Vanguard MCCB-250 User Manual download pdf (Page 13)

REV 2 MCCB-250 USER’S MANUAL

3.0 OPERATING PROCEDURES

3.1 Testing the Time Delay of a Protection Relay

Figure 3 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 protection relay. One of the relay dry contacts is used to stop the MCCB-250

timer.

Figure 3. Typical MCCB-250 Application

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Vanguard MCCB-250 User Manual Page 13