Datasheet

ManualsBrandsSiemens ManualsAutomationPower Contactor 3NO 24V 7A 3kW

Power Contactors for Switching Motors

SIRIUS 3RT10 contactors,

3-pole, 3 ... 250 kW

3/12

Siemens IC 10 AO · 2013

Contactors with solid-state operating mechanism

The solenoid coil is supplied selectively with the power required

for reliable switching and holding by upstream control electron-

ics.

• Wide voltage range for the control supply voltage U

Compared with the conventional operating mechanism, the

solid-state operating mechanism covers an even broader

range of control supply voltages used worldwide within one

coil variant. For example, the coil for 200 to 277 V AC/DC (U

min

to U

s max

) covers the voltages 200-208-220-230-240-254-

277 V used worldwide.

• Extended operating range 0.7 to 1.25 x U

The wide range for the rated control supply voltage and the

additionally allowed coil operating range of 0.8 x U

s min

to 1.1

x U

s max

results in an extended coil operating range of at least

0.7 to 1.25 x U

, within which the contactors will operate reli-

ably, for the most common control supply voltages of 24, 110

and 230 V.

• Bridging temporary voltage dips:

Control voltage failures dipping to 0 V (at A1/A2) are bridged

for up to approx. 25 ms to avoid unintentional tripping.

• Defined ON and OFF thresholds:

For voltages above 0.8 x U

s min

the electronics will reliably

switch the contactor ON, and for voltages below the value 0.5

x U

s min

it is reliably switched OFF. The hysteresis in the switch-

ing thresholds prevents the main contacts from chattering as

well as increased wear or welding when operated in weak, un-

stable networks. This also prevents thermal overloading of the

contactor coil if the voltage applied is too low (contactor does

not close properly and is continuously operated with overexci-

tation).

• Low control power consumption when closing and in the

closed state.

Electromagnetic compatibility (EMC)

The contactors with solid-state operating mechanism conform to

the requirements for operation in industrial plants:

• Interference immunity

- Burst (IEC 61000-4-4): 4 kV

- Surge (IEC 61000-4-5): 4 kV

- Electrostatic discharge, ESD (IEC 61000-4-2): 8/15 kV

- Electromagnetic field (IEC 61000-4-3): 10 V/m

• Emitted interference

- Limit value class A according to EN 55011

Note:

In connection with converters, the control cables must be routed

separately from the load cables to the converter.

Indication of remaining lifetime (RLT) remaining life time)

Main contactor contacts are working parts which therefore must

be replaced in good time when the end of their service life has

been reached. The degree of contact erosion and thus the elec-

trical endurance (= number of operating cycles) depends on the

loading, utilization category, operating mode, etc. Up to now,

routine checks/visual inspections by the maintenance personnel

were needed in order to gain an insight into the state of the main

contacts.

The remaining lifetime indication function now takes over this

task. It does not count the number of operating cycles – which

does not provide information about contact erosion – but instead

electronically identifies, evaluates and stores the actual prog-

ress of erosion of each one of the three main contacts, and out-

puts a warning when specified limits are reached. The stored

data are not lost even if the control supply voltage for A1/A2 fails.

After replacement of the main contacts, measurement the re-

maining lifetime must be reset using the "RESET" button (hold

down RESET button for about 2 seconds using a pen or similar

tool).

Advantages:

• Additional visual display of various levels of erosion by means

of LEDs on the laterally mounted solid-state module when re-

maining lifetime is 60 % (green), 40 % (orange) and 20 %

(red).

• Early warning to replace contacts

• Optimum utilization of contact material

• Visual inspection of the condition of contacts no longer neces-

sary

• Reduction of ongoing operating costs

• Optimum planning of maintenance measures

• Avoidance of unforeseen plant downtimes

Version 3RT1. . .-.N: for 24 V DC PLC output

2 control options:

7 Control without a coupling link directly through a 24 V DC/≥ 30

mA PLC output (IEC 61131-2). Connection by means of 2-pole

plug-in connection. The screwless spring-type connection is

part of the scope of supply. The control supply voltage which

supplies the solenoid operating mechanism must be con-

nected to A1/A2.

Note:

Before start-up, the slide switch for PLC operation must be

moved to the "PLC ON" position (setting ex works: "PLC OFF").

7 Conventional control by applying the control supply voltage at

A1/A2 through a switching contact.

Note:

The slide switch must be in the "PLC OFF" position

(= setting ex works).

RLT

Reset

60 %

40 %

20 %

60 %

RLT

Reset

60 %

40 %

20 %

40 %

RLT

Reset

60 %

40 %

20 %

RLT

Reset

60 %

40 %

20 %

NSB0_01150a

LED-

Displays

green

red

orange

new

24 V DC

24 V DC/30 mA

PLC output

Plug-in connection, 2-pole

Shutdown in an emergency

(EMERGENCY-STOP) – optional

Slide switch, must be in

position PLC "ON"

ONOFF

PLC

A2A1

L1/L+

NSB0_01143e

N/L-

24 V DC

Slide switch, must be in

position PLC "OFF"

Shutdown in an emergency

(EMERGENCY-STOP) – optional

NSB0_01144e

ONOFF

PLC

A2A1

N/L-

L1/L+