Schneider LADT4 Time Delay Auxiliary Contact Block, TeSys Deca, 1NO+1NC, On-Dela

The Schneider Electric LADT4 is a time delay auxiliary contact block from the TeSys Deca range, designed to mount on the front of TeSys D contactors and TeSys F contactors. It provides 1 NO + 1 NC contact configuration with on-delay (delay-on-energise) timer function, offering an adjustable time delay range of 10 to 180 seconds.

Technical specifications:

• Commercial reference: LADT4
• Manufacturer: Schneider Electric
• EAN:
• Series / range: TeSys Deca
• Product type: Time delay auxiliary contact block
• Contact configuration: 1 NO + 1 NC
• Timer type: On-delay (delay-on-energise)
• Time delay range: 10...180 s
• Rated operational voltage [Ue]: 690 V AC, 25...400 Hz
• Rated operational current [Ie]: 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
• Rated insulation voltage [Ui]: 690 V (IEC 60947-5-1) / 600 V (UL, CSA)
• Conventional thermal current [Ith]: 10 A at 60 °C
• Making capacity (Irms): 140 A at 690 V AC / 250 A at 690 V DC
• Short-time withstand current: 100 A / 1 s, 120 A / 500 ms, 140 A / 100 ms at 60 °C
• Fuse protection type: gG 10 A
• Mechanical durability: 5 million operating cycles
• Minimum switching current: 5 mA
• Minimum switching voltage: 17 V
• Non-overlap time: 1.5 ms (opening and closing)
• Insulation resistance: over 10 MOhm
• Connection type: Screw terminals, 1...2.5 mm² flexible or rigid conductors, 1 or 2 cables
• Tightening torque: 1.7 N.m
• Mounting location: Front face
• Dimensions (WxHxD): 44 x 48 x 61 mm
• Colour: Dark grey
• IP protection: IP20 (IEC 60529)
• Operating temperature: -40...70 °C
• Storage temperature: -60...80 °C
• Operating altitude: up to 3000 m
• Weight: 74 g
• Standards: EN/IEC 60947-5-1, UL 60947-5-1, CSA C22.2 No 60947-5-1, GB/T 14048.5, EN 50012
• Certifications: IECEE CB Scheme, UL, CSA, CCC, EAC, UKCA
• Warranty: 18 months

Features and benefits:

• Adjustable on-delay timer (10 to 180 s) adds timing control directly to TeSys D and TeSys F contactors without external timer modules
• Front-mounted design fits directly onto compatible TeSys Deca CAD, LC1D, LC1F, and CR1F devices
• 1 NO + 1 NC contact arrangement provides flexible switching logic in control circuits
• Wide operating temperature range of -40 to 70 °C suits demanding industrial environments
• 1.5 ms non-overlap time between NC and NO contacts prevents momentary cross-connection during switching
• Screw terminal connection accepts 1...2.5 mm² flexible and rigid cables for straightforward panel wiring

Applications:

• Motor star-delta starting sequences requiring timed transition between contactor stages
• Industrial automation panels where contactor switching must be delayed after control signal energisation
• HVAC and refrigeration control systems requiring time-delayed compressor or fan motor starts
• Process control and conveyor systems needing sequenced start timing between drives
• Machine control panels built around TeSys D or TeSys F contactor assemblies

Compliant with EN/IEC 60947-5-1, UL 60947-5-1, CSA C22.2 No 60947-5-1, and GB/T 14048.5. Part of the Schneider Electric TeSys Deca range.

Also known as: Schneider LADT4, Schneider Electric LADT4, TeSys D time delay auxiliary contact block, on-delay timer contact block.