23
An ammeter should be connected in the positive supply line to measure these
burdens. Typical values for the dc burdens are shown in the following tables for the
MVTU 11, 12, 13 and 18.
Burdens for MVTU 11 definite time delayed undervoltage relay
Nominal voltage range (V) 30/34 48/54 110/125 220/250
Series dropper resistor None 220 1k 2 x 4k7
Rext 1 (ohm) in parallel
DC voltage supplied for test (V) 30 48 110 220
Relay on
standby 31 41 71 76
Vin > V setting
Relay output
energised 69 70 72 76
Vin < V setting
Relay on
standby 31 41 71 76
Vin > V setting
Relay output
and LED 82 83 85 89
trip indicator
operated
LED trip
indicator 75 76 78 82
operated
only
Current drain
for relays
fitted with
mechanical
flag (mA)
Current drain
for relays
fitted with
LED trip
indicator
(mA)
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