Cutler Hammer, Div of Eaton Corp RMS 610, RMS 910 Catalog Page
45-10
Circuit Breakers & Supplementary Protectors
15 – 2500 Amperes for UL, CSA & IEC Applications
August 2006
Frame Sizes JG through LG
45
Multi-Function Electronic
Trip Units for All Applications
Digitrip RMS Trip Units
True rms Sensing
Digitrip RMS Trip Units utilize our
patented microprocessor-based intelligence to provide true rms sensing,
permitting increased accuracy and
reliable system protection. True rms
sensing is not susceptible to nuisance
tripping when waveforms containing
high harmonic currents are present.
Digitrip RMS 310
Digitrip RMS 310 Electronic Trip Units
are available with Cutler-Hammer
Circuit Breakers J- and L-Frames 20
through 600 amperes.
Digitrip RMS 310+
Digitrip RMS 310+ Electronic Trip Units
are available with Cutler-Hammer
Circuit Breakers JG and LG. They are
selectable long time delay (t
pickup settings (I
required. The Digitrip 310+ offers true
rms sensing, is front adjustable and
has an optional local display of current
and cause of trip.
). A rating plug is not
r
LD
) and
RCurve Shaping
When selectively coordinated systems
are called for, Digitrip RMS 310 will
provide a cost-effective solution for a
variety of applications.
The standard Digitrip RMS 310
includes an adjustable short time
pickup setting encompassing an I
ramp function which provides the
basic LS curve shaping function.
JG- and LG-Frames have an
adjustable long time delay.
JG- and LG-Frames have selectable
long time delay (t
tings (I
The optional Digitrip RMS 310
provides additional flat response
short time delay adjustments on
an instantaneous setting to provide
LSI curve shaping capability.
Digitrip RMS 310 Trip Units are
available with ground fault pickup
and flat response ground fault delay
which provides the trip unit with full
function LSG and LSIG curve shaping
flexibility.
Note: Contact factory for availability of
ground fault for LG-Frame trip unit.
Digitrip RMS 310 Trip Units can effectively coordinate with both sophisticated upstream power breakers as
well as downstream thermal magnetic
breakers…making Digitrip RMS 310
Trip Units the cost-effective reliable
choice for selectively coordinated
systems.
). A rating plug is not required.
r
) and pickup set-
LD
2
t
Thermal Memory
All Digitrip RMS Trip Units incorporate
a long delay. Thermal memory prevents
the system from cumulative overheating
due to repeated overcurrent events that
may occur in quick succession.
Field Testing
A field test kit is available for Digitrip
RMS 310 trip units.
Digitrip RMS 610 and 910
RMS 610
Digitrip RMS 610 and 910 Trip Units
are available with Cutler-Hammer
R-Frame Circuit Breakers 800 through
2500 amperes. Digitrip 610 and 910
Trip Units provide unparalleled
system protection with the added
convenience of a local display.
Curve Shaping
Digitrip RMS 610 and 910 Trip
Units are available with up to nine
curve shaping choices achieved by
adjusting up to seven switches on the
front of the unit for optimum system
coordination. Maximum curve shaping
flexibility is provided by dependent
long and short delay adjustments that
are long delay pickup (I
depicted on the front of the unit by the
blue portion of the time-current curve.
Additional coordination capability
can be provided by utilizing the short
delay and ground fault zone selective
interlocking features available on
these trip units.
RMS 910
) based,
r
For more information visit: www.EatonElectrical.com CA08102001E
Circuit Breakers & Supplementary Protectors
15 – 2500 Amperes for UL, CSA & IEC Applications
August 2006
Digitrip RMS Electronic Trip Unit Selection Guide
Table 45-5. Digitrip RMS Electronic Trip Unit Selection Guide
Digitrip RMS 310
Breaker Type
Cutler-Hammer Frame(s) JG-, LG-Frames
Ampere Rating 20 – 2500 A
Interrupting Rating at 415 V 35, 70, 100 kA
Trip Unit Sensing
rms Sensing Yes
Protection and Coordination
Protection Ordering Options LS, LSG LSI, LSIG
Fixed Rating Plug (I
Overtemperature Trip Yes Yes
Long Delay Adjustable Rating Plug (l
Long Delay Setting 0.5 – 1.0 (l
Long Delay Time I2t at 6x 10 Seconds
Long Delay Thermal Memory Yes Yes
High Load Alarm No No
Short Delay Short Delay Setting Var/Frame
Short Delay Time I2t 100 ms No
Short Delay Time Flat No I – 300 ms
Short Delay Time ZSI No No
Instantaneous Instantaneous Setting No 200 – 800% x (l
Discriminator No No
Instantaneous Override Yes Yes
Ground
Fault
Ground Fault Setting Var/Frame
Ground Fault Delay I2t at .62x No No
Ground Fault Delay Flat I – 500 ms
Ground Fault ZSI No No
Ground Fault Thermal Memory No No
System Diagnostics
Cause of Trip LEDs No No
Magnitude of Trip Information No No
Remote Signal Contacts No No
System Monitoring
Digital Display No No
Current No No
Voltage No No
Power and Energy No No
Power Quality — Harmonics No No
Power Factor No No
System Communications
PowerNet No No
Field Testing
Testing Method Test Set Test Set
JG- and LG-Frames have selectable settings
instead of a rating plug.
JG-, LG- and NG-Frames have adjustable
long delay times of 2 – 24 seconds.
JG/LG: 2X – 14X (In); NG: 2X – 8X (In);
RG: 2X – 8X (I
200 – 600% x (I
); 2500 ampere RG-Frame
n
).
n
)
n
)
n
Frame Sizes JG through LG
JG
LG/NG
RG
Ye s Ye s
Ye s Ye s
JG-Frame also has a 14X setting.
Not to exceed 1200 amperes.
JG- and LG-Frames are Instantaneous, 120 ms.
NG- and RG-Frames are Instantaneous, 100,
300 and 500 ms.
Note: In= Rating plug rating.
)
n
= Long delay setting.
I
r
0.5 – 1.0 (ln)
10 Seconds
Var/Frame
Var/Frame
I – 500 ms
45-11
)
n
45
CA08102001E For more information visit: www.EatonElectrical.com
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