Schneider Electric LA1KN02 TeSys K 2 NC Front Contact Block

LA1KN02: two normally closed contacts on the front of a TeSys K contactor

The LA1KN02 is a Schneider Electric TeSys K auxiliary contact block with two normally closed contacts, mounted on the front of the contactor and wired by screw clamp terminals. It is the simplest way to add an interlock or a feedback path to a small contactor. Seven Star LLC supplies the LA1KN02 in Oman and the GCC as an independent supplier based in Muscat.

In the reference, LA1K belongs to the TeSys K auxiliary block series, and the closing digits 02 read as zero normally open and two normally closed contacts. The sibling references use the same rule: 04 is four NC, 13 is one NO plus three NC, 20 is two NO and 40 is four NO.

Technical specifications of the LA1KN02

What the LA1KN02 attaches to

The datasheet range compatibility lists TeSys K contactors LC1K and the relay series CA2K, CA3K and CA4K. Notice that this two-contact block adds CA4K to the list, which the four-contact blocks do not show.

Mounting is on the front face, so the block sits above the coil terminals and below the power terminals depending on the contactor, and it can be removed without taking the contactor off the rail.

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 two NC contacts of the LA1KN02 for interlocking

Two normally closed contacts are the building blocks of electrical interlocking. Wired in the coil circuit of a second contactor they ensure that the second cannot be energised while the first is closed, which is the classic reversing and changeover interlock. Because the contacts are normally closed they also form a series chain of permissives or an emergency-stop feedback.

The datasheet gives a non-overlap distance of 0.5 mm between NC and NO contacts, which is a design feature in blocks with mixed contacts. For a pure NC block like this one, the figure matters when the block is stacked with an NO unit on the same contactor.

LA1KN02 specification checklist

• Two NC contacts, no NO.
• Switching of control signals: 690 V AC at 25 to 400 Hz, 10 A thermal.
• Minimum load 5 mA at 17 V for dry-circuit reliability.
• Protect with a 10 A gG fuse as in the datasheet.
• Compatible with LC1K, CA2K, CA3K and CA4K.
• If a signal lamp is needed too, add an NO block such as LA1KN20.

LA1KN contact block family compared with the LA1KN02

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

Fitting and wiring the LA1KN02

Clip the block into the front seat, tighten the screw clamp terminals at 1.3 N.m using a Philips No 2 or Pozidriv No 2 screwdriver and use conductors of 0.34 to 1.5 mm² with ferrules or 0.75 to 4 mm² without. Two cables per terminal are allowed within the ranges of the datasheet.

Mark the terminals with the numbers used in the drawing. For interlocks, test the function by closing each contactor by hand and measuring that the other coil circuit opens.

LA1KN02 in Oman and the GCC

Small contactors of the TeSys K range appear in compact starters, heating control and HVAC panels. NC contacts are used for interlocking between the forward and reverse contactors of gate or shutter motors, and as feedback to PLC inputs.

The ambient range of -25 to 50 °C in the datasheet is narrower than for some TeSys D accessories, so mount the block where the cabinet air does not exceed 50 °C in the summer.

Information to send with an RFQ for the LA1KN02

• 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 LA1KN02 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.