SCHNEIDER ELECTRIC LADR4

Schneider Electric LADR4 Pneumatic Timer Block

Description

The Schneider Electric LADR4 is a pneumatic off-delay timer block designed for the TeSys D and TeSys F contactor ranges. It provides a reliable, adjustable time delay from 10 to 180 seconds upon de-energization of the contactor coil. This module features one normally open (NO) and one normally closed (NC) contact, making it versatile for various control circuit applications.

Specifications

• Manufacturer: Schneider Electric
• Type: LADR4
• Product Range: TeSys D, TeSys F
• Function: Pneumatic Off-Delay Timer
• Time Delay Range: 10 to 180 seconds
• Contact Configuration: 1 NO + 1 NC
• Rated Insulation Voltage (Ui): 690 V
• Conventional Thermal Current (Ith): 10 A
• Mounting: Front mount on contactor

Label Info

• Standard: IEC/EN 60947-5-1
• Certifications: CE, UL, CSA (SP), CCC

Application

Ideal for motor control applications where a delayed stop is required after the main power is cut. Common uses include fan delay in ventilation systems, pump-off delays, and sequential process control in industrial machinery.

Country of Origin

Made in France.

CO2 Impact

Opting for this pre-owned LADR4 timer block prevents the emission of approximately 2.6 kg of CO2 compared to manufacturing a new one. This saving is equivalent to the CO2 sequestered by a tree over several months.

Availability

This item is an obsolete component but is available from our stock. Order now from spareparts2day for expert support and fast delivery.

FAQ

What is the operational principle of this pneumatic timer?

The LADR4 operates pneumatically. When the contactor coil is de-energized, a bellows system inside the timer controls the timing delay before the contacts change state. It does not require any separate electrical power for its timing function.

Which specific contactor series is the LADR4 compatible with?

This timer block is designed for direct front mounting on Schneider Electric TeSys D (LC1D), TeSys F (LC1F), and TeSys Deca (CAD) contactors and control relays.

Is any external power source required for the timing function of the LADR4?

No, the timing mechanism is purely pneumatic and is activated by the mechanical movement of the contactor it is mounted on. It derives its operational energy from the contactor’s de-energization.

Last Update: Friday, March 13, 2026

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