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MCCB-250

MOLDED-CASE CIRCUIT BREAKER TESTER

USER’S MANUAL

Vanguard Instruments Company, Inc.

1520 S. Hellman Ave.
Ontario, California 91761, USA

TEL: (909) 923-9390
FAX: (909) 923-9391

January 2015

Revision 2.1

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Summary of Contents for MCCB-250

Page 1: ...MCCB 250 MOLDED CASE CIRCUIT BREAKER TESTER USER S MANUAL Vanguard Instruments Company Inc 1520 S Hellman Ave Ontario California 91761 USA TEL 909 923 9390 FAX 909 923 9391 January 2015 Revision 2 1...

Page 2: ...onnel or by an authorized repair service provider Unauthorized modifications can cause safety hazards and will void the manufacturer s warranty EQUIPMENT RATINGS IP Rating The enclosure for the MCCB 2...

Page 3: ...rent Input 9 2 6 LCD Contrast Control 9 3 0 OPERATING PROCEDURES 11 3 1 Testing the Time Delay of a Protection Relay 11 3 2 Measuring Current Transformer Primary and Secondary Currents 13 LIST OF TABL...

Page 4: ...ey switch input or knob on the MCCB 250 is indicated as KEY SWITCH INPUT KNOB Menu options are referenced as MENU OPTION MCCB 250 LCD screen output is shown as Warning messages are indicated as WARNIN...

Page 5: ...he MCCB 250 has 4 current source outputs 5 A 120 Vac 25 A 24 Vac 120 A 6 Vac 250 A 3 Vac that conduct the test current through the high impedance load circuits Each current source can tolerate short d...

Page 6: ...ms 2 hours Accuracy 0 1 of reading 1ms TIMER STOP INPUTS Voltage input 24V 300V DC or peak AC dry contact input or removal of primary current DISPLAY Back lit LCD Screen 20 characters by 4 lines viewa...

Page 7: ...l description in Table 2 The table describes the function of each item on the control panel The purpose of the controls and indicators may seem obvious but users should become familiar with them befor...

Page 8: ...d Connect ground stud to substation ground using provided cable 10 CURRENT CONTROL Current control knob 11 HIGH CURRENT PRESENT High current presence indicator LED 12 None Back lit LCD screen 20 chara...

Page 9: ...knob This test current is measured and displayed on the LCD screen The MCCB 250 s output current ratings are shown in Table 3 and Table 4 below Table 3 MCCB 250 Current Output CURRENT OUTPUT 120 Vac...

Page 10: ...t source press and hold the key The LED indicator next to the MOMT label will turn on indicating that the MCCB 250 current source is on The output current will also be displayed on the LCD screen The...

Page 11: ...contact state will stop the timer and turn off the current source In WET CONTACT mode the MCCB 250 will sense an AC or DC voltage applied to the TIMER STOP terminals The OFF state is a voltage from 0...

Page 12: ...this feature is to measure a current transformer CT current ratio The MCCB 250 can be used to output a current to the CT primary input The CT secondary output is then connected to the MCCB 250 s EXT...

Page 13: ...ill be displayed on the LCD screen during the start up sequence To toggle the cycle time setting first make sure the unit is turned OFF then hold down the key to the left of the LCD screen and then tu...

Page 14: ...illustrates a typical connection of the MCCB 250 to a protection relay to test its Open Time Delay The MCCB 250 injects a test current through a bus The test current is sensed by the CT of the protec...

Page 15: ...NT PRESENT LED will be illuminated i Turn the CURRENT CONTROL knob to set the desired current j Release the key k Press the key to select the ON TIMER mode and start the test The MCCB 250 will inject...

Page 16: ...Figure 4 shows a typical connection of the MCCB 250 to a current transformer In this configuration the MCCB 250 injects a test current through the CT primary The CT secondary current is sensed by the...

Page 17: ...y to momentarily turn on the current source g Turn the CURRENT CONTROL knob to set the desired current h Release the key i Press the key to select the ON TIMER mode and to start the test j Observe and...

Page 18: ...S Hellman Ave Ontario CA 91761 USA Phone 909 923 9390 Fax 909 923 9391 www vanguard instruments com Copyright 2009 by Vanguard Instruments Company Inc MCCB 250 User s Manual Revision 2 1 January 7 201...

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