Skip to main content

Hitachi

Hitachi Industrial Components & Equipment

In equipment and machnery which include inching and plugging (negative - phase braking), make and break of large starting rush current of motor will occur frequently. Category AC4 is applied for such usage. The rating of electromagnetic contactor is AC3. However, Category AC4 can be applied by lowering the rating. Application examples for motors when assuming that starting rush current (inching current) of the motor is about 6 times that of the rated operational current are shown in Tables 1 and 2.

INCHING (AC4)

Motor capacity
(kW)
Inching ratio 50% Inching ratio 75 - 100%
Electrical life
0.1 million times
Electrical life
0.5 million times
Electrical life
0.1 million times
Electrical life
0.5 million times
200-240V 380-440V 200-240V 380-440V 200-240V 380-440V 200-240V 380-440V
0.1 H10C H10C H10C H10C H10C H10C H10C H10C
0.2
0.4
0.75 H20 H20 H20
1.5 H25 H20 H20 H35
2.2 H20 H35 H25 H25 H20 H50 H35
3.7 H25 H20 H65C H35 H35 H25 H80C H50
5.5 H35 H25 H80C H50 H65C H35 H150C H65C
7.5 H50 H35 H150C H65C H80C H50 H80C
9 H65C H50 H80C H65C H200C H150C
11 H80C H150C
13 H65C H200C H150C H80C H250C
15 H150C H150C H300C
18.5 H80C H250C H200C H400C H200C
22 H150C H300C H200C H250C H600C H300C
30 H200C H600C H250C H300C H200C H400C
37 H250C H200C H300C H600C H300C H600C
45 H300C H250C H600C H600C
55 H600C H300C
75 H600C

PLUGGING (AC4)

Motor capacity (kW) Plugging
Electrical life
0.1 million times
Electrical life
0.5 millioin times
200-240V 380-440V 200-240V 380-440V
0.2 H10B-R H10B-R H10B-R H10B-R
0.4
0.75 H20-R H20-R
1.5 H20-R H20-R H35-R
2.2 H25-R H50-R H35-R
3.7 H35-R H35-R H80C-R H50-R
5.5 H65C-R H50-R H150C-R H65C-R
7.5 H80C-R H65C-R H80C-R
11 H150C-R H80C-R H200C-R H150C-R
15 H150C-R H300C-R
18.5 H200C-R H400C-R H200C-R
22 H250C-R H600C-R H300C-R
30 H300C-R H200C-R H400C-R
37 H600C-R H300C-R H600C-R
45 H600C-R

Note

*1
Inching ratio (%) means
Inching ratio (%) means
*2
Please enquire when using high inching frequency machine tools, hoists, cranes, etc., with an inching ratio of about 75 - 100%

Brochures & Enquiry