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Device Description; Limited Touch Protection; Overload Protection; Thermistor Protection - Siemens 3RB12 Instructions Manual

Solid-state overload relay
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Device description

Overload
protection
Thermistor
protection
Earth-fault
protection
3ZX1012-0RB12-1AA1

Limited touch protection

Degree of protection in conformity with IEC 60529:
IP 20 for devices 70 mm
IP 00 for devices > 70 mm
Shock-proof in conformity with DIN VDE 0106, Part
100.
Installation and maintenance by technical personnel
only. Follow the operating instruction!
WARNING
DISCONNECT POWER BEFORE PROCEEDING
WITH ANY WORK ON THIS EQUIPMENT.
The 3RB12 electronic overload relay protects electrical
equipment, such as three-phase AC motors and trans-
formers, with three different protection mechanisms.
The 3RB12 compares the motor current actually
flowing with the set current and evaluates the values
in a microprocessor.
PTC thermistors in the motor windings sense the motor
temperature. If the thermistor responds, the relay trips.
Versions with internal earth-fault detection are suitable
for service in three-wire systems.
Versions with earth-fault detection by means of an
external summation current transformer are suitable
for service in three-wire and four-wire systems.
HAZARDOUS VOLTAGE
CAN CAUSE ELECTRICAL SHOCK
AND BURNS.
Device description
11

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