Datasheet

ManualsBrandsSiemens ManualsAutomationPower Contactor 3NO 24V 7A 3kW

Power Contactors for Switching Motors

3/11

Siemens IC 10 AO · 2013

SIRIUS 3RT10 contactors,

3-pole, 3 ... 250 kW

■

Overview

Standards

IEC 60947-1, EN 60947-1,

IEC 60947-4-1, EN 60947-4-1,

IEC 60947-5-1, EN 60947-5-1 (auxiliary switches)

The 3RT1 contactors are climate-proof. They are finger-safe

according to EN 50274.

Connection methods

The 3RT1 contactors are available with screw terminals (box ter-

minals) or spring-type terminals.

The size S3 contactors have removable box terminals for the

main conductor connections. This permits connection of ring

terminal lugs or busbars.

Contact reliability

If voltages ≤ 110 V and currents ≤ 100 mA are to be switched,

the auxiliary contacts of the 3RT1 contactor or 3RH11 contactor

relay should be used as they guarantee a high level of contact

reliability.

These auxiliary contacts are particularly suitable for solid-state

circuits with currents ≥ 1 mA at a voltage ≥ 17 V.

Short-circuit protection of the contactors

Short-circuit protection of the contactors without overload relay

see Technical Specifications. For short-circuit protection of the

contactors with overload relay, see Configuration Manual

"SIRIUS Configuration":

http://support.automation.siemens.com/WW/view/de/40625241

To assemble fuseless motor feeders you must select combina-

tions of motor starter protector and contactor as explained in

"Fuseless Load Feeders".

Motor protection

3RU11 thermal overload relays or 3RB20/3RB21 solid-state

overload relays can be fitted to the 3RT1 contactors for protec-

tion against overload. The overload relays must be ordered sep-

arately.

Ratings of induction motors

The quoted rating (in kW) refers to the output power on the motor

shaft (according to the nameplate).

Surge suppression

3RT1 contactors can be retrofitted with RC elements, varistors,

diodes or diode assemblies (assembly of diode and Zener diode

for short break times) for damping opening surges in the coil.

Note:

The OFF-delay of the NO contact and the ON-delay of the NC

contact are increased if the contactor coils are attenuated

against voltage peaks (noise suppression diode 6 to 10 times;

diode assembly 2 to 6 times, varistor +2 to 5 ms).

Sizes S00 to S3, up to 45 kW

Auxiliary contact complement

Size S00 contactors have an auxiliary contact integrated in the

basic unit. The basic units of sizes S0 to S3 are delivered only

with the main contacts and can be extended with auxiliary switch

blocks.

For sizes S0 to S3, there are also complete units with fitted aux-

iliary switch blocks 2 NO + 2 NC (terminal designation accord-

ing to EN 50012); the auxiliary switch block can be removed (for

further information see Accessories, page 3/28).

Note:

Auxiliary contact complement according to SUVA: Contactors

with permanently mounted auxiliary switch block 2 NO + 2 NC

are available for safety applications according to SUVA.

Surge suppression

The surge suppressors are plugged onto the front of size S00

contactors. Space is provided for them next to a snap-on auxil-

iary switch block.

For size S0 to S3 contactors, varistors and RC elements can be

snapped on either on the top or directly below the coil terminals.

Diode assemblies are available in 2 different versions on ac-

count of their polarity. Depending on the application they can be

connected either only at the bottom (assembly with motor starter

protector) or only at the top (assembly with overload relay).

The plug-in direction of the diodes and diode assemblies is

specified by coding.

Exceptions:

3RT19 26-1T.00 and 3RT19 36-1T.00,

in this case the plug-in direction is marked with "+" and "-".

Coupling contactors are supplied either without overvoltage

damping or with a varistor or diode connected as standard, ac-

cording to the version.

Sizes S6 to S12, > 45 to 250 kW

• 3RT10, contactors for switching motors

• 3RT12 vacuum contactors for switching motors

• 3RT14, contactors for AC-1 applications (see Chapter 4)

Operating mechanism types

Two types of solenoid operation are available:

• Conventional operating mechanisms

• Solid-state operating mechanism (with 2 performance levels)

Control supply voltage

The contactors have a UC operating mechanism which can be

operated with AC (50 to 60 Hz) as well as with DC.

Withdrawable coils

For simple coil replacement, e.g. if the application is replaced,

the solenoid coil can be pulled out upwards after the release

mechanism has been actuated and can be replaced by any

other coil of the same size.

Auxiliary contact complement

Contactor sizes S6 to S12 are supplied with mounted auxiliary

switch blocks.

Detailed information about the fitting of auxiliary switches see

"Accessories", page 3/28.

• 3RT10 and 3RT14 contactors:

Auxiliary contacts mounted laterally and on front

• 3RT12 vacuum contactors:

Auxiliary contacts mounted laterally

Contactors with conventional operating mechanism

Version 3RT1. . .-.A:

The solenoid coil is switched directly on and off with the control

supply voltage U

by way of terminals A1/A2.

Multi-voltage range for the control supply voltage

Only one coil covers several close-lying control supply voltages

which are used worldwide,

e.g. 110–115–120–127 V AC/DC or 220–230–240 V AC/DC. Al-

lowance is made in addition for am operating range of 0.8 times

the lower (U

s min

) and 1.1 times the upper (U

s max

) rated control

supply voltage within which the contactor switches reliably and

no thermal overload occurs.