Technical data
20 3ZX1012-0RB12-1AA1
English
Short-circuit
protection
Main circuit
Short-circuit protection with fuses for motor feeders with
short-circuit currents up to 50 kA at 690 V, 50/60 Hz (see
data given in catalog)
Control circuit
Fuse links, duty class gL/gG 6 A
quick-acting 10 A
Protective circuit-breaker 1.6 A
C characteristic
Thermistor
protection
Thermistor sensor in the motor is connected to terminals
T1/T2
Total cold resistance R
cold
1.5 kΩ
Measuring circuit loading ≤ 5 mW
(at R
cold
= 1.5 kΩ)
Voltage at sensor circuit ≤ 2 V (at R
cold
= 1.5 kΩ)
Response value 2.7 to 3.1 kΩ
Return value 1.5 to 1.65 kΩ
Earth fault
protection
The following information based on sinusoidal fault
currents of 50/60 Hz:
external
Summation current transformers 3UL220.-.A are con-
nected to terminal C1/C2. The pick-up delay is 200 ms ≤
t ≤ 500 ms.
internal
With a motor current between 0.3 and 2 times the set
current, the device trips in the event of an earth-fault cur-
rent of 30% of the set current.
With a motor current between 2 and 8 times the set cur-
rent, the device trips in the event of an earth-fault current
of 15% of the set current.
The pick-up delay is 0.5 to 1 seconds.
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