Schneider Electric LADN11 TeSys D 1 NO + 1 NC Contact Block

LADN11: the standard 1 NO + 1 NC front block for LC1D contactors

The LADN11 is the standard Schneider Electric TeSys D front auxiliary contact block with one normally open and one normally closed contact and screw terminals. It is the accessory most often added to a TeSys D contactor to give a self-hold and a status or interlock contact. Seven Star LLC supplies the LADN11 in Oman and the GCC as an independent supplier based in Muscat.

The 11 in the reference stands for one NO and one NC. The block is the slim version: 26 mm wide, 48 mm high and 42 deep according to the datasheet, which leaves room beside it for a second block on a wide contactor. The wide four-contact versions in the same family are the LADN22, LADN31 and LADN40.

Technical specifications of the LADN11

What a 1 NO + 1 NC block gives the LADN11 user

A single NO contact held across the start button seals the contactor in, which is the foundation of two-wire and three-wire control. The NC contact then adds either an interlock against a reverse contactor or a status loop. Together they cover most small motor starters without further wiring.

The datasheet lists a non-overlap time of 1.5 ms between the NC and NO contacts, so they do not conduct together at switching, which matters for reversing interlocks.

Compatibility and ratings of the LADN11

The range compatibility line in the datasheet is TeSys D CAD and LC1D, TeSys F LC1F and CR1F, and the TeSys Deca CAD and LC1D. The block mounts on the front face.

Rated operational voltage is 690 V AC at 25 to 400 Hz, with conventional thermal current of 10 A at 60 °C. Rated operational current is 6 A at 120 V AC-15, 1.04 A at 690 V AC-15, 0.55 A at 125 V DC-13 and 0.1 A at 600 V DC-13. Making capacity is 140 A AC and 250 A DC, protection is a 10 A gG fuse, mechanical durability is 30 Mcycles, and the minimum switching level is 5 mA at 17 V. The non-overlap time between the NC and NO contacts is 1.5 ms on energisation and on de-energisation.

Choosing the LADN11 against other TeSys D blocks

• 1 NO + 1 NC, screw terminals, 26 mm wide.
• Mount on LC1D or CAD, or on LC1F, CR1F per the datasheet.
• If you need the EN 50012 marked version, look at the LADN11G.
• If you need more contacts in one block, see the LADN22.
• Check the logic level: below 17 V or 5 mA reliability falls.

LADN family: the LADN11 compared with its siblings

All six references below are front-mounting TeSys D blocks with screw clamp terminals; they differ in contact pattern and width.

Installing the LADN11 and testing it

Snap the block on the front of the contactor and tighten the terminals at 1.7 N.m with a flat 6 mm or a Philips or Pozidriv No 2 screwdriver. Terminals accept 1 to 4 mm² flexible conductor with ferrule.

Operate the contactor by hand and check with a meter that the NO closes and the NC opens, then re-torque after a heat cycle. Good terminal discipline here prevents the most common control-circuit faults.

LADN11 in Oman and the GCC

TeSys D contactors run pumps, compressors, fans and conveyors across industry in the Gulf, and the LADN11 is the commodity auxiliary block on them. It is held as a spare by maintenance teams, because the block is small and the downtime caused by a missing contact can be long.

The ambient limit of -5 to 60 °C should be checked for outdoor panels in summer.

Information to send with an RFQ for the LADN11

• Full reference and quantity required
• Contactor model the block mounts on
• Contact arrangement needed (NO and NC count)
• Control voltage and load of each circuit
• Delivery location and timing

Documents and quotation

A datasheet for the LADN11 is attached on this page. It carries the electrical, mechanical and environmental data summarised above, so the figures can be checked against your drawings.

Send the part number, quantity and application and we will confirm availability and a quotation. Seven Star LLC is an independent supplier in Muscat and is not affiliated with the manufacturer.