Schneider Electric LADR2 TeSys D Off-Delay Timer Block 1-30 s

LADR2: off-delay timer block covering 1 to 30 seconds

The LADR2 is a Schneider Electric TeSys D time delay auxiliary contact block with an off-delay function and a range of 1 to 30 seconds. It is the mid-range off-delay unit and the one most users reach for when a few seconds is not enough. Seven Star LLC supplies the LADR2 in Oman and the GCC as an independent supplier based in Muscat.

Compared with the LADR0 (0.3 to 3 s), the LADR2 stretches the range ten times while keeping the same off-delay logic, contacts and housing.

Technical specifications of the LADR2

LADR2 electrical and mounting data

The block fits on the front of TeSys D and TeSys Deca contactors and CAD relays, and on TeSys F LC1F and CR1F, which is the range compatibility line in the datasheet. It has one normally open and one normally closed time-delayed contact and measures 48 mm high, 44 mm wide and 61 mm deep. Rated operational voltage is 690 V AC at 25 to 400 Hz, thermal current is 10 A at 60 °C, rated current is 6 A at 120 V AC-15 and 1.04 A at 690 V AC-15, and the making capacity is 140 A AC. Mechanical durability is 5 Mcycles, the minimum switching level is 5 mA at 17 V, and the protection is IP20. The ambient air temperature range is -40 to 70 °C and the altitude limit is 3000 m.

LADR2 ordering checklist

• Function: off delay with 1 to 30 s range.
• Contacts: one NO and one NC, time delayed.
• Check mechanical space: 61 mm depth in front of the contactor.
• Check the contactor family against the list in the datasheet.
• Alternative: LADR0 for 0.3 to 3 s.

Choosing between the LADR0 and LADR2 delay ranges

The delay dial of a block works best in the middle of its scale. If the needed time is 2 to 3 seconds, either block would work, but the LADR2 would run at the low end where the scale is compressed, while the LADR0 would run near the top. For 5 to 25 seconds the LADR2 is the natural fit.

Beyond 30 seconds neither off-delay block applies, and a separate timing relay is the better answer.

LADR2 in Oman and GCC plants

Run-on timers of 10 to 30 s are common for cooling fans on large motors and drives, for lube-oil pumps after compressor stop, and for post-purge on small burners and heaters.

Skid-mounted equipment from export builders often includes this block, and it is a standard spare.

Timer block family: the LADR2 against its siblings

The five timer blocks below share the housing and contact ratings and differ in function and range.

Commissioning the LADR2

Fit the block, tighten the terminals to 1.7 N.m, then set the delay with the contactor energised and measure it with a stopwatch. Record the set time on the maintenance card.

Re-measure after a service, because a block that has been knocked or has aged may drift from its dial setting.

Information to send with an RFQ for the LADR2

• Full reference and quantity required
• Contactor model the block mounts on
• Delay function (on or off) and time range needed
• Control voltage and load of the timed contacts
• Delivery location and timing

Storage, handling and spares for the LADR2

Keep the LADR2 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 LADR2 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.