Dimension Drawings; Circuit Diagrams; Tightening Torques - Siemens 3TB50 Instructivo

Contactors with extended
tolerance
Operating Instructions
DANGER
!
Hazardous voltage.
Will cause death or serious injury.
Turn off and lock out all power supplying this device before
working on this device.
Installation and maintenance work on this device may only be carried
out by an authorized electrician.
NOTICE
This product has been designed for environment A. Use of this product in
enviroment B may cause unwanted electromegnetic distrubances in which case
the user may be required to take adequate mtigation measures.
The coils of the contactors have a large tolerance from 0.7 to 1.25 x Us and
are fitted with varistors as standard to provide protection against voltage
surges. As a result the opening delay is 2 ms to 5 ms longer than that for
standard contactors.
A series resistor must be used to change the DC solenoid systems of the
3TB and 3TC contactors to a holding excitation state.
This series resistor is contained in the contactors. For types 3TB50 and
3TC48, the series resistor must be attached and wired onto the right-hand side
of the auxiliary switch block using the enclosed mounting parts (use only the
original screws, do not use longer screws) and sets of links provided. The
3TC44 must be mounted and wired between the contactor poles. For types
3TB52/54/56 and 3TC52/56, the series resistor must be attached separately
next to the contactors. One NC of the auxiliary contacts is required for the
series resistor function. The selection and ordering data shows the number of
additional, unassigned auxiliary contacts. It is not possible to extend the
number of auxiliary contacts.
For the 3TB52 and 3TC52 and larger contactors, the series resistor must be
connected via an additional reversing contactor (3RT1317 / 3RT2317). This
contactor is automatically included in the delivery in the same packaging as
the contactor.
All specifications and technical data not mentioned here are identical to those
of the standard 3TB and 3TC contactors.

Circuit diagrams

Circuit with series resistor
Rv (size 2 or larger)
Without reversing contactor
L
L
S1
31
K1
Rv
32
A1
K1
A2
NSB00715
2
Circuit with series resistor Rv and
K2 reversing contactor
(for size 8 K1 contactors or larger)
L+
L-
S1
21
K2 K2
K1
22
Rv
K2
K2
K1 A1 K2 A1
NSB01357 A2 A2
Rv: Two resistors are connected in
series for 3TB54, 3TB56 and 3TC56
contactors.
K2: 3RT1317-1F.40
3RT2317-1F.40
3TB50, 3TB52, 3TB54, 3TB56
3TC44, 3TC48, 3TC52, 3TC56
IP00

Dimension drawings

3TC44 17-0L contactor
Size 2, DC operation
82
70
50
8
4,8 M5 M3,5
Ø
Varistor t = min. clearance from insulated compts.: 15 mm (≤ 600 V and > 600-750 V)
Additional space requirements for mounting resistors and varistors
with 3TB50 to 3TB56 and 3TC48 to 3TC56 contactors
Contactor
a
Á
Varistor
mounted
Additional space
For contactor requirements for series
resistor or varistor
c
3TB50 30
3TB52, 3TB54, 3TB56 —
3TC48 30
3TC52, 3TC56 —
*) Terminal compartment
Separately mounted series resistor
¿
Â

Tightening torques

Resistor fixing
¿
Fixing bracket
À
Varistor fixing
Á
Resistor terminals
Â
See contactor operating instructions for further details.
141
t
109
4
NSB00848
from earthed compts.: 30 mm (≤ 600 V and > 600-750 V)
c
Space for
mounting resistor
a b b *
1 2
13 70 110
15 82 120
13 70 110
15 82 120
For No. of series
contactor resistors
3TB52, 3TC52 1
3TB54, TB56 2
3TC56 2
2,5 Nm
0,9 Nm
0,9 Nm
0,9 Nm
3ZX1012-0TB50-1BA1
English
¿
Series
resistor
À