Are TeSys D series contactors available with 4NC (Normally Closed) contacts?

No, but we can offer a possible solution.

Our offer:

The Tesys D contactor family are available as 3NO, 4NO or 2NO+2NC. See catalogue / product selectors for available options.

Possible solution:

To simulate NC contacts, you can in some cases use a 4-pole contactor with 4 NO contacts and the appropriate mechanical latch block for the contactor part number:

• LAD6K10* for 3-pole contactors LC1D09 to LC1D38 and 4-pole contactors LC1DT20 to LC1DT40
• LAD6K10* for 3-pole contactors LC1D40A to LC1D65A and 4-pole contactors LC1DT60A to LC1DT80A
• LA6DK20* for 3-pole contactors LC1D80 to LC1D150 and 4-pole contactors LC1D80/LP1D80 to LC1D115

Replace * with a letter representing the coil voltage. Please refer to catalogue / product selectors for more information.

Whether or not this solution will work will depend on your application and wiring options. See below for details on operation.

Information: Operation of an LAD* Mechanical Latch Block

A pulse on the contactor coil (terminals A1 & A2) causes the contactor to close. The LAD* module mechanically latches and holds the contactor closed. A pulse on the LAD coil (terminals E1 & E2) opens the contactor: Note this means you need 2 control signals, one for the contactor coil and a separate one for the latch block coil.

The duration of the control signal for the mechanical latch block and the contactor should be:

• >= 100 ms for a AC coil contactors
• >= 250 ms for a DC coil contactors

Maximum impulse duration for the LAD6K10* and LA6DK20*  mechanical latch blocks: 10 seconds.

Released for: Schneider Electric UK