General Over-Current Protection; Figure 2. Rms Digitrip 810 Trip Unit - Block Diagram - Eaton Digitrip RMS 810 Instructions Manual

Instruction Leaflet I. L. 29-888B
Effective July 2011

Figure 2. RMS Digitrip 810 Trip Unit - Block Diagram.

In the event that control power is lost, the back-up battery in the
Rating Plug (see Section 1 .3 and Figures 1 and 9) continues to
supply power to the LEDs . To check the status of the battery, see
Section 4 .5 .
N otee: The Digitrip RMS 810 performs all of its protection functions regardless
of the status of the battery . The battery serves only to maintain the indication
of the reason for automatic trip .
Press and release the "TRIP RESET" push-button shown in Figure 1,
to turn "Off" the LEDs following a trip operation .
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Instructions for Digitrip RMS 810 Trip Unit

1.1.2 General Over-Current Protection

The Digitrip RMS 810 Trip Unit is completely self-contained and
when the circuit breaker is closed, requires no external control
power to operate its protection systems . It operates from current
signal levels and control power derived through current sensors inte-
grally mounted in the circuit breaker .
The Digitrip RMS 810 Trip Unit is available in six different types .
Each Trip Unit may be equipped with a maximum of five phase and
two ground (time-current) settings (see Section 3) to meet specific
application requirements . The protection available for each type is
summarized in Table 1, and illustrated in Figures 3 through 8:
protection Functions
Long Time / Instantaneous
Long Time / Short Time
Long Time /Short Time /
lnstantaneous
Long Time / Instantaneous
/ Ground
Long Time / Short Time /
Ground
Long Time / Short Time /
lnstantaneous / Ground
N otee: *RMS Digitrip Type LI, LS and LSI Trip Units can be applied on 3-pole or
4-pole circuit breakers for protection of the neutral circuit, IF the circuit break-
er is wired and MARKED for NEUTRAL PROTECTION . Refer to the National
Electric Code for appropriate application of 4-pole breakers .
type Figure
LI* 3
LS* 4
LSI* 5
LIG 6
LSG 7
LSlG 8