Standards

IEC/EN 60947‑1, IEC/EN 60947‑4‑1

The 3TK20 miniature contactors are suitable for use in any climate. The miniature contactors with screw terminals are finger-safe according to IEC 60529.

Connection method

The miniature contactors are available in versions with screw terminals, 6.3 mm plug-in terminals and solder pin connections for soldering to printed circuit boards.

The 3TK2 miniature contactors with 6.3 mm x 0.8 mm flat connectors are coded and can be used in the plug-in base with solder pin connections for printed circuit boards (see Accessories and spare parts" в†’ "for 3TF, 3TK, 3TC Contactors and 3TH Contactor Relays and Miniature Contactor Relays").

Ratings of three-phase motors

The quoted rating (in kW) refers to the output power on the motor shaft (according to the nameplate).

The power rating specifications of the contactors in kW are guide values for 4-pole standard motors at 50 Hz and specified voltage (e.g. 400 V AC). The actual starting and rated data of the motor to be switched must be considered when selecting the units.

Auxiliary contacts

Contact reliability

To switch voltages ≤ 110 V and currents ≤ 100 mA, 3TH2 miniature contactor relays should be used as they provide a high level of contact reliability.

These auxiliary contacts are suitable for solid-state circuits with currents ≥ 1 mA at a voltage of 17 V and higher.

Short-circuit protection of the miniature contactors

Short-circuit protection of the miniature contactors without overload relay see technical specifications.

AC and DC operation

• AC-1: Operational current I_e = 16 A (at 55 °C)
• AC-2 and AC-3: Operational current I_e = 9 A (at 400 V)