Schneider LADR4 | Time delay auxiliary contact block, TeSys D, 1NO + 1NC, off delay 10-180 s, front mounting, screw terminals

1. Technical Specifications LADR4

• Product Reference: LADR4

• Range: TeSys D

• Device Type: Time delay auxiliary contact block

• Mounting Position: Front mounting on TeSys D contactors

• Contact Configuration: 2 contacts total

  • 1 Normally Open (NO)

  • 1 Normally Closed (NC)

• Time Delay Function: Off-delay (contacts remain engaged for a set period after coil de-energization)

• Adjustable Time Range: 10 to 180 seconds

• Control Voltage Source: Supplied through the contactor coil control circuit

• Rated Operational Voltage (Ue): Up to 690 V AC

• Insulation Voltage (Ui): 690 V

• Dielectric Strength: 6 kV

• Utilization Category: AC-15 and DC-13

• Maximum Switching Voltage: 250 V

• Rated Impulse Withstand Voltage (Uimp): 6 kV

• Mechanical Durability: Up to 5 million operations

• Electrical Durability: Up to 100,000 operations at rated load

• Connection Terminals: Screw terminals

• Mounting Compatibility: For use with TeSys D contactors (such as LC1D09…LC1D150)

• Ambient Operating Temperature: –20°C to +60°C

• Protection Class: IP20 (front face)

• Standards Compliance: IEC 60947-5-1, CE, UL, CSA

2. Key Features

• Provides adjustable off-delay timing from 10 to 180 seconds, ideal for sequencing or delay operations

• Simple front-mounting design allows direct installation on TeSys D contactors without tools

• Compact size ensures minimal additional space in control panels

• Offers mechanically linked contacts to prevent simultaneous closure of NO and NC contacts

• Screw-type terminals ensure secure, reliable connections

• Time adjustment is manual and precise, via dial on the front of the module

• Fully compliant with industrial control and automation standards

• Enables enhanced automation logic without needing a separate PLC or timer relay

• High reliability, robust construction, and long service life

3. Applications

• Used in motor control circuits to delay disconnection of auxiliary devices after the main contactor opens

• Suitable for industrial automation, packaging machines, conveyor systems, and control panels

• Ideal for sequencing operations, e.g., allowing exhaust fans or safety interlocks to remain on after motor shutdown

• Applied in HVAC systems, elevators, and lighting control where post-operation delay is needed

• Commonly used for load shedding, cooling delay, or mechanical interlocks

• Reduces the need for external time delay relays in many applications