GEI-86134, Power Circuit Breakers
TYPE ECS OVERCURRENT TRIP DEVICE
The ECS is a solid-state, direct-acting, self
powered trip device system that essentially dupli
cates SST except for the following:
1. Programmer units are limited to combinations
of Long Time, Short Time and Instantaneous trip
elements only. The Ground Fault element is not
available.
2. Fault indicators (trip targets) are not avail
able.
3. Phase sensors are not tapped. As listed in
Table
5,
each sensor has only a single ampere
rating. A different sensor is available for each of
the tabulated ampere ratings, which span the same
range as SST.
4. Neutral sensors are not required because there
is no Ground Fault function.
In all other respects the ECS trip device system
operates and can be treated identically to SST.
This includes circuitry, size, construction, com
ponent location, programmer unit set points, per
formance characteristics, operating range, quality,
reliability and the flux shift trip device. Use the
same troubleshooting and test procedures for
single-phase, high current-low voltage tests or
those employing the TAK-TSl Test Set. The Ground
Fault test procedures, of course, do not apply.
24
Fig. 29. ECS Programmer unit
1
))----
Fig. 30. ECS Block diagram
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