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If replacement control unit has different featuresthan old control unit, terminal block (secondarydisconnects) on the circuit breaker and/or cradlemay have to be added or removed. Contactfactory for more information.
Neutral plug is only available on4-pole circuit breaker or 3-pole circuitbreaker with external neutral sensorconnection.
0 6 3 1 3 3 2 3
0 6 3 1 3 3 2 4
CAUTIONHAZARD OF EQUIPMENT DAMAGE
Connect wires to match phase sequence(N, 1, 2, or 3) between trip unit and circuitbreaker.
Failure to follow this instruction can result inequipment damage.
This is an instantaneous tripping test (trips inless than one second) using a single-phaseprimary current injection between the line andload of each pole of the circuit breaker.
This tests the connection of thecurrent sensor to the control unitonly. This test is not designed tocalibrate the circuit breaker .Calibration tests are completedat the factory before shipping eitherthe circuit breaker or the control unitalone.
Test control unit according to the appropriate
table:• STR18M: see table 1• STR28D: see table 2• STR38S, STR58U
— with ground-fault protecton: see table 3 — without ground-fault protection: see
table 4
Io = rating plugIn = sensor ratingIr = long time pick up
tr = long time delaylm = short time pick uptm = short time delayI = instantaneous pick upIh = ground fault pick upth = ground fault delay
Table 1: STR18M
Testing Procedure Current to Inject*
1. Record the control unit settings.2. Adjust settings:
instantaneousl = 2
3. Program the injection time to 1500 ms.4. Inject the current pole-by-pole.5. Reset the control unit to the original settings.
Electrical equipment should be serviced only by qualified personnel. No responsibilityis assumed by Schneider Electric for any consequences arising out of the use of thismaterial. This document is not intended as an instruction manual for untrainedpersons.
Square D CompanyPO Box 30693700 Sixth St SWCedar Rapids IA 52406-3069 USA1-888-SquareD (1-888-778-2733)www.SquareD.com