Siemens AC-3 Ficha Técnica descarregar pdf (Página 8)

High performance

• No duration upto 55°C

Contactors are suitable for operation in service temperature

upto 55°C without derating. This avoids selection of higher

rated contactor, thereby reducing cost.

• Long Life

Superior design of current carrying parts, contact system and

the magnet system increases the reliability results into higher

electrical and mechanical endurance.

• High short-time rating

Contactors have a high short-time rating, which makes them

suitable for applications having high starting currents and long

run-up times.

High reliability

• High insulation voltage and impulse withstand voltage capacity

ensures reliable performance during occasional abnormal

increase in supply voltage.

• Double break parallel bridge contact mechanism

This mechanism is available for auxiliary contacts. Such contact

mechanism ensures reliable contact at low voltage and low

currents (5mA at 17VDC). It also offers unmatched reliability.

(Chances of 2 mal-operations in 100 mill. operations as against

4460 for single bridge contacts)

Double Break Parallel Bridge

Auxilary Contacts

• Positively driven contacts

3TF contactors satisfy the conditions for positively driven

operation between the main power contacts and the NC

contacts. NC contacts positively open before the main contact

closes. This is extremely important when power contactors are

used in safety circuits of critical applications.

• SIGUT Termination

– Figure touch proof terminals*

It protects against accidental contact with live parts which

ensures operator safety.

– Funnel shaped cable entries

Reduce wiring time by facilitating quick location of the

connecting wire.

– Cable end-stop

It decides the insertion depth of the connecting wires. Since

the insertion depth is predetermined, insulation of the cable

can be cut accordingly and the possibility of insulation

getting inadvertently caught under the terminal, is avoided.

– Captive Screws

This feature prevents the screws from falling down thereby

facilitates the wiring. Hence, the contactors are delivered

with untightened terminals. This eliminates the operation of

untightening terminals before wiring.

– Lug less termination

This feature helps in reducing the termination time.

* Finger touch proof terminals are available upto 85 A

User friendliness and safety

• Arc Chamber Interlock (45A and above)

It prevents the contactor from switching ON, if the arc chamber

is not fitted properly. Thus avoids accidents to plant and

personnel.

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