Schneider Electric LA1KN13 TeSys K 1 NO + 3 NC Contact Block

LA1KN13: one NO and three NC contacts for mixed control duties

The LA1KN13 is a Schneider Electric TeSys K front-mount auxiliary block with one normally open and three normally closed contacts. The mix suits a contactor that must both signal that it is closed and provide several interlock or safety paths. Seven Star LLC supplies the LA1KN13 in Oman and the GCC as an independent supplier based in Muscat.

The reference decodes as one NO (the 1) and three NC (the 3). It is the only mixed-pattern block in this list of TeSys K references, and its compatibility is listed as LC1K, CA2K and CA3K.

Technical specifications of the LA1KN13

LA1KN13 ordering points

• Contact mix: one NO, three NC.
• Check the application: self-hold plus interlocks, or status plus permissives.
• Compatible families: LC1K, CA2K, CA3K.
• Terminals: screw clamp, 0.34 to 1.5 mm² with ferrule.
• Compare with LA1KN02 and LA1KN20 if only two contacts are needed.

Where the LA1KN13 fits

It clips to the front of TeSys K contactors LC1K and to CA2K and CA3K control relays. The datasheet mentions a non-overlap distance of 0.5 mm, important for a block that combines NO and NC contacts, because it means the NC and NO contacts of the block are never closed at the same time.

Electrically it is rated for 690 V AC and 10 A thermal with a 10 A gG fuse, and the minimum switching level is 5 mA at 17 V.

The datasheet describes a front-mounting block with screw clamp terminals, 30 mm high, 38 mm wide and 35 mm deep, weighing 0.045 kg. Rated operational voltage is 690 V AC at 25 to 400 Hz, conventional thermal current is 10 A at 50 °C, and the associated fuse is 10 A gG up to 690 V. Rated making capacity is 110 A, with short-time ratings of 80 A for 1 s, 60 A for 500 ms and 110 A for 100 ms. Minimum switching is 5 mA at 17 V, and the non-overlap distance between NC and NO contacts is 0.5 mm.

Using the 1 NO + 3 NC pattern of the LA1KN13

The single NO contact typically feeds a run lamp, a PLC feedback input or a self-holding branch. The three NC contacts serve interlocks, so one block both reports and prevents.

In practice this pattern is used on the first contactor of a reversing pair, where the NO gives the self-hold and the NC contacts block the opposite direction and an additional lockout. It also suits a contactor supervising a door or guard circuit.

Installing the LA1KN13 and checking the contacts

After seating the block, measure each contact with the contactor open and closed. The NO should read open and the three NC closed at rest, and the pattern reverses when the contactor closes.

Lock the terminals at 1.3 N.m, record the terminal numbering on the schematic and re-torque after the first thermal cycle in hot cabinets.

LA1KN contact block family compared with the LA1KN13

The five TeSys K references below differ only in the arrangement of contacts. The highlighted row is the page you are reading.

LA1KN13 in Oman and GCC panels

Compact motor starters for fans, pumps and shutters, small compressor panels and building services use contactors from the TeSys K family. A block with one NO and three NC adds status and interlock in one accessory.

Where panels live in dusty or humid locations, specify closed enclosures, since the block itself is rated IP20 and rated for a normal environment.

Information to send with an RFQ for the LA1KN13

• Full reference and quantity required
• Contactor or relay 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 LA1KN13 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.