1. The location of the Siemens AC contactor model number

At the top of the trademark, as shown in the red mark in the picture below

2. The meaning of the Siemens AC contactor model number

1. Overview of Siemens contactor 3TF45:

Mainly used for AC 50Hz (or 60Hz), rated insulation voltage is 690V, and rated voltage is 380V under AC-3 use category In circuits with a rated operating current of up to 95A, it can be used to make and break circuits over long distances, and can be combined with appropriate thermal overload relays to form an electromagnetic starter to protect circuits that may be overloaded. Position: Insert position] Low power consumption and long life , safe, reliable, energy-saving, high-quality silver contacts, high resistance to welding and electrical wear resistance. It is composed of an electromagnetic system, a contact system, an arc extinguishing system and other parts. The electromagnetic system includes an electromagnetic coil and an iron core, which is an important part of the contactor. A component that drives the contacts to close and open. It is the execution part of the contactor, including main contacts and auxiliary contacts. The function of the main contact is to connect and disconnect the main circuit and control larger currents, while the auxiliary contact is in the control loop to meet the requirements of various control methods. The arc extinguishing device is used to ensure that the contacts disconnect the circuit. , the generated arc is reliably extinguished and the arc damage to the contacts is reduced. In order to quickly extinguish the arc during disconnection, the contactor is usually equipped with an arc extinguishing device. Generally, a semi-enclosed longitudinal seam clay arc extinguishing cover is used, and is equipped with a strong magnetic arc blowing circuit, including an insulating shell, a spring, a short-circuit ring, and a transmission. Institutions etc.

2. Contact system of Siemens contactor 3TF45:

The main and auxiliary contact materials are composed of silver alloy with superior electrical properties, which have long service life and good contact reliability. . The arc extinguishing chamber is closed and has flame-retardant materials to block the arc from splashing outward. le ≤ 22A - no arc extinguishing and arc separation plate; le ≥ 32A - equipped with metal arc separation plate to ensure the safety of people and nearby electrical appliances. The wiring screws adopt new self-lifting screws, and the tile-shaped pads and screws are not separated, which saves wiring time.

Reference materials

Baidu Library. Baidu Library [Citation time 2018-1-20]