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These are single-phase, sensitive overvoltage relays of the induction disk construction. They are
equipped with a time dial so as to provide adjustable time delay in their operation. The relays are
principally applicable for sensitive overvoltage ground detection for high-impedance grounded
generators or for ungrounded power systems. The differences among the four relays are as indicated
in Table A below. Each relay is mounted in a standard size S1 drawout case and the outline and
panel drillings are shown in Figs. 14 and 15; Fig. 13 shows the outline for an external capacitor when
used. The internal connections of the relays are indicated in the table. Each relay contains a target
seal-in unit that is used to protect the relay main contacts and control spring from damage due to
breaker-trip current.
CONTINUOUS
RATING**
(VOLTS)
IAV51D
115
199
345
IAV51K
67
IAV52C
115
199
345
IAV52D
199
IAV52K
67
* The two normally-open contacts have a common connection; refer to the internal connections of
the relay.
** All relays have a 360 volt 10 second rating.
GEK-45404
DESCRIPTION
TABLE A
PICKUP
RANGE,
TAPS
VOLTS
10-40
16-64
YES
28-112
5.4-20
YES
9.2
16
NO
28
16-64
YES
5.4-20
YES
3
INTERNAL
CONTACTS
CONNECTIONS
FIGURE
1NO
1NO
2NO*
2NO*
2NO*
1
2
3
4
5
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