Schneider Electric LA1KN04 TeSys K 4 NC Front Contact Block

LA1KN04: four normally closed contacts in one TeSys K block

The LA1KN04 is a Schneider Electric TeSys K auxiliary contact block with four normally closed contacts in one front-mount housing. It gives a safety-minded panel several series permissive contacts from a single accessory. Seven Star LLC supplies the LA1KN04 in Oman and the GCC as an independent supplier based in Muscat.

The 04 in the reference is the contact count: no NO and four NC. The block is still 30 mm by 38 mm by 35 mm per the datasheet, the same envelope as the two-contact and mixed versions, which is what makes it a space-saver.

Technical specifications of the LA1KN04

When four NC contacts on the LA1KN04 are the right answer

A four-NC block is a good fit where one contactor must supply several independent permissive contacts, for example in an interlock chain that crosses a main circuit, a signal circuit and two alarm circuits. It avoids stacking two blocks and gives a cleaner terminal layout.

Remember that all four contacts open together when the contactor closes. If any circuit needs a closing contact at the same moment, a mixed block such as the LA1KN13 is the better pick.

Checklist for the LA1KN04

• Four NC, no NO contact in the block.
• Check the contactor model against LC1K, CA2K and CA3K.
• Confirm the control voltages in each circuit are within 690 V AC.
• Keep the circuits’ total heat in mind in a closed cabinet.
• Use the LA1KN40 if four NO contacts are needed instead.

LA1KN04 compatibility and electrical limits

The datasheet range compatibility is TeSys K LC1K and the relays CA2K and CA3K. The block mounts on the front face.

Ratings are listed once for the whole four-pole block: 690 V AC, 10 A thermal at 50 °C, 10 A gG fuse protection. All four circuits therefore share the same limits and the same housing.

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.

LA1KN04 uses in Oman and the GCC

Interlocked gate and shutter drives, small pump control panels and hoist controls make use of multiple NC contacts. In plants with strict permissive logic, such as fuel handling or chemical dosing skids, a four-NC block can feed several permissive loops from one contactor.

Panels in the Gulf run hot, so use the ambient limit from the datasheet as a hard design number.

LA1KN contact block family compared with the LA1KN04

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

Wiring practice for the LA1KN04

Eight screw clamp terminals demand tidy cabling. Use ferrules on 0.34 to 1.5 mm² flexible wire, tighten to 1.3 N.m and tug-test each lead.

A numbering plan per contact avoids mistakes. Test each of the four circuits individually, both with the contactor open and closed.

Information to send with an RFQ for the LA1KN04

• 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 LA1KN04 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.