7
Breaker Features
1. FRONT PANEL: Thick 11-guage steel front panel
fits into a collar - frame in the equipment when the breaker
is in the CONNECT position, which provides a safe
grounded metal barrier between the breaker compart-
ment and the secondary device compartment. Well
marked and easy-to-read operating controls and indica-
tors include TRIP button, CLOSE button, OPEN/CLOSE in-
dicator, CHARGE/DISCHARGE indicator, OPERATIONS
counter and provision for manual charging the breaker.
2. PRIMARY DISCONNECT: The primary dis-
connect finger set is rugged and easy to inspect. De-
signed for optimum contact, built of silver-plated copper
and tested for continuous and momentary currents. These
disconnects provide proper contact integrity throughout
the life of the gear for the critical primary disconnect func-
tion.
3. CONTACT EROSION INDICATOR: GE
Vacuum interrupter contacts seldom wear out over the
normal duty life-span of a circuit breaker. Nevertheless,
a contact erosion indicator is provided for inspection con-
venience. It is visible when the breaker is withdrawn
from the compartment, or with the front panel removed.
4. INTERRUPTER SUPPORT: A rugged, high
strength, track-resistant polyester glass support assem-
bly firmly positions and holds the interrupter and primary
conductors while providing insulation to ground and be-
tween phases. This support assembly can be removed
quickly by disengaging six bolts. Only a simple alignment
of contact wipe is required in the unlikely event that the
interrupter assembly needs to be replaced.
5. BREAKER MECHANISM: Both ML-17 and ML-
18 mechanisms use a spring-charged, stored-energy de-
sign that is mechanically and electrically trip-free and
can be operated by dc control voltages of 48V, 125V, or
250V, or ac voltages of 115V, and 230V. High quality
mechanism parts are precision-tooled for operating con-
sistency, reliability, maintenance ease and plated for cor-
rosion resistance for long life.
6. ROLL-IN OPTION: A roll-in breaker designed for
use in the lower compartment of indoor switchgear or
outdoor walk-in is available in all breaker ratings. The
roll-in feature eliminates the need for a lift truck and re-
duces the required front aisle space. Upper compart-
ments may be left empty or used as auxillary compart-
ments. The breaker used for this option is the same as
used for the two-high product, with the addition of an
undercarriage.
4. Interrupter Support
5. Breaker Mechanism (ML-18)
6. Roll-in Option
f
This Project
ML-17
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