22
(a) Phase-current detecting method
3 Contactor Method
Fig. 19 Connection diagram
Table 17. Selection (Phase-current detecting method)
Thermal Overload Relay
Voltage
Motor
Capacity
(kW)
Starter for
insulation
(52+49)
Contactor for
Star
(6)
Contactor
For Delta
(42)
RC(A)
Adjustable
Range (A)
Type
5.5 H20-T,HS20-T
H20,HS20
7.5 H25-T,HS25-T
H25,HS25
15 12 ~ 18 TR20B-1E
11 H35-T,HS35-T
H20,HS20
H35,HS35
15 H25,HS25
28 22 ~ 34
18.5
H50-T,HS50-T
H50,HS50
40 32 ~ 48
TR50B-1E
22 H65C-T
H35,HS35
H65C 55 45 ~ 65
30 H80C-T H50,HS50 H80C 67 55 ~ 80
TR80B-1E
37 H100C-T H100C
45 H125C-T
H65C
H125C
80 65 ~ 95
55 H150C-T H80C H150C 105 90 ~ 120
TR150B-1E
75 H200C-T H125C H200C 1.4 1.1 ~ 1.7
90 H250C-T H150C H250C 2.4 1,7 ~ 2.9
TR250B-1E
110 H300C-T H200C H300C
132 H250C
2.4 1,7 ~ 2.9
200V
150
H400C-T
H300C
H400C
3.8 2.8 ~ 4.4
TR400B-1E
5.5 6.8 4.5 ~ 9.0
7.5
11
H20-T,HS20-T
H20,HS20
9 7 ~ 11
15 H25-T,HS25-T
H20,HS20
H25,HS25 15 12 ~ 18
TR20B-1E
18.5 H35-T,HS35-T
H25,HS25 H35,HS35
22
20 16 ~ 24
30
H50-T,HS50-T
H35,HS35 H50,HS50
28 22 ~ 34
TR50B-1E
37 H50,HS50
45
H65C-T H65C 40 32 ~ 48
55 H80C-T
H65C
H80C 55 45 ~ 65
TR80B-1E
75 H100C-T H80C H100C
90 H125C-T H100C H125C
80 65 ~ 95
110 H150C-T H125C H150C 105 90 ~ 120
TR150B-1E
132 H200C-T H200C
150 H250C-T H250C
1.4
1.8
1.1 ~１.7
1.4～2.2
TR250B-1E
190 H300C-T
H200C
H300C
400V
260 H400C-T H300C H400C
2.4 2.0 ~ 2.8 TR400B-1E
Note: The RC values of thermal overload relays are based on Hitachi general-purpose squirrel cage motors
(Rated current × 0.58).
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