Schneider Electric LADN40 TeSys D 4 NO Front Contact Block

LADN40: four normally open contacts in one TeSys D front block

The LADN40 is a Schneider Electric TeSys D front auxiliary contact block with four normally open contacts. It suits a contactor whose job is to start or signal many things at once and which has no interlock role. Seven Star LLC supplies the LADN40 in Oman and the GCC as an independent supplier based in Muscat.

The reference 40 reads four NO, no NC. The datasheet lists the block with IP2X protection, 44 mm width and screw clamp terminals, making it the all-closing counterpart of the LADN22 and LADN31.

Technical specifications of the LADN40

LADN40 electrical details

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.

Compatibility is the same as other front blocks: TeSys D and Deca LC1D and CAD, TeSys F LC1F and CR1F. The block is 44 mm wide, 48 mm high and 42 mm deep.

LADN family: the LADN40 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.

Four closing contacts in the LADN40

A single contactor can feed four independent circuits: a seal-in, a run lamp, a PLC feedback and a sequence start. Because all contacts are normally open, they close together with the contactor and are open whenever the coil is off.

If the scheme needs a lockout, add a block with NC contacts. The LADN40 is for signal-heavy schemes.

LADN40 wiring and verification

Plan wiring for eight terminals with ferrules. Torque 1.7 N.m. Check the four contacts close together when the contactor is operated manually.

Where circuits at different voltages share the block, separate the wires with sleeves and note the voltages on the schematic.

LADN40 selection checklist

• Four NO contacts.
• Four separate circuits should be at compatible voltages, or physically segregated in the cabinet.
• Width: 44 mm.
• Contactor type from the datasheet list.
• Protection: IP2X per the datasheet.

LADN40 uses in Oman and the GCC

Large ventilation systems, pump halls and conveyor lines use contactors that start the next stage of the sequence. The LADN40 provides several such commands from the main contactor at once.

Equally it suits skids that must report status to a PLC, a local panel, a fire system interface and a counter at the same time.

Information to send with an RFQ for the LADN40

• 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

Storage, handling and spares for the LADN40

Keep the LADN40 in its original packaging in a dry, dust-free store until installation, and check the label against the order before fitting. For plants that run continuously, holding one spare unit on site shortens downtime if a replacement is needed during a shutdown or after a fault. Record the reference and installation date in the maintenance log so the next order can be placed quickly.

Documents and quotation

A datasheet for the LADN40 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.