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Brand: Schneider Electric
Schneider Electric LADT4 TeSys D On-Delay Timer Block 10-180 s
Description
LADT4: long-range on-delay timer block for 10 to 180 seconds
The LADT4 is a Schneider Electric TeSys D time delay auxiliary contact block with on-delay and a range of 10 to 180 seconds. It has one normally open and one normally closed contact. Seven Star LLC supplies the LADT4 in Oman and the GCC as an independent supplier based in Muscat.
The LADT4 is the longest-range block in this group. Where the other four stop at 30 seconds, it reaches three minutes, which opens up warm-up, pre-lubrication and slow sequencing tasks.
Technical specifications of the LADT4
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Schneider Electric / LADT4 |
| Description | Product datasheet Time delay auxiliary contact block, TeSys D, 1NO + 1NC, on delay 10-180s, front, screw clamp terminals |
| Range | TeSys; TeSys Deca |
| Product name | TeSys Deca |
| Product or component type | Time delay auxiliary contact block |
| Range compatibility | TeSys Deca CAD; TeSys Deca LC1D; TeSys F LC1F; TeSys F CR1F |
| Mounting location | Front |
| Pole contact composition | 1 NO + 1 NC |
| Contacts operation | Time delay |
| Timer type | On delay |
| Time delay range | 10 to 180 s |
| [Ue] rated operational voltage | 690 V AC 25 to 400 Hz |
| [Ie] rated operational current | 6 A at 120 V AC-15; 1.04 A at 690 V AC-15; 0.55 A at 125 V DC-13; 0.1 A at 600 V DC-13 |
| [Ui] rated insulation voltage | 690 V conforming to IEC 60947-5-1; 600 V conforming to UL 60947-5-1; 600 V conforming to CSA C22.2 No 60947-5-1 |
| [Ith] conventional free air thermal | 10 A (at 60 °C) |
| Standards | EN/IEC 60947-5-1; UL 60947-5-1; CSA C22.2 No 60947-5-1; GB/T 14048.5; EN 50012; IEC 60335-1:Clause 30.2; IEC 60335-2-40:Annex JJ; UL 60335-2-40:Annex JJ |
| Product certifications | IECEE CB Scheme; UL; CSA; CCC; EAC; UKCA |
| Irms rated making capacity | 140 A at <= 690 V AC conforming to IEC 60947-5-1; 250 A at <= 690 V DC conforming to IEC 60947-5-1 |
| Permissible short-time rating | 100 A 60 °C 1 s; 120 A 60 °C 500 ms; 140 A 60 °C 100 ms; are subject to change – check with your local distributor. |
| Protection type | GG fuse 10 A |
| Mechanical durability | 5 Mcycles |
| Minimum switching current | 5 mA |
| Minimum switching voltage | 17 V |
| Non-overlap time | 1.5 ms on de-energisation no overlap between NC and NO contact; 1.5 ms on energisation no overlap between NC and NO contact |
| Insulation resistance | > 10 MOhm |
| Connections – terminals | Screw clamp terminals 1 cable(s) 1 to 2.5 mm²flexible with cable end; Screw clamp terminals 1 cable(s) 1 to 2.5 mm²flexible without cable end |
| Height | 48 mm |
| Width | 44 mm |
| Depth | 61 mm |
| Environmental characteristic | Normal environment |
| IP degree of protection | IP20 conforming to IEC 60529 |
| Ambient air temperature (operation, as listed) | -40 to 70 °C |
| Operating altitude | 3000 m |
Timer block family: the LADT4 against its siblings
The five timer blocks below share the housing and contact ratings and differ in function and range.
| Reference | Timer type | Delay range | Application noted |
|---|---|---|---|
| LADR0 | Off delay | 0.3 to 3 s | Not stated |
| LADR2 | Off delay | 1 to 30 s | Not stated |
| LADS2 | On delay | 1 to 30 s | Star delta starter |
| LADT2 | On delay | 1 to 30 s | Not stated |
| LADT4 | On delay | 10 to 180 s | Not stated |
Where a 10 to 180 second delay is needed
Some starting conditions take longer than half a minute: a lube-oil pump has to build pressure before a compressor may run, a heater element has to warm a fluid before a pump starts, and a large fan has to purge a duct before a burner lights.
The LADT4 has a minimum setting of 10 s, so it is unsuitable for quick delays; for under 10 s use a LADT2 or LADS2.
LADT4 checklist before ordering
- On delay, 10 to 180 s range.
- Contacts: 1 NO + 1 NC.
- Compare the real process time with the dial limits.
- Contactor family: as listed in the datasheet.
- Same housing as the other timer blocks, 61 mm deep.
LADT4 in Oman and the GCC
Long on-delays are used in oil and gas skids for pre-lube and purge, in desalination plants for sequenced start of pumps and dosing, and in HVAC plant rooms for staged starting.
In hot environments, a post-start delay lets cooling fans reach full speed before the load is applied.
LADT4 ratings and fit
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.
Setting the LADT4 on site
Install the block, torque the terminals at 1.7 N.m and set the dial. Timing a delay of minutes takes patience, but the check is worth it: measure at least once at the final setting.
Note the setting on the as-built drawing, because a long delay that looks like a fault to the next shift can lead to someone bridging the contact.
Information to send with an RFQ for the LADT4
- 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
Documents and quotation
A datasheet for the LADT4 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.
Other Models in the Se Tesys D Timer Range
Seven Star LLC supplies models from the Se Tesys D Timer range in Oman and the GCC. Compare the related models below and request a quote for the one that matches your application.
| Model | Category | |
|---|---|---|
| Schneider Electric LADR0 TeSys D Off-Delay Timer Block 0.3-3 s | Contactors & Overload Relays | View details |
| Schneider Electric LADR2 TeSys D Off-Delay Timer Block 1-30 s | Contactors & Overload Relays | View details |
| Schneider Electric LADS2 TeSys D On-Delay Timer Block 1-30 s | Contactors & Overload Relays | View details |
| Schneider Electric LADT2 TeSys Deca On-Delay Timer Block 1-30 s | Contactors & Overload Relays | View details |
| Schneider Electric LADT4 TeSys D On-Delay Timer Block 10-180 s | Contactors & Overload Relays | You are viewing this model |
Datasheets & Documents
- Datasheet Schneider Electric LADT4 Datasheet Download
Reviews (0)
About brand
Schneider Electric is the French group for energy management and industrial automation: low and medium voltage switchgear and circuit breakers, motor control, drives, PLCs, power monitoring, UPS systems and building management. Its history goes back to 1836, when the brothers Adolphe and Eugène Schneider took over the iron and steel works at Le Creusot in Burgundy. Over the 20th century the company left steel and heavy engineering and became an electrical group through acquisitions such as Merlin Gerin, Télémécanique, Square D and Modicon. Its head office is in Rueil-Malmaison near Paris, and its shares are listed on Euronext Paris.
Schneider Electric company profile
| Origins | 1836, Le Creusot, France: Adolphe and Eugène Schneider take over the Le Creusot foundry |
|---|---|
| Headquarters | Rueil-Malmaison (Paris region), France |
| Ownership | Public company listed on Euronext Paris |
| Key acquisitions | Télémécanique (1988), Square D (1991), Merlin Gerin (1992), Modicon (1997), APC (2007), Invensys (2014); majority owner of AVEVA software |
| Brand names still in use | Acti9, ComPacT and MasterPacT breakers, TeSys motor control, Altivar drives, Altistart soft starters, Modicon PLCs, Harmony control components, PowerLogic and Easergy protection and metering, APC UPS, EcoStruxure software platform |
| Product families | Low voltage distribution, medium voltage switchgear and protection relays, motor control and drives, PLCs and HMIs, power meters, UPS and cooling, enclosures, building automation and energy software |
Milestones
- 1836: The Schneider brothers acquire the Le Creusot works; the business grows in steel, locomotives and heavy engineering.
- 1975: First investment in Merlin Gerin, a French maker of electrical distribution equipment.
- 1988–1992: Télémécanique, Square D (USA) and Merlin Gerin join the group, making it an electrical specialist.
- 1997: Modicon, the company behind the first programmable logic controller, joins the group.
- 1999: The group takes the name Schneider Electric.
- 2007 and 2014: APC (UPS and data centre power) and Invensys (process automation) are acquired.
Choosing Schneider Electric breakers and motor control
Circuit breakers are chosen by current and breaking capacity. Acti9 miniature circuit breakers (iC60, C120) protect final circuits up to 125 A. ComPacT NSX molded case breakers cover about 16 to 630 A, and the letter after the frame size sets the breaking capacity: B, F, N, H, S, L from lowest to highest. MasterPacT air circuit breakers are used as main incomers on large switchboards. For motors, a TeSys contactor with an LRD overload relay or a GV2 motor circuit breaker suits direct starting, an Altistart soft starter reduces starting current, and an Altivar drive controls speed. The breaking capacity must always be at least the prospective short-circuit current at the point of installation.
Where Schneider Electric products are used
In Oman and the GCC, Schneider Electric equipment is found in main and sub-main switchboards of commercial and residential buildings, motor control centres in water, oil and gas and industrial plants, substations protected by Sepam and Easergy relays, data centres powered by Galaxy and APC UPS systems, and buildings controlled by EcoStruxure Building Operation.
APC by Schneider Electric: UPS and critical power
Since 2007, APC has been part of Schneider Electric and is now its product brand for uninterruptible power supplies, replacement batteries, battery packs, network management cards and rack power distribution. Our APC catalogue covers Smart-UPS line-interactive and on-line models, Easy UPS On-Line, the modular Symmetra LX, RM and PX ranges, Silcon three-phase systems and their spare part kits, and the RBC cartridges that keep them running. Schneider Electric breakers, drives and PLCs can be quoted together with APC UPS systems in one request.
Schneider Electric products we list
| Family | Examples |
|---|---|
| Circuit breakers | Acti9 iC60N, C120N, NSX100F, NSX250N, NSX630, EasyPact EZC, MasterPacT MTZ1, MasterPacT NW |
| Motor control | TeSys Deca LC1D, TeSys F, LRD overload relay, GV2ME08, Altistart 22, Altistart 480 |
| Drives | Altivar 12, Altivar 320, ATV340, Altivar Process 630, ATV930, Lexium 32 servo |
| PLCs, HMIs and relays | Modicon M221, M241, M580 BMEP582040, Zelio Logic, Magelis HMISTU655 |
| Protection, metering and power | Sepam series 20, Easergy P3U30, MiCOM P139, PM5560, iEM3255, Galaxy VS UPS |
Ordering Schneider Electric products: what we need
Send the commercial reference from the label (for example LC1D18M7 or ATV320U22N4C). For breakers, confirm the rated current, number of poles, breaking capacity and trip unit. For contactors, give the coil voltage. For drives, give the motor power and supply voltage. APC products are listed on their own brand page.
Facts checked against Schneider Electric's published company history, October 2026.
Browse Schneider Electric products by category: Circuit Breaker, Electrical & Power Modules, AC Drives, PLC & I/O Cards, Metering Systems, UPS and Batteries.
FAQ
Questions about the Schneider Electric LADT4 TeSys D On-Delay Timer
Answers from our engineering team on installation, compatibility and integration.
01What is the delay range of the LADT4?
10 to 180 seconds. See the datasheet linked on this page for the full figures.
02Is the LADT4 on delay?
Yes, on delay. See the datasheet linked on this page for the full figures.
03What contacts does the LADT4 have?
1 NO + 1 NC time delayed. Check that this arrangement matches your control circuit before ordering.
04What current rating applies?
6 A at 120 V AC-15; 10 A thermal at 60 degrees C.
05What are the dimensions?
48 mm high, 44 mm wide, 61 mm deep. See the datasheet linked on this page for the full figures.
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