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BETA Switching
Switching Devices
5
TT5 8 Insta contactors, AC technology
8/25
Siemens ET B1 · 10/2008
8
*
You can order this quantity or a multiple thereof.
■
More information
Mounting position, Insta contactors, AC technology
The installation of the devices is permissible in the positions
shown in the following diagram (0° to 90°, 270° to 0°). There are
no restrictions when the devices are installed in these normal
mounting positions.
Heat dissipation
If several Insta contactors with AC magnetic system are
mounted in series in a distribution board, there are no restrictions
for the types 25 A, 40 A and 63 A within the permissible ambient
temperature range up to 55 °C. For 20 A types within the
temperature range up to 40 °C, a 5TG8 240 spacer must be
installed after every third Insta contactor, and in the temperature
range over 40 °C to 55 °C, after every second contactor.
Manual switching with O/I/Automatic function
The versions 5TT5 8. . .-6 and 5TT5 8. . .-8 are also fitted with a
manual switch. The knob allows preselection of 3 positions:
•
Knob in the "AUTO" position
Automatic mode normal protective function
•
Knob in the "I" position
Continuous operation switched on manually
(
without control signal, when a control signal is applied, the
manual switch on reset, i.e. the knob is automatically reset to
the "AUTO" position).
•
Knob in the "O" position
Off switched off
(
coil circuit interrupted)
Plant test without applying a control voltage
Insta contactors with O/I/Automatic function enable the testing of a
plant by manual switch without the need to apply a control voltage.
Automatic by control signal
When applying a control signal to the terminals A1 and A2, the
Insta contactors can be reset from continuous operation mode
("
I" position) to automatic mode ("AUTO" position).
I2_12836b
180
°
0
°
90
°
270
°
© Siemens AG 2008