*
GEK-65525
A stainless ball
(
B
)
is placed in the tube before the diaphragm is assembled.
When
the moving contact hits the stationary contact, the energy of the former is imparted
to the latter and then to the ball, which is free to roll up the inclined tube.
Thus, the moving contact comes to rest with substantially no rebound or vibration.
There is a High-Seismic target and seal-in unit whose coil is in series with the
normally-open left contact.
The High-Seismic target and seal-in unit•s contact is
brought out to a separate terminal.
See Figure 1 and the
APPLICATION
section for
external wiring.
When the normally-open CCP contact closes, the target and seal-in unit will pick up
if the current is above its pickup rating.
When the target and seal-in unit picks
up, it raises a target that latches up and remains exposed until reset by the reset
mechanism located at the lower left-hand corner of the cover assembly.
RATINGS
Relays are available with potential coils rated 115 or 208 volts, 60 hertz. The 50
hertz relay is available with potential coils rated for 115 or 208 volts.
The current coils of all models are rated 5 amperes continuously, or 200 amperes for
1 second.
The relay has maximum torque when the three-phase system is a unit power factor if
the relay is connected as shown in Figure 2.
The balanced three-phase current to
operate the relay at maximum torque angle and with rated voltage on the potential
circuits will be between 0.004 and 0.016 amperes, depending on the relay control
spring setting.
The High-Seismic target and seal-in unit ratings are shown in Table I.
TABLE I
TAP
0.2
2.0
+10%
8.0
0.24
Minimum Operating
(
Amp.
)
+0 - 25%
0.2
2.0
Carry Continuous
(
Amperes
)
0.3
3.0
Carry 30 Amps for
(
Sec.
0.03
4.0
Carry 10 Amps for
(
Sec.
)
0.25
30.0
60 Hertz Impedance
(
Ohms
)
68.6
0.73
If the tripping current exceeds 30 amperes, an auxiliary relay should be used, the
connections being such that the tripping current does not pass through the contacts
or the target and seal-in coils of the protective relay.
BURDENS
The current-circuit burdens with 5 amperes flowing and pickup set for minimum are
listed in Table II.
*
Revised since last issue
6
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