Cut Sheet

V4-T1-78 Volume 4—Circuit Protection CA08100005E—August 2015 www.eaton.com
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1.3
Miniature Circuit Breakers and Supplementary Protectors
UL 1077 DIN Rail Supplementary Protectors
Technical Data and Specifications
Trip Curves Chart
Eaton FAZ supplementary
protectors are available with
six different tripping
characteristics, including
Type B, C, D, K, S and Z.
Definitions for each trip curve
are contained on the ordering
pages and can be used to
determine the optimal
characteristic for your
application. For example,
low-level short-circuit faults in
control wiring, such as PLCs,
are best protected by devices
with Type B trip characteristics
(3–5X continuous rating of the
device (I
n
).
Even though not required by
NEC or CEC for supplementary
protectors, Eaton’s FAZ
devices are current limiting,
which means that they
interrupt fault currents
within one half cycle. Current
limiting devices offer superior
protection by reducing
peak let-through current
and energy.
Tripping Characteristics
I/I
n
ZBCKS
D
1 2 3 4 5 6 7 8 9 10 15 20 30 40 50
7200
3600
1200
600
300
120
60
30
10
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
0.005
0.002
0.001
0.0005
t (sec)
1.05 1.30
1.13
1.45
Time-current characteristic acc. to UL 1077

Conventional
non-tripping current
I
nt
= 1.13 I
N
: t > 1 h

Conventional tripping
current
I
t
= 1.45 I
N
: t < 1 h

2.55 I
N
:
t = 1–60 s (I
N
< 32A)
t = 1–120 s (I
N
< 32A)

Type B: 3 I
N
: t > 0.1 s

Type B: 5 I
N
: t < 0.1 s

Type C: 5 I
N
: t > 0.1 s

Type C: 10 I
N
: t < 0.1 s

Type D: 10 I
N
: t > 0.1 s

Type D: 20 I
N
: t < 0.1 s