For operation in installations which are subject both to considerable variations in the control voltage and to high ambient temperatures, e. g. railway applications under extreme climatic conditions, rolling mills, etc.

3RT10 contactors, sizes S00 and S0 with conventional coil

These contactor relays have an extended operating range from 0.7 to 1.25 x U_s; the coils are fitted with varistors as standard. An additional series resistor is not required. Please note:

• Size S00: it is not possible to mount an auxiliary switch block.
• Size S0: up to two single-pole auxiliary switch blocks can be mounted

Mounting

A clearance of 10 mm is required for side-by-side mounting at ambient temperatures > 60 °C ? 70 °C.

3RT10 contactors, sizes S0 to S3 with series resistor

The DC solenoid systems of the contactors are modified (to holding excitation) by means of a series resistor.

Auxiliary switches

The size S00 contactors are supplied prewired with a plug-on module containing the series resistor. The varistor is integrated. The integrated NC contact is used for switching the series resistor. A 4-pole auxiliary switch block (according to EN 50005) can be additionally fitted.

The size S0 to S3 contactors are equipped on the front with an auxiliary switch block with 2 NO + 2 NC contacts. The separate series resistor, which is attached laterally next to the contactor on the 35 mm standard mounting rail, is fitted with connecting cables for mounting onto contactors. A circuit diagram showing the terminals is stuck onto each contactor. Normally closed contacts 21-22 of the auxiliary contacts are required for the series resistor function. The selection and ordering data shows the number of additional, unassigned auxiliary contacts.

Circuit diagram with series resistor for size S00

Circuit diagram with series resistor for sizes S0 to S3

Mounting

At ambient temperatures up to 70°C, the size S00 contactors and contactor relays are allowed to be mounted side by side.

The resistor module of the size S0 to S3 contactors must be mounted to the left of the contactor owing to the prefabricated connecting cables.

Dimensions

Attaching the series resistor increases the width of contactor sizes S0 to S3.

3RT10 contactors, sizes S00 to S3 with electronic contactor control unit, extended operating range

They are supplied as complete units with a built-on contactor control unit.

Control and auxiliary circuits

The contactors are energized via upstream control electronics which ensure the coil operating range of 0.7 to 1.25 x U_s at an ambient temperature of 70 °C.

A varistor is integrated for damping opening surges in the coil. The opening delay is consequently 2 to 5 ms longer than for standard contactors.

The possibility of mounting auxiliary switches is the same as that for equivalent standard contactors.

Mounting

At ambient temperatures up to 70 °C, sizes S0 to S3 of these contactor versions are allowed to be mounted side by side.

Dimensions

Because of the built-on contactor control unit, the height of the size S0 to S3 contactors increases by up to 34 mm.