Technical Data
Effective: May 1998Page
8
TD.44A.01.T.E
Cutler-Hammer
1. The end of the curve is determined by the interrupting rating of the
circuit breaker.
2. For phase time/current curves, see curves 70C1006 and 70C1007.
3. The curve is shown as a multiple of the Rating Plug (l
n
).
4. The ground fault settings have conventional 100%, ±10% as the pickup points.
5. Except as noted tolerances on current levels are ±10% of values shown in chart.
6. The ground fault pickup is limited to 1200A setting for non-international styles.
7. The rating plug is for 50 Hz and 60 Hz applications.
8. Curves apply from -20°C to +50°C ambient; temperatures above 95°C
cause automatic trip.
9. With zone interlocking on ground fault utilized and no restraining signal,
the minimum time band applies regardless of setting.
10. For additional curve tolerances contact Cutler-Hammer.
11. Total clearing times shown include the response times of the trip unit,
the breaker opening and the extinction of the arcing current.
Magnum DS
Metal-Enclosed
Low-Voltage Switchgear
Ratings
Table R12 – Magnum DS Circuit Breakers with Digitrip RMS 520 Trip Unit
Typical Ground Fault Time/Phase Current Characteristic Curve (G)
Curve No. 70C1008
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