LAD4VU

What does this suppressor module do?

This module is designed to limit voltage spikes generated when a contactor or control relay coil is switched off. By reducing these transient peaks, it helps protect associated control circuit components and can improve overall switching behaviour in the panel.

What type of suppression technology does it use?

It uses varistor-based peak limiting. This means the module reacts to overvoltage events across the coil circuit and clamps the surge to a controlled level rather than allowing a higher switching spike to pass through the circuit.

What control circuit voltage is it intended for?

This version is intended for 110 to 250 V AC control circuits at 50/60 Hz. It should be matched to the coil voltage range of the device it is being fitted to.

Can it be used on both 50 Hz and 60 Hz systems?

Yes. It is specified for AC control circuits operating at either 50 Hz or 60 Hz within the 110 to 250 V AC range.

Which Schneider devices is it compatible with?

It is used with selected Schneider TeSys contactors and control relays, including 3-pole LC1D09 to LC1D38, 4-pole LC1DT20 to LC1DT40, 4-pole LC1D098 to LC1D258, and CAD32 and CAD50 units. In practice, LAD4VU is chosen as a coil suppression accessory for these compatible ranges.

How is it mounted?

The module is designed for clip-on installation. Current product data identifies the mounting location as the front of the compatible device, allowing straightforward fitting as an accessory without needing a separate enclosure.

Does this module take up much space?

No. It is a compact accessory with an individual packed size of approximately 1.1 cm high, 10.0 cm wide and 4.0 cm long, and a net weight of about 0.012 kg. It is intended to add suppression without significantly increasing panel space requirements.

What is the maximum peak voltage rating?

The maximum peak voltage is specified as 2 Uc. In simple terms, the module is designed to limit transient peaks to a defined multiple of the control circuit voltage rating.

What environmental conditions is it suited for?

It is rated for operation in ambient temperatures from -25°C to +55°C, with storage temperatures from -40°C to +80°C. This makes it suitable for a wide range of industrial control panel environments when used within its stated ratings.

What level of ingress protection does it have?

It has an IP2X degree of protection in accordance with IEC 60529. This indicates protection against access to hazardous parts with a finger-sized object under the defined test conditions.

Which standards and approvals are associated with it?

The module is associated with IEC 60947-5-1, EN 60947-5-1, CSA C22.2 No 60947-5-1, UL 60947-5-1 and GB/T 14048.5. It is also shown with UL and CSA product certifications in the published product data.

When would this be a suitable choice in a control panel?

It is a suitable choice when an AC coil circuit within the stated voltage range needs surge suppression at the contactor or relay itself. It is commonly selected to reduce switching transients on compatible Schneider TeSys devices where a compact, clip-on varistor module is preferred.