GEK-45404
5
broken delta voltage will therefore be three times the normal delta phase-to-phase voltage with no
fault.
RATINGS
The operating-circuit ratings available are shown in Table I. The operating coil will stand rated
voltage continuously on any tap.
RELAY VOLTAGE RATINGS
60HZ 50HZ
IAV51D 115 115
199 199
345 345
IAV51K 67 67
IAV52C 115 115
199 199
345 345
IAV52D 199
IAV52K 67 67
The current-closing rating of the contacts is 30 amperes for voltage not exceeding 250 volts. The
current-carrying ratings are affected by the selection of the tap on the seal-in coil, as indicated in
Table II. TABLE II
FUNCTION AMPERES
2-Amp Tap 0.2-Amp Tap
Tripping Duty Carry
Continuously 30
30
0.3
The 2-ampere tap has a DC resistance of 0.13 ohms and a 60 cycle impedance of 0.53 ohms, while
the 0.2-ampere tap has a 7-ohm DC resistance and a 52-ohm 60 cycle impedance. The tap setting
used on the seal-in element is determined by the current drawn by the trip coil.
The 0.2-ampere tap is for use with trip coils that operate on currents ranging from 0.2 up to 2.0
amperes at the minimum control voltage. If this tap is used with trip coils requiring more than two
amperes, there is a possibility t h a t the 7-ohm resistance will reduce the current to so low a valu e th at
the breaker will not be tripped.
The 2-ampere tap should be used with trip coils that take 2 amperes or more at minimum control
voltage, provided the tripping current does not exceed 30 amperes at the maximum control voltage.
If the tripping current exceeds 30 amperes an auxiliary r e l a y s hould be used, the connections being