contact closure when a ground fault trip occurs. The
ground fault trip alarm unit is ordered and shipped sepa-
rately if required.
DC Application: N-Frame trip units are suitable for AC
application only.
Field Testing: Test points are available for functional field
testing of the trip unit when connected to test kit.
Internal Accessories: Internal accessories mount on
the Digitrip trip unit. A list of internal accessories and
their instruction leaflets is provided below:
• Alarm (Signal)/Lockout (ASL) Switch 40752-094
• Auxiliary Switch 40752-097
• Shunt Trip 40752-095
Note: Shunt trip and undervoltage accessories, if
required, must be mounted in the left pole.
Note: N-Frame trip unit versions with ground fault
protection are supplied with an auxiliary switch,
mounted in the right pole of the trip unit.
TABLE 1-2: ELECTRONIC TRIP UNIT FUNCTION AND RATING SENSING
Trip Function Rating/Setting Description ➂
Ampere Rating
Fixed at 100% Fixed rating plugs available
Trip Unit Ampere Rating Fixed Rating Plugs
1200 Amp
800 Amp 600, 630 ➀ , 700, 800, 1000, 1200, 1250 ➀ A (I
n
)
400, 450, 500, 550, 600, 630 ➀ , 700, 800A (I
n
)
Adjustable Long
Time Pick-up Adjustable rating plugs
available
Trip Unit Ampere Rating Adjustable Rating Plugs
1200 Amp
800 Amp 600,800,1000,1200A (I
n
)
400,500,600,800A (I
n
)
Short Delay Pick-up (Adjustable) In multiples of installed rating plug amperes (I
n
) with marks at 2-3-4-5-6-7-8x
Short Delay Time (Fixed)
I
2
t ramp configuration
Short Delay Time (Adjustable) Flat response with time delay settings at 100 ms, 200 ms, and 300 ms
Instantaneous Pick-up ➁ In multiples of installed rating plug amperes (I
n
) with marks at 2-3-4-5-6-7-8x
Ground Fault
Pick-up
(adjustable) Trip Unit Ampere Rating Trip Unit Setting
1200 Amp
800 Amp 200, 400, 600, 800, 1000 and 1200 Amp
200, 400, 600, 800, 1000 and 1200 Amp
Ground Fault Time Delay Settings at instantaneous (I) 150 ms, 300 ms, and 500 ms
40752-093(1) Effective 5/02
• Undervoltage Release Mechanism
(Handle Reset) 40752-096