Schneider Electric LADN22 TeSys D 2 NO + 2 NC Contact Block

LADN22: four-contact block with two NO and two NC contacts

The LADN22 is a Schneider Electric TeSys D front auxiliary contact block with two normally open and two normally closed contacts. It is the balanced four-contact block, and the most common choice when a contactor needs both a self-hold and several interlock or signal circuits. Seven Star LLC supplies the LADN22 in Oman and the GCC as an independent supplier based in Muscat.

At 44 mm wide, 48 mm high and 42 mm deep, with a net weight of 0.05 kg, the block takes the full width of the front face of a small contactor.

Technical specifications of the LADN22

The 2 NO + 2 NC balance of the LADN22

Two NO contacts handle sealing and status; two NC contacts handle interlocks. That balance covers a reversing starter with a mechanical-plus-electrical interlock, or a star-delta contactor that needs to block other contactors in the sequence.

Compared with using two LADN11 blocks, a single LADN22 occupies one mounting position, which matters on contactors that accept only one front block.

Compatibility and electrical data of the LADN22

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.

Range compatibility in the datasheet: TeSys D CAD and LC1D, TeSys F LC1F and CR1F, TeSys Deca CAD and LC1D. Standards include EN/IEC 60947-5-1, UL 60947-5-1 and CSA C22.2 No 60947-5-1, and certifications listed are CB Scheme, UL, CSA, CCC, EAC and UKCA.

LADN family: the LADN22 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.

LADN22 specification checklist

• Four contacts: 2 NO + 2 NC.
• Width 44 mm; check the free space on the contactor front.
• Use LADN31 for 3 NO + 1 NC and LADN40 for 4 NO.
• Screw clamp terminals; two conductors per terminal within the datasheet range.
• Net weight 0.05 kg.

Terminal and torque details for the LADN22

Each of the eight terminals takes 1 to 4 mm² flexible with ferrule for single conductors, or 1 to 2.5 mm² for two. Tighten at 1.7 N.m.

Mark the NO and NC pairs on the schematic and test each pair under both contactor states. With eight terminals in a small block, a mistaken cross-wire is more likely than a failed contact.

LADN22 in Oman and GCC panels

The block is a favourite in star-delta and reversing starters on pumps and compressors at water, power and oil and gas sites, where the control scheme needs interlocks and several signals on the same contactor.

Spare LADN22 blocks are cheap insurance for shutdowns; a loose or burnt contact on a main contactor is a typical overhaul finding.

Information to send with an RFQ for the LADN22

• 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 LADN22 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.