Mikro MK204A, MK203A User Manual

MK204A IDT Overcurrent Relay User's
Guide

A BRIEF OVERVIEW

a

b
c

d

h

g

f

e

a - Auxiliary power supply indicator

b - High-set start/trip status indicator

c - Low-set start/trip status indicator

d - Overcurrent high-set adjustment

e - Trip reset button

f - Test button

g - Overcurrent low-set adjustment

h - Time multiplier adjustment

TECHNICAL DATA

1. Current and Time Adjustments

Overcurrent Low-set Current (l>) Adjustment

• This adjustment is for setting the minimum overcurrent
for tripping with time delay.

• The setting range is from 2A to 6A.

Overcurrent High-set Current (l>>) Adjustment

• This adjustment is for setting the instantaneous tripping
current due to an overcurrent.

• The setting range is from 1x to 10x of the overcurrent
low-set setting value.

l>> = a x l>, a = 1 to 10

• This high-set feature can be disabled by setting the

tripping current to infinity ( ' )

Time Multiplier (IDT) Adjustment

• The delay timing adjustment is for selecting different
delay curve as shown in figure 1.

2. Light Indicators

The light indicators display the status of the system.

• The setting range is from 0.05 to 1.0.

Figure 1: IDT Inverse

Indicator
AUX l> l>> Status
Off Off Off No auxiliary power supply.
On Off Off System normal mode. No tripping.

On On Off

On

On Off On

On Off Blink Overcurrent high-set tripped.

Blink Off Overcurrent low-set tripped.

Overcurrent low-set start.

Overcurrent high-set start.