Reliability and safety are pre-requisites in the choice of the control contactor. Siemens 3TH30 contactor relays satisfy these criteria and thus offer the right choice to the customer.

Applications
3TH30 are used in control circuits for switching and signaling purpose. Also they are used for interfacing with the electronic circuits.

Benefits and features
Flexibility
• 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.
Long Life
Superior design of current carrying parts, contact system and the magnet system increases the reliability which also results into higher electrical and mechanical endurance.
High reliability
• 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.

User friendliness and safety
• Positively driven contacts: 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.
• 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 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.