TC855 datasheet(49/114 Pages) ALLEN-BRADLEY

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Rockwell Automation Publication 100-TD013J-EN-P - April 2021

100-C/104-C, 100S-C/104S-C, 100Q-C Contactors

Life-Load Curves

Bulletin 100-C/104-C IEC contactors are designed for superior performance in a wide variety of applications. When selecting IEC products,

the user must give consideration to the specific load, utilization category, and required electrical life of the application. The life-load curves

shown here are based on Rockwell Automation tests according to the requirements defined in IEC 60947-4-1. Since contact life in application

is dependent on environmental conditions and duty cycle, actual application contact life may vary from that indicated by the curves shown

here.

To find the estimated electrical life of the contactor, follow these guidelines:

Identify the appropriate utilization category from Table 23.

2. Choose the graph for the utilization category selected.

3. Locate the intersection of the life-load curve for the appropriate contactor with the application’s operational current (Ie) found on the

horizontal axis.

4. Read the estimated contact life along the vertical axis.

Contact Life for Mixed Utilization Categories AC-3 and AC-4:

In many applications, the utilization category cannot be defined as either purely AC-3 or AC-4. In those applications, the electrical life of the

contactor can be estimated from the following equation:

Lmixed = Lac3/[1 + Pac4*(Lac3/Lac4 – 1)], where:

Lmixed = Approximate contact life in operations for a mixed AC-3/AC-4 utilization category application

Lac3 = Approximate contact life in operations for a pure AC-3 utilization category (from the AC-3 life-load curves)

Lac4 = Approximate contact life in operations for a pure AC-4 utilization category (from the AC-4 life-load curves)

Pac4 = Percentage of AC-4 operations

Table 23 - Utilization Category Determination

Test Conditions

Making

Breaking

/Ie

U/Ue

cos

Ic/Ie

Ur/Ue

cos

AC-1

Resistance Furnaces:

Non inductive or slightly inductive loads

0.95

AC-2

Slip-ring motors:

Starting and reversing

2.5

0.65

2.5

0.65

AC-3

Squirrel-cage motors:

Starting and stopping of running motors

Ie < 17 A

Ie > 17 A

0.65

0.35

0.17

0.65

0.35

AC-4

Squirrel-cage motors:

Starting, plugging(1), inching(2)

(1)

Plugging is understood as stopping or reversing the motor rapidly by reversing motor primary connections while the motor is running.

(2) Inching (jogging) is understood as energizing a motor once or repeatedly for short periods to obtain small movements of the driven mechanism.

Ie < 17 A

Ie > 17 A

0.65

0.35

0.65

0.35

AC-15

Solenoids:

Contactors, valves and lifting magnets

0.7

0.4

• Ie Rated operational current

• Ic Breaking Current

• Ue Rated voltage

• I Making Current

• U Off-load voltage

•Ur Recovery voltage

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