5
Instruction Leaflet
IL012001EN
Effective October 2013
Instruction Leaflet for the
KES 310+ Electronic Trip Unit
EATON
www.eaton.com
12. The Ground Fault Relay option will provide a SPST contact clo-
sure immediately before the breaker will trip on a ground fault
over current detect. This closure is momentary (50ms) and the
customer must provide the necessary external circuitry in order
to latch this signal. The yellow and green wires that exit the right
side of the breaker are the common (C) and normally open (NO)
of this relay.
otee:
N
The High Load Alarm Relay can be selected with LS, LSI, and LSG,
LSIG trip units. For the LSG and LSIG trip units, the High Load Alarm will func-
tion as normal. [11.] However, if the breaker trips due to a ground fault condi-
tion, the relay will respond with a ground fault alarm as indicated in [12.].
The Ground Fault Alarm Only can be selected for LSG and LSIG trip units only.
This selection has precedence over all other relay functions.
When the Ground Fault Alarm Only is selected, the High Load Alarm Relay
feature is not available.
otee:
N
The contact ratings of the relay are: 2A at 30 VDC and 0.5 A at
125 VAC.
13. The Zone Selective Interlock (ZSI) option provides a wired meth-
od of coordinating Upstream and Downstream breakers. The
coordinating signals are provided by the White\Red stripe (Zin),
White\Black stripe (Zout), and Black (common ground) wires that
exit the right side of the breaker.
A typical connection for a two breaker system is accomplished
by connecting the Zout wire of the downstream breaker to the
Zin of the upstream breaker. The common black wires of both
breakers must also be connected.
If a high current fault is sensed from the load on the down-
stream breaker, both breakers will sense the fault. However,
the downstream breaker will send the interlock signal to the
upstream breaker informing it not to trip defined by the SD time
settings of both breakers. This delay allows the downstream
breaker to clear the fault without the upstream breaker tripping.
However, if for some reason the downstream breaker does not
clear the fault in the set delay time, the upstream breaker will
then clear the fault.
otee:
N
This option must be ordered from the factory.
14. Zone Selective Interlocking is provided for the short delay and
the ground fault delay tripping functions for improved system
protection. The KES 310+ Trip Unit Zone Selective Interlocking
feature is compatible with OPTIM and Digitrip Trip Units, Model
510 and higher. It is also compatible with Series G: RG, NG LG,
JG, breakers, as well as, with FDE breakers.
The Zone Selective Interlocking feature is a means of commu-
nications over a pair of wires between two or more compat-
ible trip units. Zone Selective Interlocking makes it possible for
programmed trip unit settings to be altered automatically to
respond to different fault conditions and locations, thereby local-
izing the effects of an interruption and providing positive coordi-
nation between circuit breakers.
Three wires exit the breaker with the following color code and
function: White/Black Stripe=Zone Out, White/Red Stripe=Zone
In, and Black=Common.
An example of a Zone Interlock system would be a KES 310+. A
breaker used as the upstream breaker and a 225A FDE breaker
used as the downstream breaker. The Zout wire (white/black
stripe) of the 225A breaker would be connected to the Zin wire
(white/red stripe) of the KES 310+ breaker. Also both common
wired (black must be connected). There could be more breakers
added in a similar fashion to form a zone of protection.
For faults outside the zone of protection, the trip unit of the cir-
cuit breaker nearest the fault sends an interlocking signal (Zout)
to the trip unit of the up-stream circuit breaker. (Zin) This inter-
locking signal restrains immediate tripping of the upstream cir-
cuit breaker until its programmed coordination time is reached.
Thus zone selective interlocking applied correctly can reduce
damage due to circuit or ground fault conditions. A table of the
settings of the two breakers versus the outcomes (Both Trip,
Downstream (Dn) Trips) of the breakers is indicated below for
the conditions mentioned in the table heading.
Upstream
INST
120ms
300ms
Do
wnstream
INST
Both
Dn 43ms
Dn 43ms
120ms
Both
Dn 52ms
Dn 52ms
300ms
Both
Dn 43ms
Dn 43ms
otee:
N
A single Series G, FDE, or KD310+ breaker with the Zone Interlocking
feature enabled will not trip at the programmed time settings, unless Self
Interlocked. That is, the Zout wire should be connected to the Zin wire.
15. Remote Maintenance Mode (RMM) places the trip unit in the
2.5x instantaneous mode. For example, a 400 A (In) KD breaker
with the switch set to 2.5x would trip instantaneously when the
current exceeded 1000 A.
The Remote Maintenance Mode is enabled by applying 24VDC
to the two wire cable that exits the left side of the breaker. The
wires are color coded as follows:
24V and Black=common ground. A blue colored
LED, on the trip unit lights when the breaker is the Remote
Maintenance Mode.
The lighted blue LED indicates that the instantaneous setting of
the Maintenance Mode is enabled. This setting corresponds to
2.5x of In. Turning the Isd switch on the trip unit has no effect
on either the Maintenance Mode or the tsd\tg settings while the
blue LED is lit.
Also, a relay contact closure indicates that the Maintenance
Mode has been enabled. The blue and red wires are the C and
NO contacts of this relay. The relay has a dual function: 1)
enable RMM and 2) provide a contact closure indication that
RMM is enabled.
Both the yellow and black set of wires and the red and blue set
of wires exit the left side of the breaker.
otee:
N
The RMM and High Load\GFA Alarm contacts are rated at 2A at 30
VDC and 0.5A at 125 VAC.
