Instruction manual of 3TF44, 3TF45 AC contactor, introducing installation, wiring, operation, maintenance and maintenance
This manual covers safety warnings and general information for the Siemens 3TF44 and 3TF45 AC contactors. Hazardous voltage can cause electric shock or burns, so power must be disconnected and work performed only by qualified personnel.
The document details installation on a 35 mm DIN rail, wiring dimensions, permissible conductor sizes, operation indicators, maintenance procedures such as replacing contacts, arc chute, and magnet coil, as well as full technical specifications for both AC and DC operation.
| Weight (AC operation) | ≈ 760 g |
|---|---|
| Weight (DC operation) | ≈ 1 430 g |
| Operating ambient temperature | -25 °C to +55 °C |
| Storage temperature | -50 °C to +80 °C |
| Rated insulation voltage | Ui AC 690 V |
| Rated operating current (55 °C) | 55 A |
Disconnect the power and ensure only qualified personnel perform any work, as hazardous voltage can cause electric shock or burns.
Refer to Fig. VII, ensure the coil faces are clean, and do not use grease or sharp objects during cleaning.
Yes, it can snap onto a 35 mm standard mounting rail or be fixed with two M4 screws using washers.
Solid conductors 1–16 mm², finely stranded without end sleeve 2.5–16 mm², and AWG wires 14–3 mm² are allowed, with specific maximum values for each type.