Application
Hum idity and Fungus
All ferrous parts are zinc plated with either a yellow dichro
mate or phosphate finish. Zinc plating resists 96-hou r salt
spray test. Alloy steel components made of inherently corro
sion-resistant materials are not plated.
Current-carrying parts are either silver or tin plated for
corrosion protection and to assure re.liable electrical joints.
Molded cases a n d covers, and all internal insulators, a re
made from inorganic materials that are inherently fungus
proof.
Wiring Diagram, Secondary Terminals
All Power Break®
I I
breakers use the same dedicated second
ary terminals regardless of frame, rating, accessory or trip
unit combinations. The left side set of secondary terminals
are assigned to auxiliary switches. The right side set is as
signed to a l l other accessories and breaker functions.
Terminals are suitable for 121 #18 -#12 solid or stranded
copper wire. Tightening torque is 9 I b-ins.
Left s ide secondary
terminals "A" Block
48
Right side secondary
terminals "B" Block
Time Current Tripping Characteristics
Power Break
II
insulated case circuit breaker time current
curves are the engineering documents that define the tech
nical performance of the devices. I nformation provided on a
time current curve includes the following:
•
Product family type (s)
•
Specific device type (s)
•
Ampere ratings covered on curve
•
Overcurrent characteristics covered - long-time, short-
time, instantaneous, etc.
•
Maximum total clearing time
•
Maximum and minimum temperature limits
•
Frequency ratings
•
Voltage ratings
•
Specific trip unit ratings
•
Trip unit adjustment ranges
•
Tolerance (band width)
Multiples of circuit breaker trip ratings, or other suitable
current value (e.g., current sensor rating) are shown on both
the top and bottom horizontal axes. The time in seconds
is shown on the vertical axes. Approximate minimum and
maximum clearing time is readily determined from the char
acteristics curves. Tripping characteristics meet both NEMA
and U L standards for rating and calibration.
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