Eaton Digitrip RMS Series Instructional Leaflet Download

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Table 2. In general, plug ratings are available down through
50% of the current sensor rating.

The selection of available current sensors and rating plugs
coupled with the wide range of long-delay current pick-up
settings available on the Digitrip Trip Unit makes one set of
sensors suitable for a number of current ratings. The Digitrip
Trip Unit protection function settings are standard, and are
usable with standard sensors of any rating, up to the frame
rating of the circuit breaker.
If sensors are changed because of changing load conditions,
etc., it is only necessary to replace the rating plug and read-
just the Digitrip Trip Unit protection function settings to the
new desired values.

To insure the non-tampering of selected protection settings,
a sealable plexiglass cover as shown in Figure 1 is provided.
The cover is held in place by four cover screws. The non-tam-
pering feature is insured by the insertion of a standard meter
seal through the holes in two of the cover retention screws.

5.6 Potential Transformer Module

The Potential Transformer Module (PTM) is supplied with
the Digitrip RMS 810, 910 and OPTIM 1050 Trip Units. It is
mounted on the side of the Trip Assembly as shown in Fig-
ures 4 and 5. The PTM’s primary is connected to the circuit
breaker’s bottom end conductors. This module provides volt-
age for computing the energy monitoring parameters.

The PTM disconnect plug is mounted above the PTM as
shown in Figure 4. This plug must be disconnected prior to
any dielectric testing of the circuit breaker.



warNINg

DO NOT aTTEmpT TO pErfOrm DIElECTrIC (Or hIgh pOT Or
hIgh VOlTagE) wIThsTaND TEsTs ON ThE CIrCuIT BrEakEr
whIlE ThE pOTENTIal TraNsfOrmEr mODulE DIsCONNECT
plug Is CONNECTED. DEaTh Or sEVErE pErsONal INJury may
rEsulT aND ThE pOTENTIal TraNsfOrmEr mODulE aND TrIp
uNIT wIll BE DamagED.

rEmOVE ThE pTm DIsCONNECT plug prIOr TO pErfOrmINg
aNy DIElECTrIC (Or hIgh pOT Or hIgh VOlTagE) wIThsTaND
TEsTs. rEplaCE ThE plug afTEr all TEsTINg Is COmplETED
aND prIOr TO ClOsINg ThE BrEakEr as pEr ThE EsTaBlIshED
OpEraTINg prOCEDurEs.

6.0 Testing

6.1 Functional Field Testing

A functional local test of a major portion of the Digitrip’s
electronic circuitry and breaker’s mechanical trip assembly
can be verified using the trip unit’s test receptacle. The test-
ing can verify the desired trip settings by performing Long
Delay, Short Delay and Ground Fault functional tests. The
Digitrip model and its associated Test Kit/Auxiliary Power
Module requirements are listed in Table 5.

6.1.1 Secondary Injection Testing

The circuit breaker has a field test kit receptacle that can be
used for secondary injection testing to test Digitrip RMS or
Digitrip OPTIM Trip Units (Figure 4). With the Auxiliary Power
Module installed, the circuit breaker can be tested using sec-
ondary currents provided by an Amptector Trip Unit test kit
as illustrated in I.L. 33-791. Detailed instructions for testing
trip units are given in the individual trip unit instruction manu-
als referenced in Section 8.1.

Table 5 Digitrip Functional Testing Hardware

Digitrip Model

Testing Hardware

Digitrip RMS 510, 610,

Test Kit

810 and 910

(Style No. 140D481G03)

Test Kit Adapter

(Style No. 8779C02G01)

Auxiliary Power Module

(Catalog No. PRTAAPM)

Digitrip OPTIM