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Characteristics 0
Solid-State Overload Relays 0
Motor Logic
®
Plus II programmable unit
Trip Class (TC)
The trip class for overload protection, described in the following table, defines the trip delay upon detection of a
thermal overload. (Refer to the tripping curves.) The motor and application determine the trip class. Consult the
motor manufacturer for the proper setting.
Note: Class 20 is the default setting for all Motor Logic Plus units.
Trip Class Application Description
5 Small, fractional-horsepower motors where acceleration time is almost instantaneous or where
extremely quick trip times are required
10 (Fast Trip) Hermetic refrigerant motors, compressors, submersible pumps, and general-purpose motors that
reach rated speed in less than 4 seconds
15 Certain specialized applications
20 (Standard Trip) Most NEMA general-purpose motors are protected by this setting
30 (Slow Trip) Motors with long acceleration times (>10 seconds) or high-inertia loads
J Prefix Programming any trip class with the J prefix enables jam protection. This additional protection is
enabled 1 minute after the motor starts and provides a 2 second trip time for motors exceeding 400%
of the overcurrent setting, regardless of trip class.
Tripping curves
Average operating time
related to multiples of the
current setting
1
10
100
1000
10000
0 100 200 300 400 500 600 700 800 900 1000
1
2
Time (s)
1 Class 10
2 Class 20
Motor Logic Plus II devices
% of OC setting
General, description:
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References:
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Dimensions:
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