Page 601 - Motor_protection_and_control_Manual_motor_starters_ contactors

Mechanical latching units

Technical data
Type WB75-A

Utilization characteristics according to IEC
Rated insulation voltage Ui acc. to IEC 60947-1 690 V
Max. electrical impulse time
On AC coil (with load factor 5 %) 20 s
On DC coil (with load factor 3 %) 8 s
Min. electrical impulse time
For latching (energizing of the contactor coil) AC 50 ms (UA, GA contactors)
DC 50 ms (GAE contactors)
For pull-out (energizing of the WB block coil) AC 30 ms (UA, GA contactors)
DC 50 ms (GAE contactors)
Coil operating limits AC or DC supply 0.85…1.1 x Uc
AC control voltage 50/60 Hz 5
Rated control circuit voltage Uc 24…480 V AC
Coil consumption Average pull-in value 90 VA
Average holding value 60 VA
DC control voltage
Rated control circuit voltage Uc 24…440 V DC
Coil consumption Average pull-in value 110 W
Average holding value 110 W
Operating time
On contactor closing (latching)
Between coil energization and:
N.O. contact closing No difference with the operation of a contactor without mechanical latching unit
N.C. contact opening No difference with the operation of a contactor without mechanical latching unit
On contactor opening (unlatching)
Between WB coil energization and:
N.O. contact opening 5…25 ms
N.C. contact closing 7…28 ms
Mechanical durability
Number of operating cycles 1 million operating cycles
Max. switching frequency 3600 cycles/h with on-load factor of 8 %

Connecting characteristics
Connection capacity (min. ... max.)
Rigid solid 1 x 1...4 mm²
2 x 1...4 mm²
Flexible with ferrule 1 x 0.75...2.5 mm²
2 x 0.75...2.5 mm²
Lugs L < 8 mm
l L
l > 3.5 mm
Tightening torque Recommended 1 Nm
Max. 1.2 Nm
Screw terminals Delivered in open position, screws of unused terminals must be tightened
All terminals M3.5
Screwdriver type Flat Ø 5.5 / Pozidriv 2

1SBC101333S0201

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