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Hitachi

Hitachi Industrial Equipment Systems Co., Ltd.

Magnetic Starters & Contactors : Selection : Application to DC Load

The breaking category of DC load becomes far more severe in comparison with AC load. However, electromagnetic contactor can be applied as shown in Table 4.

TABLE 4
Type of load Time constant L/R (ms) Voltage DC (V) NO. of series contacts Frame and rated operational current (A)
8C, 10C, 11 20 25 35 50 65C 80C 100C
125C		 150C 200C
250C		 300C
400C		 600C
Resistance load Less than 1 24 1 15 25 30 50 60 70 90 120 170 200 300 600
48 1 15 25 30 50 60 70 90 120 170 200 300 600
2 15 25 30 50 60 70 90 120 170 200 300 600
110 2 15 25 30 50 60 70 90 120 170 200 300 600
3 15 25 30 50 60 70 90 120 170 200 300 600
220 3 15 25 30 50 60 70 90 120 170 200 300 600
DC motor Less than 15 24 1 6 10 10 20 20 25 35 40 60 100 150 300
48 2 6 15 15 20 20 25 50 60 80 120 150 300
3 10 20 20 30 30 35 80 90 120 180 200 300
110 2 4 8 8 10 10 15 30 40 60 100 150 300
3 8 15 15 20 20 30 60 80 100 150 200 300
220 3 4 8 8 10 10 12 30 40 60 80 100 200
Coil load Less than 40 24 1 3 5 5 7 7 10 20 20  
48 1 3 5 5 7 7 10 20 20
2 5 15 15 20 20 25 50 60
110 2 3 5 5 7 7 10 20 20
3 7 15 15 20 20 25 50 60
220 3 3 4 4 5 5 5 7 7
Less than 100 24 1 2 3 3 5 5 7 10 10
48 1 2 3 3 5 5 7 10 10
2 5 7 10 15 15 15 30 35
110 2 2 3 3 5 5 7 10 10
3 5 7 10 15 15 15 30 35
220 3 2 3 — — — — — —

Note

*1
Contact series connection method
Contact series
*2
Electrical life is 0.25 million times.

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