Siemens 3RB12 User manual

Elektronisches Überlastrelais 3RB12

Solid-state overload relay

Relais de surcharge electronique

Relé electronico di sobrecarga

Relè elettronico di sovraccarica

Elektroniska överlastrelä

Betriebsanleitung

Instructions

Bestell-Nr./Order No.: 3ZX1012-0RB12-1AA1

Ausgabe/Edition 01/2003

GWA 4NEB 631 2282-30a

3RB1246-1P

3RB1246-1Q

3RB1246-1E

a10 15

b34 29

c29 24

d46 47

e48 ---

f 4 - - -

100

∅ 4,5

7, 2

127,5

100

3ZX1012-0RB12-1AA1

3RB1253-

3RB1257-

3RB1262-

a 120 145 230

b858585

c155 175 190

d 110 105 120

e405070

f∅ 7∅ 9∅ 11

g425270

h3748---

i 125 130 135

j414655

k203040

l 131 151 166

m 7,2 7,2 7,2

n 13 - - - - - -

o 145 160 175

idb

IIb

IIa

3ZX1012-0RB12-1AA1

III

NSB00302a

L1 L2 L3

T1 T2 T3

3RB12

3ZX1012-0RB12-1AA1

F2 F3 F4

K1E

135

642

135

L1 L2 L3

A2 A1

T1 T2 T3

642

CLASS

S1A

9896

K1E

S1E

Test/

Reset

K1 Overload

K2 Ground

Fault

Y1Y2

5, 10, 15, 20, 25, 30

Ground

Fault

H1 H3

05 07

06 08

Ready

Ground

Fault

Overload

T2/

Y1Y2

Automatic-

Reset

Remote-

Reset

T2/

3UL22

3 RB 12

⇑

K1E

3 ~

3RB12

3ZX1012-0RB12-1AA1

V3RB12..-...0

3RB12..-...2

60 70 80 90

100

20 25

Class

Test/

Reset

G/9401 3RB1246-1EM00

95 96 97 98 08070605

A1 Y1 Y2

A2 T1 T2/C1 C2

Overload

Gnd Fault

Ready

Reset

Gnd Fault

AC 220-240V J- -

3RB12

NC Overload NO NC Gnd Fault NO

3ZX1012-0RB12-1AA1

60 70 80 90

100

20 25

Class

Test/

Reset

G/9401 3RB1246-1EM00

95 96 97 98 08070605

A1 Y1 Y2

A2 T1 T2/C1 C2

Overload

Gnd Fault

Ready

Reset

Gnd Fault

AC 220-240V ϑ↑ ↑

3RB12

NC NO NC NO

Tripped

OVL-Warning

3RB12..-...1

3RB12..-...3

3ZX1012-0RB12-1AA1

VIII

VII

x Ie

12 580,7

100

120

s min

CLASS

CLASS 30

x Ie

12 580,7

100

120

s min

CLASS

CLASS 30

3ZX1012-0RB12-1AA1

Device description

3ZX1012-0RB12-1AA1 11

English

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!

1 Device description

The 3RB12 electronic overload relay protects electrical

equipment, such as three-phase AC motors and trans-

formers, with three different protection mechanisms.

Overload

protection The 3RB12 compares the motor current actually

flowing with the set current and evaluates the values

in a microprocessor.

Thermistor

protection PTC thermistors in the motor windings sense the motor

temperature. If the thermistor responds, the relay trips.

Earth-fault

protection 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.

WARNING

HAZARDOUS VOLTAGE

CAN CAUSE ELECTRICAL SHOCK

AND BURNS.

DISCONNECT POWER BEFORE PROCEEDING

WITH ANY WORK ON THIS EQUIPMENT.

Installation

12 3ZX1012-0RB12-1AA1

English

2Installation

For dimension drawings, see graphics section, Fig. I

and II.

Mounting position: any

Mounting of 70 mm devices:

■ Snap-on mounting on 35 mm mounting rail in con-

formity with EN 50 022 or

■ srew mounting by means of inserted lugs as

accessory (3RB1900-0B).

Mounting of the 120 mm, 145 mm und 230 mm

devices:

■ Crew mounting integrated in the casing.

■ In addition for 120 mm size:

Baseplate for snap-on fastening on 75 mm mount-

ing rail (3UF1900-0J) available as accessory.

3 Connection

3.1 Main conductor connection

3.1.1 Current range up to 100 A

■ Rated motor currents from 1.25 A to 100 A:

Insert the motor leads per phase through the open-

ings (x) in the unit (see graphics section, Fig. Ia).

■ Rated motor currents less than 1.25 A:

Insert the motor leads per phase through the open-

ings (x), take them back through the loop opening (y)

and insert them again through the openings (x). You

will produce two loops in this way (see graphics sec-

tion, Fig. Ia).

The following table lists the number of loops for the

various rated motor currents.

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