5
Instruction Booklet
IB 33-790-1J
Effective November 2010
Instructions for Low Voltage Power
Circuit Breakers Types DS and DSL
EaToN CorPoraTIoN www.eaton.com
Recommended Safety Practices
Type DS circuit breakers are complex electrical devices
containing high speed, high energy, operating mecha-
nisms. They are designed to operate within the current
and voltage limitations on the breaker nameplate. Do not
apply these breakers to systems with currents and/or
voltages exceeding these limits.
1. To perform work on Type DS Circuit Breakers
requires personnel with training and experience in
high voltage circuits. Only qualified electrical work-
ers, familiar with the construction and operation of
such equipment and the hazards involved, should be
permitted to work on these circuit breakers.
2. Only Qualified Persons as defined in the National
Electric Safety Code should be permitted to assem-
ble, operate or maintain these breakers.
3. The breakers are equipped with various interlocks.
DO NOT MAKE ANY OF THE INTERLOCKS INOP-
ERATIVE AS THIS MAY RESULT IN BODILY
INJURY OR PROPERTY DAMAGE.
4. Never put a breaker into a cell without barriers and
arc chutes.
5. Always be sure that all switch hardware is in place
and bolted tightly before inserting breaker into cell.
6. Do not lift breaker with ordinary crane hooks, ropes,
chains, etc., to avoid possible damage to parts or
dropping the unit. Use breaker lifting adapter.
7. Use handle on front panel of circuit breaker to move it
into or out of cell. Keep fingers and hands off top, bot-
tom or sides of breaker when moving it into or out of
cell to prevent bodily injury.
8. When operating breaker without arc chutes and barri-
ers, keep hands, arms, head and tools out of area
where contacts travel. Severe bodily injury could
result from being struck by the moving contacts
either as they open or close.
9. Be sure circuit breaker contacts are open and closing
springs are discharged before doing maintenance
work.
10. Be sure circuit breaker contacts are open and closing
springs are discharged after completing maintenance
work.
11. Never leave breaker in an intermediate position in a
cell. Always have the breaker either in the discon-
nect, test or connected position because control cir-
cuits may be either improperly connected (or
disconnected) and may cause electrical failures.
12. Avoid trip-free type operation because it causes
more shock on some parts of breaker than normal
closing operations. Refer to last paragraph in Item 4.1.
13. Before operating breaker in test position, be sure that
closing the breaker will not cause another electrically
interlocked breaker to inadvertently trip.
