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
GWA 4NEB 430 0999-02 DS 01
3-7
Rated operational cur-
rents
The rated operational currents for the various utilization categories are listed
in the low-voltage switching devices catalog. The test specifications given in
the table for each utilization category represent the scale for the making and
breaking capacity of the auxiliary contacts.
Example 3RT1016 contactor:
I
e
/AC-15 of the auxiliary contact: 6 A/230 V
Making capacity: 10 x I
e
/AC-15 = 60 A
• This enables the contactor coil with the current consumption of 60 A to
be switched on.
• Only the holding current is decisive for switching off the contactor coil.
According to regulations, the auxiliary contact must normally be able to
switch off the rated operational current.
Utilization category for
DC voltage
(auxiliary contact ele-
ments)
Definition of DC-12 and
DC-13
The DC voltage switching capacity of auxiliary contacts is defined in utiliza-
tion categories DC-12 and DC-13.
The main areas of application for contactors are:
• DC-12: switching of resistive loads (typical application)
• DC-13: switching of inductive loads, such as contactor coils and solenoid
valves
In DC operation, the difference in stress is also determined by the L/R time
constant. This must be specified by the user.
Switching capacity
DC Utilization category for DC voltage
(auxiliary contact elements)
Make Break
I/I
e
I/I
e
L
/
R
(ms)
DC-12 Control of resistive load and semi-
conductor load in the input circuits
of optocouplers
111
DC-13 Control of solenoids 1 1 300
Table 3-4: Utilization categories, test conditions for DC voltage (auxiliary contact elements)