SIEMENS
4/71
Siemens IC 10 · 2017
Contactors for Special Applications
Contactors for Railway Applications
3TH4 contactor relays, 8-pole
4
■
Overview
Standards
IEC 60947-4-1, EN 60947-4-1
The contactor relays are finger-safe according to IEC 60529.
Terminal covers may have to be fitted onto the connecting bars,
depending on the configuration with other devices.
Ambient temperature
The permissible ambient temperature for operation of the
contactors (across the full coil operating range) is -50 to +70 °C.
Uninterrupted duty at temperatures < -25 °C and > +55 °C
reduces the mechanical endurance, the current carrying
capacity of the conducting paths and the switching frequency.
A clearance of 10 mm is required for side-by-side mounting at
ambient temperatures > 55 °C. There is no need to reduce the
technical specifications.
■
Application
For operation in installations which are subject both to consider-
able variations in the control voltage and to high ambient tem-
peratures, e.g. in railway applications.
Control and auxiliary circuits
The solenoid coils of the contactor relays have an extended coil
operating range from 0.7 to 1.25 x
U
s
and are fitted as standard
with varistors to provide protection against overvoltage.
The opening delay is consequently 2 to 5 ms longer than for
standard contactors.
■
Technical specifications
1)
Side-by-side mounting with 10 mm distance.
All details and technical specifications not mentioned here are
identical to those of the 3TH4 basic units;
see from page 5/17
onwards
.
More information
Technical specifications,
see
FAQs,
Manuals,
Contactor relays
Type
3TH42
General data
Permissible
ambient temperature
• During operation
°C
-50 ... +70
1)
• During storage
°C
-55 ... +80
Control
Solenoid coil
operating range
0.7 ... 1.25 x
U
s
Power consumption of the solenoid coils
(for cold coil and 1.0 x
U
s
)
W
5.2
For cold coil: Closing = Closed
Permissible residual current of the electronics
(with 0 signal)
• DC operation
10 mA x (24 V/
U
s
)
Operating times at 1.0 x
U
s
(Total break time = OFF-delay + Arcing time)
• Closing
ON-delay (NO)
ms
45 ... 80
OFF-delay (NC)
ms
30 ... 34
• Opening
OFF-delay (NO)
ms
20 ... 30
ON-delay (NC)
ms
22 ... 32
• Arcing time
ms
10
© Siemens AG 2016