User Guide
Table Of Contents
- 3 3RT1 contactors/ 3RH1 control relays
- 3.1 Specifications/regulations/approvals
- 3.2 Device description
- 3.3 Application and areas of use
- 3.3.1 3RT10 contactors with 3 main contacts for switching motors
- 3.3.2 3RT14 contactors with 3 main contacts for switching resistive loads (AC-1)
- 3.3.3 3RT12 Vacuum contactors
- 3.3.4 3RT13 and 3RT15 contactors with 4 main contacts
- 3.3.5 3RT16 capacitor contactors
- 3.3.6 Contactors with an extended operating range
- 3.3.7 3RH1 control relays
- 3.3.8 3RT10 contactor relays for switching motors (interface) and 3RH11 control relays for switching auxiliary circuits
- 3.3.9 3RA13 Contactor combinations for reversing
- 3.3.10 3RT14 Wye-delta combinations
3RT1 contactors/ 3RH1 control relays
SIRIUS System Manual
3-26 GWA 4NEB 430 0999-02 DS 01
3.2.4 Operation
3.2.4.1 General information
Degree of protection The degree of protection of the SIRIUS contactors is IP00/IP20.
Warning
When the supply voltage and load are present, the contactor must not be
actuated by pressing the contact support. It is permissible, however, to
carry out tests with an extra-low test voltage (e.g. ≤ 24 V).
Mechanical life A significant criteria for the economical use of contactors is their mechanical
endurance. This is expressed in the number of operations that are possible
without placing a load on the conducting path. You cannot expect too much
in terms of mechanical endurance from switches that have to work with a
relatively high contact load, such as isolators and circuit breakers, without
neglecting their cost-efficiency. Contactors, on the other hand, are switching
devices designed specifically for very high numbers of on/off operations.
The following table shows you the mechanical endurance of 3RT1 contac-
tors:
When there is no arcing during switching the mechanical endurance can be
optimized if low current is used (for example, 17 V 5 mA).
Display of the contactor
function
The 3RT1926 LED indicator block can be connected to the coil connections
of the contactors in frame sizes S00 to S3. It indicates the status of the con-
tactors by means of the yellow LED. The indicator block can be snapped
onto the front in the opening intended for the inscription plate.
The advantage is that the LED indicator block can be used for AC/DC volt-
ages of 24 V to 240 V and that it is protected against polarity reversal.
Device Mechanical endurance
Basic unit, frame size S00 30 mill. operating cycles
Basic unit, frame size S00 with built-
on auxiliary switch block
10 mill. operating cycles
Basic unit, frame sizes S0 to S12 10 mill. operating cycles
Basic units, frame sizes S00 to S3
with built-on, electronically optimized
auxiliary switch block
5 mill. operating cycles
Table 3-11: Mechanical service life