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An open pilot wire will result in undercurrent detection; a shorted pilot wire will
result in overcurrent detection, and ground on either conductor of the pilot wire will result
in ground detection.
TEMPERATURE
These relays have been designed for continuous operation in ambient temperatures
between -20oC and
+
levels will vary by not more than three percent (3% ) from their nominal values at 20oc.
In addition, these relays will not malfunction nor be damaged if operated in an
ambient up to 65oC.
DIELECTRIC STRENGTH (AC HIGH-POTENTIAL TEST)
For the purposes of dielectric tests, the SPA relays are rated 600 volts. Per ANSI/IEEE
C37.90-1978, the high-potential test voltage is 2200 volts AC for one minute. As described
in the standard, relays other than new should be tested at 75% of this voltage.
CONTACTS
The telephone-relay output contacts in the SPA will make and carry 30 amperes for
tripping duty and will make and carry 3 amperes continuously. The interrupting ratings
are given in Table II.
INTERRUPTING CURRENT RATINGS OF TELEPHONE-TYPE RELAY CONTACTS
AC VOLTS
115
230
DC VOLTS
48
125
250
t
GEK-65512
RATINGS
55oC per ANSI Standard C37 .90-1978. Over this range, the detection
TABLE II
AMPS
t
INDUCTIVE
0.75
0.5
1.0
0. 5
0.25
5
NON-INDUCTIVE
2.0
1. 5
3.0
1. 5
1.0
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