Siemens - Contactor Relay
Used in control circuits for switching and signaling purposes as well as used for interfacing with the electronic circuits.
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3TH30 are used in control circuits for switching and signaling purpose. Also they are used for interfacing with the electronic circuits.
Contactor relay conforms to IS /IEC 60947-5-1. They also carry CE mark.
Air break contactor relays are suitable for 10A, (AC15/AC14 rating) at 240V AC and 10A, (DC13 rating) at 24V DC.
- Choice of auxiliary contacts: 3TH30 contactor relays comes with 4 contacts as a basic unit (4NO, 3NO+1NC, 2NO+2NC). However the contacts can be extended upto 8 contacts by adding maximum 4 auxiliary contact blocks to this basic unit. This offers flexibly in selection and configuration.
- Choice of mounting: 3TH30 can be mounted on 35mm DIN rail and they are also suitable for screw mounting.
Superior design of current carrying parts, contact system and the magnet system increases the reliability which also results into higher electrical and mechanical endurance.
Double Break Parallel Bridge contact mechanism: This mechanism is available with 3TH30. Such contact mechanism ensures reliable contact at low voltage and low currents (5mA at 17V DC). It also offers unmatched reliability as well as capability to integrate directly into PLC or instrumentation circuits
3TH30 auxiliary contactors satisfy the conditions for positively driven operation between NO and NC contacts. NO and NC contact do not close at the same time. This is extremely important when they are used in safety circuits of critical applications. This ensures operator safety even during abnormal condition.
- 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 auxiliary 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.
3TF power contactors are suitable for switching and controlling squirrel cage and slip-ring motors as well as other AC loads, such as solenoids, capacitors, lighting loads, heating loads and transformer loads.
Contactors conform to IS/IEC 60947-4-1. They also carry the CE mark
Contactors and bi-relays have been tested for type-2 coordination at Iq = 50kA, 415V AC, 50Hz as per IS/IEC 60947-4-1, for both fuse protected as well as fuseless motor feeders.
Air break contactors are available from 9 A to 475A in 3 pole version. Also available in 2 pole AC version from 45A to 400A.
Choice of Auxiliary contacts
| Contactor | Aux.contacts on basic unit | Permissible add-on contact blocks |
|---|---|---|
| 9A / 12A | 1 NO | Upto 4NO or 4NC |
| 9A / 12A | 1 NC | Upto 4NO or 4NC |
| 16A/22A | – | Upto 4NO or 4NC |
| 32A/38A | – | Upto 4NO or 4NC |
| 45A to 475A | 2NO+2NC | 2 x (1NO+1NC) |
Contactor can be mounted on 35mm DIN and they are also suitable for screw mounting (9-38A – DIN / Screw mounting and 45-475A – Screw mounting).
AC 50Hz coil code: 3TF30 to 3TF56
| Coil voltage (V) | 24 | 42 | 110 | 230 | 415 |
| Code | B0 | D0 | F0 | P0 | R0 |
AC 50/60 Hz coil code: 3TF57
| Coil voltage (V) | 110-132 | 220-240 | 380-460 |
| Code | F7 | M7 | Q7 |
Wide band AC 50 Hz coil code: 3TF30 to 3TF35
| Coil voltage (V) | 70-140 | 150-280 | 260-460 |
| Code | W110 | W220 | W415 |
DC coil code: 3TF30 to 3TF57
| Coil voltage (V) | 24 | 42 | 48 | 110 | 220 | 250+ |
| Code | B4 | D4 | W4 | F4 | M4 | N4 |
- 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 insulation voltage and impulse withstand voltage capacity ensures reliable performance during occasional abnormal increase in supply voltage
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)
- 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.
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.
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.
