Page 787 - ABB_Motor _Protection_and_Control_catalogue_20221216

ABB MOTOR PROTECTION AND CONTROL 6/49

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EF460, EF750, EF1250DU electronic overload relays – 150 to 1250 A

Technical data

Main circuit – Utilization characteristics according to IEC/EN
Type EF460 EF750 EF1250DU
Standards IEC/EN 60947-1, IEC/EN 60947-4-1, IEC/EN 60947-5-1
Rated operational voltage Ue 1000 V AC
Rated frequency 50/60 Hz – not suitable for DC applications
Trip class 10E, 20E, 30E, selectable
Number of poles 3
Duty time 100%
Operating frequency without early tripping Up to 15 operations/h, see "Technical diagram – Intermittent periodic duty"
Rated impulse withstand voltage Uimp 8 kV
Rated insulation voltage Ui 1000 V AC
Auxiliary circuit according to IEC/EN
Type EF460 EF750 EF1250DU
Rated operational voltage Ue 600 V AC / DC
Conventional free air thermal current Ith 6 A
Rated frequency DC, 50/60 Hz
Number of poles 1 N.C. + 1 N.O. 06
Ie / Rated operational current AC-15
acc. to IEC/EN 60947-5-1 for utilization category
110-120 V 50/60 Hz 3.00 A
220-230-240 V 50/60 Hz 3.00 A
400 V 50/60 Hz 1.10 A
480-500 V 50/60 Hz 0.75 A
Ie / Rated operational current DC-13
acc. to IEC/EN 60947-5-1 for utilization category
24 V 1.50 A
60 V 0.55 A
110-120-125 V 0.55 A
250 V 0.27 A
Minimum switching capacity 12 V / 3 mA
Short-circuit protective device 6 A, fuse type gG
Rated impulse withstand voltage Uimp 6 kV
Rated insulation voltage Ui 690 V

Technical diagram – Intermittent periodic duty
(Op/h) Trip class 10E (Op/h) Trip class 20E (Op/h) Trip class 30E
50
a
160 t = 0.5 s 80 45 t = 5 s
a
a
140 70 40
t = 2 s
switching frequency 100 t = 1 s switching frequency 50 t = 4 s switching frequency 30 t = 10 s
120
35
60
25
a
80
40
a
a
20
60
30
a
t = 1.5 s
a
40
a
a
10
a
t = 3 s 20 t = 8 s t = 6 s 15 t = 15 s
a
a
20 10 t = 10 s t = 20 s
a
t = 5 s t = 12 s 5 t = 25 s
a
a
0 2CDC232001F0214 0 2CDC232002F0214 2CDC232003F0214
0 20 40 60 80 100 (%) 0 20 40 60 80 100 (%) 0 0 20 40 60 80 100 (%)
duty ratio duty ratio duty ratio
Trip class 10E Trip class 20E Trip class 30E