REV 2 MCCB-250 USER’S MANUAL
ii
TABLE OF CONTENTS
CONVENTIONS USED IN THIS DOCUMENT ....................................................................... 1
1.0 INTRODUCTION .................................................................................................................. .. 2
1.1 General Description and Features ................................................................................... 2
1.2 Furnished Accessories ...................................................................................................... 2
1.3 MCCB-250 Technical Specifications ................................................................................. 3
1.4 Controls and Indicators .................................................................................................... 4
2.0 FUNCTIONAL DESCRIPTION ................................................................................................. 6
2.1 MCCB-250 AC Current Source .......................................................................................... 6
2.2 MCCB-250 Current Output Control ................................................................................. 7
2.3 Timer Stop Input and Control .......................................................................................... 8
2.4 MCCB-250 Timer .............................................................................................................. 9
2.5 External Current Input ..................................................................................................... 9
2.6 LCD Contrast Control ....................................................................................................... 9
3.0 OPERATING PROCEDURES ................................................................................................. 10
3.1 Testing the Time Delay of a Protection Relay ................................................................ 10
3.2 Measuring Current Transformer Primary and Secondary Currents .............................. 12
LIST OF TABLES
Table 1. MCCB-250 Technical Specifications .................................................................................. 3
Table 2. Functional Descriptions of MCCB-250 Controls and Indicators ........................................ 5
Table 3. MCCB-250 Current Output .............................................................................................. .. 6
Table 4. MCCB-250 Overload Current Output ................................................................................ 6
LIST OF FIGURES
Figure 1. MCCB-250 Controls and Indicators .................................................................................. 4
Figure 2. Typical MCCB-250 Test Results Screen ............................................................................ 9
Figure 3. Typical MCCB-250 Application ....................................................................................... 10
Figure 4. Typical Current Transformer Current Ratio Test Connections ...................................... 12
(68 pages)
(57 pages)
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