Schneider Electric LA1KN40 TeSys K 4 NO Front Contact Block

LA1KN40: four normally open contacts for signalling and sequence control

The LA1KN40 is a Schneider Electric TeSys K auxiliary contact block with four normally open contacts. All four close when the contactor operates, giving a single accessory that can feed several signals at once. Seven Star LLC supplies the LA1KN40 in Oman and the GCC as an independent supplier based in Muscat.

The reference follows the family logic: 40 means four NO and no NC. The housing is 30 mm by 38 mm by 35 mm and weighs 0.045 kg per the datasheet, so it does not grow with the number of contacts.

Technical specifications of the LA1KN40

Four NO contacts and what to do with them

A contactor often has to tell several systems that it is running: a lamp, a PLC input, a counter and a sequence circuit that starts the next unit. Four NO contacts give four isolated closing paths, so the circuits do not share a potential.

Isolation between contacts matters when circuits have different voltages, such as a 24 V DC PLC input and a 230 V lamp. The datasheet rates all contacts for 690 V AC insulation and the same current.

LA1KN contact block family compared with the LA1KN40

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

Mounting and ratings of the LA1KN40

The block clips on the front of TeSys K LC1K contactors and CA2K and CA3K relays, according to the datasheet. Terminals are screw clamps for 0.34 to 1.5 mm² flexible with ferrule.

Like its siblings, it is rated 690 V AC and 10 A at 50 °C, and the minimum switching values of 5 mA at 17 V apply to every contact.

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.

LA1KN40 choice list

• Four NO contacts; no interlock contacts.
• Contactor family LC1K, CA2K or CA3K.
• Check whether circuits at different voltages need physical separation.
• Check the cabinet temperature against 50 °C.
• Use the LA1KN04 where four NC contacts are needed.

Wiring the LA1KN40 neatly

Four contacts mean eight screw terminals, so plan the wire routing before the block is clipped on. Ferrules are essential for the 0.34 mm² end of the range.

Tighten to 1.3 N.m and test each contact, with and without the contactor energised, before closing the cabinet.

LA1KN40 in Oman and GCC installations

Sequential start systems, conveyors and process lines in the region use auxiliary contacts to start downstream equipment only after the upstream contactor is on. A four-NO block on one TeSys K contactor can release several of these in a single step.

Equally, a single contactor in a HVAC package might report its state to a BMS, a local lamp, a timer and an alarm logger.

Information to send with an RFQ for the LA1KN40

• 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 LA1KN40 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.