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MK201A DT Earth Fault Relay User's
Guide
A BRIEF OVERVIEW
h
g
f
a - Auxiliary power supply indicator
b - High-set start/trip status indicator
c - Low-set start/trip status indicator
d - Earth-fault high-set adjustment
e - Trip reset button
f - Test button
g - Earth-fault low-set adjustment
h - Delay time adjustment
a
b
c
d
e
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Table of Contents
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Summary of Contents for Mikro MK201A
- Page 1 MK201A DT Earth Fault Relay User's Guide A BRIEF OVERVIEW a - Auxiliary power supply indicator b - High-set start/trip status indicator c - Low-set start/trip status indicator d - Earth-fault high-set adjustment e - Trip reset button f - Test button...
- Page 2 TECHNICAL DATA 1. Current and Time Adjustments Earth-fault Low-set Current (l>) Adjustment • This adjustment is for setting the minimum earth-fault current for tripping. If the measured current exceeds this threshold value, tripping starts. After a prefixed delay time determined by the DELAY adjustment, the trip contacts will be activated. •...
- Page 3 • This contact (R1) is activated during an earth-fault trip. the contacts remain activated regardless of the removal of fault current. This relay can only be reset by pressing the “RESET” button. 5. Electrical Specification Auxiliary Supply MK201A-240A......198~265 VAC MK201A-110A......94~127 VAC Supply frequency......50Hz VA rating........3 VA typical Trip Contact Rated Voltage......250 VAC...
- Page 4 7. Connection Diagram a) Earth fault relay MK 201A a) Combined overcurrent and earth fault relays MK 201A MK204A 8. Case Dimensions 90mm 90mm 70mm 9 6 mm Fr o n t...
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