SIEMENS
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Siemens IC 10 · 2017
Contactor Relays
3TH2 miniature contactor relays, 4- and 8-pole
5
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Overview
Standards
IEC 60947-1, EN 60947-1,
IEC 60947-5-1, EN 60947-5-1
The 3TH2 miniature contactor relays are suitable for use in any
climate. The contactor relays with screw terminals are finger-
safe according to IEC 60529.
The terminal designations comply with EN 50011.
Connections
The 3TH20 miniature contactor relays with four auxiliary contacts
are available with SIGUT screw terminals, 6.3 mm x 0.8 mm flat
connectors, and solder pin connections.
The miniature contactor relays with 6.3 mm x 0.8 mm flat con-
nectors can be used in the plug-in base with solder pin connec-
tions for printed circuit boards. The miniature contactor relays
are coded, and the plug-in base is codable in order to ensure
non-interchangeability.
The 3TH22 miniature contactor relays with eight integrated
contacts are available with screw terminals. The terminal
designations comply with EN 50011.
Contact reliability
High contact stability at low voltages and currents, particularly
suitable for solid-state circuits with currents
1 mA at a voltage
of
17 V.
Latched 3TH27 miniature contactor relays
The contactor coil and the coil of the release solenoid are both
designed for uninterrupted duty.
RC elements, varistors, diodes or diode assemblies can be fitted
to both coils from the front for damping opening surges in the
coil.
The contactor relay can also be switched on and released
manually.
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Accessories
Auxiliary switch blocks
The miniature contactor relays with four contacts with screw
terminals can be expanded by up to four contacts by adding
mountable auxiliary switch blocks
(see page 5/31)
.
A cover (with unit labeling plate) must be removed from the front
of the miniature contactor relays for this purpose. The auxiliary
switch block is then easy to mount. The auxiliary switch blocks
can be removed again by unlocking them with a laterally
arranged slide.
The miniature contactor relays with screw terminals with four
contacts according to EN 50011 with the identification number
40E can be expanded with 80E, 71E, 62E, 53E or 44E auxiliary
switch blocks to a total of eight miniature contactor relays ac-
cording to EN 50011. The identification numbers 80E, 71E, 62E,
53E or 44E on the coded auxiliary switch blocks apply to the
complete contactors. They cannot be combined with miniature
contactor relays with identification number 31E and 33E.
All miniature contactor relays with screw terminals with four
contacts according to EN 50011, identification number 40E, 31E
or 22E, can be expanded with auxiliary switch blocks with iden-
tification number 40, 31, 22, 20, 11 or 02 to miniature contactor
relays with six or eight contacts according to EN 50005. The
identification numbers on the auxiliary switch blocks apply only
to the attached auxiliary switch blocks.
Surge suppression
RC elements, varistors, diodes or diode assemblies (combina-
tion of a diode and a Zener diode for short break times) can be
plugged onto all contactors and auxiliary switch blocks with
screw terminals from the front in order to dampen opening
surges in the coil
(see page 5/32)
.
The unit labeling plate must be removed for this purpose. It can
be snapped onto the attached surge suppressor.
Additional load module
The 3TX4490-1J additional load module
(see page 5/32)
can be
used by programmable logic controllers to increase permissible
residual current, and to limit residual voltage in semiconductor
outputs.
This module ensures the safe shut-down of 3TH2 contactor
relays and 3TF2 contactors with direct control via 230 V AC
semiconductor outputs. It is accommodated in the same enclo-
sure as the 3TX4490-3. surge suppressors and can be plugged
into the contactor.
© Siemens AG 2016