Design

Design of the contacts

Each switch has three adjacent contact elements.

A 4th leading contact for switching the N conductor, a continuous PE terminal, an auxiliary switch (1 NO + 1 NC) can be fitted to each side of the switch. The auxiliary switches operate as leading contacts on opening. On opening, the NO contact opens before the main contacts, so that a contactor carries the switching power in the circuit and the maintenance or safety switch switches at zero current. On closing, the auxiliary switch switches later than or at the same time as the main contacts.

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Design of rotary operating mechanisms

The rotary operating mechanisms of the switches for front or floor mounting are mounted on control cabinet doors, or on front or side panels via center-hole mounting with a standard diameter of 22.5 mm and are operated from the outside. In their OFF position, they can be locked with 1 to 3 padlocks with a hasp thickness of 4 to 8 mm.

  • Switch position indicator: The switch position is clearly marked with direction arrows and an "O" for OFF and a "I" for ON at the front.

  • Switches for front mounting: The switches for front mounting are connected directly to the rotary operating mechanism through the fixing screws or – in the case of center-hole mounting – a special-purpose coupling.

  • Switches for floor mounting: The switches for floor mounting are snapped onto 35 mm standard mounting rails according to EN 60715 or screw-mounted on mounting plates. The actuators are connected to the lower section of the switch through a door coupling, which can be released in its zero position, and a 300 mm long switch shaft. When the control cabinet door is open, the switch can be protected against inadvertent operation by removing the switch shaft from the lower section of the switch. The overall depth can be adapted to individual requirements by adjusting the switch shaft length.

  • Switches for distribution board mounting: The switches for distribution board mounting are suited for operation in distribution boards and for switching inside control cabinets or distribution boards. They have cap and mounting dimensions to DIN 43880 and can be fitted under the same cover together with miniature circuit breakers. The selector switches can be locked in their OFF position with no more than one padlock with a hasp thickness of 4 to 6 mm.

3LD3054-0TK53 switch for front mounting with rotary operating mechanism

3LD3050-0TK11 switch for front mounting with knob

3LD3040-0TK13 switch for floor mounting with knob and door coupling

3LD3030-0TK11 switch for distribution board mounting with knob

3LD3048-0TK51 switch for floor mounting with rotary operating mechanism and door coupling