BE1-51/27C General Information
1-7
I
!
(50
X tap value or 500A, whichever is less)
T
Sensing Input Rating
The maximum 1 second current rating is 50X (times)
maximum tap current selected, or 500 A, whichever is less. Maximum
continuous current is 20 A. For ratings other than those specified by the
time curves, rating is a calculated as follows:
Where: I = Maximum Current, and T = Current Flow in Seconds
Time Overcurrent Pickup
Continuously adjustable over the current sensing input ranges specified
Selection Range
in the Style Chart (Figure 1-1).
Time Overcurrent Measuring
±2% of the pickup setting.
Accuracy
Time Overcurrent Dropout
Better than 95% of pickup level.
Ratio
Instantaneous Overcurrent
Continuously adjustable over the range of 1 to 40 times the time
Pickup Range
overcurrent pickup setting.
Instantaneous Overcurrent
±2% of pickup setting.
Measuring Accuracy
Instantaneous Overcurrent
Better than 98% of pickup level.
Dropout Ratio
Time Delay Accuracy
±5% of the characteristic curve (Figures 1-2 through 1-70) for any com-
bination of the front panel
TIME DIAL
setting and the front panel
TAP/TAP
CAL
overcurrent pickup setting.
Repeatability is within ±2% of setting at 25
"
C.
Output Circuits
Output contacts are rated as follows:
Resistive:
120/240 Vac
Make 30 A for 0.2 seconds, carry 7 A continuously, and break 7 A.
250 Vdc
Make and carry 30 A for 0.2 seconds, carry 7 A continuously, and break
0.3 A.
500 Vdc
Make and carry 15 A for 0.2 seconds, carry 7 A continuously, and break
0.1 A.
Inductive:
120/240 Vac,
Make and carry 30 A for 0.2 seconds, carry 7 A continuously, and break
125/250 Vdc
0.3 A. (L/R = 0.04).
Target Indicators
Function targets may be specified as either internally operated, or current
operated by a minimum of 0.2 A through the output trip circuit. When cur-
rent operated, the output circuit must be limited to 30 A for 0.2 seconds, 7
A for 2 minutes, and 3 A continuously.
Summary of Contents for BE-51/27C
Page 1: ...0 1 2 3 4 5 67869 ABC DEF G 6H II GGJ KL M DEF DEK...
Page 16: ...BE1 51 27C Controls and Indicators 2 2 Figure 2 1 Location of Controls and Indicators...
Page 20: ...BE1 51 27C Controls and Indicators 2 6...
Page 22: ...BE1 51 27C Functional Description 3 2 Figure 3 2 Functional Block Diagram...
Page 32: ...BE1 51 27C Installation 4 7 Figure 4 10 Typical Internal Diagram Sensing Input Type L...
