GE Industrial Solutions GERAPID 2508, 4008, 5008, 6008 WITH ARC CHUTE 1X2 - Manual (Page 7)

2011-03-14 S47183De rev.01 Design and specifications are subject to change without notice 7
3.2.5 ED impulse coil release
ED (electrodynamic) impulse release is a high speed trip coil,
and is intended to be used with external protective relays or
systems monitoring current increase. External relays must be
provided and installed by the customer. The ED coil must be
energized by a capacitor storage trip device. An optional
internal capacitor trip and control (NEKO), can be furnished
with the breaker or must be supplied by the user externally.
Rated voltage of 300 V and capacity of 2 000 µF is required. If
a fault is detected by the external relay, a firing signal must be
sent to the capacitors’ control unit (internal NEKO) causing
NEKO unit to discharge its energy into ED coil. If the capacitor
and controls are external, then user must supply the 300V
directly to the ED coil. The coil releases the quick latch and
opens breaker’s contacts in 3-4 ms. ED trip coil is an optional
accessory. It can be selected as a complete set consisting of
ED coil and electronic control unit with C-bank called NEKO, or
just the ED coil with user supplied capacitor trip unit .
The external release signal shall be 6 V to 24 V DC, and shall
be connected at terminals (-X2 :10 / :11) in standard wiring
scheme.
WARNING: Firing signal voltage of 6 VDC to 24 VDC must be
filtered. There should be no spikes on the signal of duration
less 3 ms. This can lead to defect of the NEKO board. Maximum
duration of the firing signal must not exceed ~1 sec. Longer
duration can cause the NEKO board to overheat! It is
recommended to use an auxiliary breaker contact in series
connection with firing circuit (-X2 :10/:11). It will automatically
cut off the firing circuit after breaker opening.
Fig. 8 ED impulse coil with seesaw interface
3.2.6 Auxiliary tripping devices
 The breaker can be equipped with either a shunt trip (ST) or a
zero voltage release (UVR). It is not possible to have both
devices installed in the same breaker. Both devices are
interchangeable.
 In normal configuration, the internal voltage converter
transforms the external voltage into 24 V DC, which is
required by standard ST or UVR. Both devices are tripped by a
dry contact connected as shown in section 4.3, [Fig. 27a] and
[Fig. 28]. Optionally, the ST can be ordered for connection
directly to an external 24 V DC (± 5%), 125 V DC or 220 V DC
supply. A double winding shunt trip coil is available with this
option for 125/220 V DC external control supply, for back-up
or redundancy.
 The ST is used for remote actuation and normal opening
operations.. It is designed for short time operation with max.
duty cycle of 9 %. ST’s supply is connected through auxiliary
breaker contacts, which cut off supply voltage after opening.
This protects ST against overheating.
WARNING: Manual closing of the breaker with ST installed,
while pushbutton OPEN is pressed and control power applied,
might lead to ST coil’s overheating and damage.
The UVR [Fig. 9] can be used for remote actuation and, in
combination with an internal electronic control, for voltage
control. The UVR releases at voltage interruption or supply
voltage drop below 20 V. In these cases UVR trips the breaker.
It is therefore possible to use this device in combination with
the electronic trip unit for voltage monitoring, where an
unintended re-start of machines after a temporary voltage
breakdown is to be prevented.
The UVR is intended for continuous operation. Its rated power
is 10 W. Due to its operational mode, the UVR is a self-
monitoring device, i.e. when the breaker is tripped upon a
break of the pilot wire (EMERGENCY-OFF principle).
Fig. 9 Zero voltage release in the mechanism’s module.
3.2.7 Forced tripping release
For drawout installations or as an manual trip interlock, the
forced tripping release (FT) is installed in the breaker [Fig. 10a]..
This unit, which mounts in the breaker base plate,
mechanically trips the breaker, by pressing the pin against the
seesaw linkage. Force required to trip the breaker is about
30 N (~7 ft-lb). The tripping pin position is as on Fig. 10b.
Fig. 10a Forced tripping release