Schneider Electric LADN22 — TeSys Auxiliary Contact Block Guide

By Abdullah Zahid
14 min read
Schneider Electric LADN22 TeSys Deca auxiliary contact block front-mount 2NO 2NC for LC1D motor starter contactor

Schneider Electric LADN22 TeSys Deca Auxiliary Contact Block: Specifications, Compatibility and Selection Guide

When a controls engineer or panel builder searches for the Schneider Electric LADN22, the decision is almost always already made at the family level — the question is whether this specific model matches the contactor on the drawing, the circuit voltage in the design, and the contact configuration on the logic diagram. The LADN22 is a front-mounted auxiliary contact block delivering 2 normally open and 2 normally closed instantaneous contacts, rated to 690V AC and 10A thermal current, designed for direct clip-on installation to TeSys D LC1D09 through LC1D150 contactors. Get those three variables right and this is a straightforward procurement call.

If you have already confirmed the LADN22 is the correct part, check current pricing and availability at LeadTime.ca — ships worldwide.

Who Should Buy the LADN22 — and Who Should Choose a Different Variant

The LADN22 is the right choice if all of the following are true for your application:

  • Your contactor is a TeSys D model in the LC1D09 through LC1D150 range — confirm this from the nameplate before ordering
  • Your control circuit operational voltage does not exceed 690V AC (600V for UL/CSA-rated installations)
  • Your control logic diagram calls for exactly 2 normally open and 2 normally closed instantaneous contacts — no timing delay required
  • Front-mount clip-on installation is feasible in your panel layout, with clearance for the 48mm x 44mm x 42mm block footprint
  • Your conductors are solid or flexible wire between 0.2 and 6 mm² (24 to 10 AWG), compatible with screw clamp termination

If your application requires delayed or timed contact switching, select the LADN40, which includes a timer function. If you are working with TeSys K contactors, legacy Telemecanique equipment, or unconfirmed TeSys F models, the LADN22 does not apply — contact LeadTime.ca to identify the correct model-specific block for your contactor.

On this page:

What the LADN22 Does in a Motor Control System

The Schneider Electric LADN22 TeSys Deca Auxiliary Contact Block is not a contactor — it is the switching logic layer that sits on top of one. It clips directly to the front face of a TeSys D contactor and adds four independently wired control contacts to the starter assembly: two that close when the contactor energizes (normally open) and two that open when the contactor energizes (normally closed). These contacts carry control-circuit signals, not main load current. They switch at a minimum threshold of 5 mA and 17V, which places them well within the operating range of PLC input modules, pilot solenoid coils, and indicator lamp circuits.

The practical value is that the LADN22 eliminates the need for a separate interposing relay or standalone auxiliary relay module when the control logic requires contactor status feedback, interlocking between drives, or permissive signals for sequencing logic. The instantaneous contact transition — with a 1.5 ms overlap time at both energization and de-energization — means the block is appropriate for any logic application that does not demand timing-delayed contact operation. For high-cycle motor control service, the 30 million mechanical cycle rating gives the LADN22 a service life that exceeds many competing soft-starter auxiliary relay accessories, supporting predictable maintenance planning in demanding applications.

The block carries UL, CSA, CCC, EAC, and UKCA certifications, making it directly usable in equipment packages destined for North American, European, UK, and Asian markets without requiring region-specific variants. That five-standard coverage reduces documentation burden for OEMs building for multinational customers.

Typical System Architecture

The LADN22 sits between the contactor coil control circuit and the downstream monitoring or permissive logic in a motor starter assembly. Here is the typical component chain in a TeSys D motor starter application:

  • PLC or control relay output card energizes the TeSys D contactor coil through the control voltage circuit
  • TeSys D contactor (LC1D09 to LC1D150) closes main contacts to connect motor to supply voltage
  • LADN22, front-mounted on the contactor, simultaneously transitions its 2NO and 2NC auxiliary contacts to reflect the contactor state
  • LADN22 NO contacts feed status signals to PLC input cards, HMI status indicators, or permissive inputs for downstream starter interlocks
  • LADN22 NC contacts provide fail-safe monitoring signals to safety circuits or emergency stop logic chains

Typical Applications for the LADN22

In manufacturing environments, the LADN22 is most commonly specified for motor starter interlocking — using its normally open contacts to prevent simultaneous start commands from reaching conflicting equipment such as forward and reverse drives, or inlet and outlet conveyors that must not run concurrently. The normally closed contacts simultaneously provide the inverse status signal to the interlock chain without requiring a separate relay.

HVAC system integrators rely on the LADN22 to implement multi-stage startup sequencing for compressors, condenser fans, and pump cascades. The 2NO contacts enable permissive logic that gates Stage 2 equipment start until Stage 1 confirmation is received, while the NC contacts flag a de-energized coil state to building management systems for alarm generation.

In water and wastewater treatment facilities, the LADN22 feeds pump run status to SCADA systems and PLC-based treatment sequencing logic. The 5 mA minimum switching threshold ensures reliable signal generation even in the electrically noisy environment typical of pump station control panels, where long cable runs and variable-frequency drive harmonics are common.

Panel builders in the process automation and food and beverage sectors use the LADN22 to independently drive pilot lights and solenoid pilot coils from the two normally open contacts, reducing the relay count and saving panel real estate. The compact 48mm x 44mm x 42mm footprint and clip-on front mount mean no additional DIN rail space or panel drilling is required.

Application Typical Deployment
Motor starter interlocking 2NO contacts block conflicting motor permissive inputs; 2NC provide reverse-logic safety signal
PLC/HMI status feedback NC contact signals coil de-energization state to PLC input for pump or motor health monitoring
Multi-stage equipment sequencing NO contacts enable permissive logic for compressor, fan, or pump cascade startup
Pilot light and solenoid control 2NO contacts independently switch indicator lamps and solenoid valve pilot coils
Safety circuit monitoring Auxiliary contacts monitor contactor state for integration into safety-rated control loops and emergency stop circuits
HVAC compressor and fan control Sequencing and status feedback in building automation motor control centers

Key Specifications and Ratings

Specification Value
Contact Configuration 2 NO + 2 NC instantaneous
Rated Operational Voltage 690V AC (25–400 Hz); 600V UL/CSA
Thermal Current Rating 10A (free air)
AC-15 Current Rating 1.04A @ 690V AC; 6A @ 120V AC
DC-13 Current Rating 0.55A @ 125V DC
Minimum Switching Threshold 5 mA / 17V
Contact Overlap Time 1.5 ms (energization and de-energization)
Mechanical Durability 30 million cycles
Operating Temperature -5°C to +60°C
Dimensions (H x W x D) 48mm x 44mm x 42mm

Full technical specifications are available on the product page at LeadTime.ca.

LADN22 vs. LADN02 vs. LADN40: Which One Do You Actually Need?

Model Contact Configuration Timer Function Best For
LADN02 2 NO only (no NC) None Applications requiring only normally open status or permissive contacts; no reverse-logic feedback needed
LADN22 2 NO + 2 NC instantaneous None Standard motor control interlocking, status feedback, and permissive logic — the most common TeSys D auxiliary contact configuration
LADN40 Includes timer function Yes — delayed switching Applications requiring time-delayed contact transition; replace LADN22 with LADN40 when timing logic is part of the control sequence

If your control logic diagram calls for instantaneous 2NO + 2NC switching on a TeSys D starter, the LADN22 is the correct selection. If any delay between contact transitions is required, specify the LADN40. If your design calls for normally open contacts only, the LADN02 covers that requirement at a reduced cost — confirm current availability of the LADN22 and related variants at LeadTime.ca.

Expert Verdict: Is the LADN22 the Right Block for Your Project?

The LADN22 is the correct choice for automation engineers and panel builders who are designing or servicing TeSys D LC1D-based motor control assemblies and need instantaneous 2NO + 2NC auxiliary contact switching for interlocking, status monitoring, or permissive logic. Its native clip-on fit to LC1D09 through LC1D150 contactors eliminates adapter hardware and retrofit complexity. The 30 million cycle mechanical rating supports high-frequency start-stop service without premature replacement planning, and the five-certification coverage — UL, CSA, CCC, EAC, UKCA — removes the need for region-specific variants when building equipment for multinational customers. OEM packagers, control system integrators standardizing on the TeSys D platform, and maintenance technicians replacing degraded blocks in existing installations all land in the ideal buyer profile for this part.

Where the LADN22 does not fit is equally important to state clearly. If your control sequence requires time-delayed contact transition, the LADN40 is the correct block — the LADN22 has no timer function and a fixed 1.5 ms overlap time that cannot be adjusted. Applications requiring more than four auxiliary contacts (beyond 2NO + 2NC) will need to stack multiple blocks or reconsider the starter architecture. The LADN22 does not mount to TeSys K contactors or legacy Telemecanique equipment. For TeSys F models, compatibility is partial and model-specific — contact your distributor for confirmation before ordering rather than assuming fit based on the TeSys family name alone. Finally, the LADN22 is a control-duty block rated at 10A thermal current in free air; it is not suitable for direct high-current load switching above that rating.

From a procurement standpoint, the LADN22 is a well-stocked part through authorized Schneider Electric distribution channels, with typical fulfillment from North American inventory within 1 to 3 business days. The primary sourcing risk is not lead time — it is wrong-model selection caused by part number confusion between the LADN22, LADN02, and LADN40. Buying through a specialist industrial distributor rather than a generic online retailer provides pre-purchase compatibility verification that eliminates the re-order cycle, plus access to volume pricing for panel builders ordering 12 or more units per project. Non-authorized overseas channels introduce counterfeit risk and mismatched revision levels that are not worth the marginal cost difference. Check current pricing and availability for the LADN22 at LeadTime.ca — we ship worldwide and can confirm compatibility before you commit to the order.

For volume pricing or to confirm lead time before committing to a build, contact the LeadTime.ca team directly — we ship worldwide.

What Engineers Need to Know Before Ordering the LADN22

Because community discussion specific to the LADN22 is sparse compared to the broader TeSys D product family, the most useful pre-purchase intelligence comes not from forum threads but from the patterns that surface consistently across general TeSys auxiliary contact block discussions on MrPLC, PLCS.net, and distributor Q&A pages — and from the compatibility and commissioning details that trip up even experienced buyers.

The single most repeated observation across TeSys auxiliary contact block discussions is that loose screw clamp terminals are the leading cause of intermittent contact operation. This is not a design defect — it is a commissioning practice issue. Engineers working with the LADN22 report reliable, long-term operation when terminal seating is verified during installation. Those who skip this step discover the failure mode during ramp-up, when intermittent operation is difficult to diagnose because it mimics PLC logic errors or sensor faults rather than pointing immediately to a mechanical connection issue.

The second recurring theme is TeSys F compatibility confusion. Multiple buyers across distributor Q&A pages have ordered auxiliary contact blocks for TeSys F models and discovered non-fitment at the installation site. The LADN22 supports all TeSys D LC1D09 through LC1D150 sizes without exception, but TeSys F compatibility is model-specific. If your installation involves a TeSys F contactor, treat compatibility as unconfirmed until you have verified the specific model against Schneider's compatibility documentation or spoken with a distributor who can confirm the fit. Skipping this step is the source of most re-order delays reported in the TeSys auxiliary block community.

Part number disambiguation is the third area where specialist advice pays off. The LADN22, LADN02, and LADN40 share the same physical form factor and front-mount clip-on design. Procurement staff working from abbreviated parts lists frequently order LADN02 (which has no NC contacts) when the control design requires LADN22, or order LADN40 (which includes a timer function) when instantaneous switching is all that is needed. The solution is always to specify the full part number LADN22 in the purchase order and cross-check the order confirmation before shipment leaves the warehouse. LeadTime.ca's specialist team performs this verification as part of the ordering process — particularly valuable for procurement professionals who are executing an engineer's specification rather than writing it themselves.

Wiring and Installation Overview

  • De-energize the contactor circuit and apply lockout/tagout per applicable electrical safety standards before mounting or wiring the LADN22
  • Clip the LADN22 onto the front face of the TeSys D contactor — positive mechanical engagement requires no tools and no panel drilling; verify the block is fully seated before proceeding
  • Strip 5 to 8 mm of insulation from each conductor and insert into the appropriate screw clamp terminal; the terminal accepts solid or flexible conductors from 0.2 to 6 mm² (24 to 10 AWG)
  • Tighten each terminal screw and perform a hand-tug on each conductor to verify grip — loose terminals are the leading cause of intermittent operation in the field
  • After restoring power, verify contact operation by monitoring indicator lamp state or using a multimeter continuity check across the 2NO and 2NC contact pairs while cycling the contactor coil

Full wiring diagrams and detailed commissioning procedures are available in the Schneider Electric LADN22 installation documentation. Engineers requiring step-by-step procedures should refer to the manufacturer's technical documentation or contact the LeadTime.ca technical team for pre-commissioning guidance.

Wrong-Part Prevention Checklist Before You Order the LADN22

Run through this checklist against your application before placing the order. Each point corresponds to a confirmed source of re-order friction or field mismatch:

  1. Verify contactor model on nameplate — confirm LC1D size (e.g., LC1D115) falls within LC1D09–LC1D150 range
  2. Confirm LADN22 not confused with LADN02 (2NO only, no NC) or LADN40 (includes timer function)
  3. Check TeSys series compatibility — LADN22 supports TeSys D all sizes; TeSys F support is model-specific (verify with distributor)
  4. Mounting location — LADN22 is front-mount only; do not attempt to retrofit top-mount positions
  5. Terminal compatibility — screw clamp requires solid or flexible conductors 0.2–6 mm²; not compatible with push-in or ring-lug terminals
  6. Voltage validation — operational circuit voltage must not exceed 690V AC; verify against power system design
  7. Instantaneous operation confirmed — if timing/delay required, select LADN40 instead
  8. Contact configuration matches logic diagram — confirm 2NO + 2NC is correct for interlocking/permissive logic

If any item on this checklist is unresolved before placing your order, contact the LeadTime.ca team — we can verify compatibility against your contactor nameplate and control logic requirements before the order ships.

Frequently Asked Questions

What is the difference between the LADN22 and LADN40, and how do I know which one my application requires?

The LADN22 provides 2 normally open and 2 normally closed instantaneous contacts, with a fixed 1.5 ms overlap time and no adjustable delay function. The LADN40 includes a timer module that introduces a deliberate delay in contact transition. If your control logic diagram calls for contacts that switch immediately when the contactor coil energizes or de-energizes, the LADN22 is correct. If any step in your sequence requires a timed delay between coil actuation and contact transition, specify the LADN40. When in doubt, share your logic diagram with your distributor for confirmation before ordering.

Is the LADN22 compatible with my TeSys F contactor?

The LADN22 is directly compatible with all TeSys D contactors in the LC1D09 through LC1D150 range — no exceptions within that family. TeSys F compatibility is partial and model-specific; not all TeSys F contactor sizes accept the LADN22. Before ordering for a TeSys F installation, collect the exact contactor model number from the nameplate and confirm fitment with an authorized Schneider distributor. Do not assume compatibility based on the TeSys family name alone — this is the most common source of ordering errors reported across TeSys auxiliary contact block discussions.

How do I verify that the LADN22 contacts are functioning correctly after installation?

With the contactor de-energized, use a multimeter in continuity mode across each NC contact pair — continuity should be present. Then energize the contactor coil and verify continuity across each NO contact pair while confirming the NC contacts have opened. Alternatively, wire an indicator lamp to one NO contact circuit; the lamp illuminating when the coil energizes confirms correct contact operation. If contacts fail to transition, check screw clamp terminal tightness first — loose conductors are the most common cause of failed contact operation and are often misdiagnosed as block failure.

What conductor size and terminal type does the LADN22 accept?

The LADN22 uses screw clamp terminals that accept solid or flexible conductors between 0.2 and 6 mm² (24 to 10 AWG). No special crimp connectors or ferrules are required, which simplifies field wiring. The terminal type is not compatible with push-in connections or ring-lug terminations. Verify that your panel wiring uses conductors within this cross-section range before specifying the LADN22 in your bill of materials.

Can I stack two LADN22 blocks on one contactor to get more than four auxiliary contacts?

Multiple auxiliary contact blocks can be installed on a TeSys D contactor to increase the total auxiliary contact count, but physical stacking arrangements depend on the specific contactor frame size and available mounting positions. Confirm the mechanical arrangement against the Schneider Electric LADN22 installation documentation and your specific LC1D model before designing a multi-block configuration. For applications regularly requiring more than four auxiliary contacts per starter, evaluate whether an integrated motor starter package provides a more cost-effective and space-efficient solution.

What certifications does the LADN22 carry, and does it cover Canadian installations?

The LADN22 carries UL, CSA, CCC, EAC, and UKCA certifications in addition to IEC 60947-5-1 and BS 4794 compliance. CSA certification specifically covers Canadian Standards Association requirements, making the LADN22 directly applicable to Canadian industrial installations without requiring additional certification documentation. The five-standard coverage also supports OEM equipment packages destined for US, European, UK, and Asian markets from a single part number.

Why Order from LeadTime.ca

  • Global shipping — LeadTime.ca fulfills orders worldwide, not just within a single region
  • Pre-purchase compatibility verification — specialist team confirms contactor model fit and contact configuration before the order ships, eliminating re-order cycles
  • Real-time inventory visibility — access to North American stock with typical 1 to 3 business day fulfillment for in-stock parts
  • Volume pricing support — panel builders and OEMs ordering 12 or more units can request bulk order pricing through the contact page
  • Authorized distribution — eliminates counterfeit risk and mismatched revision levels associated with non-authorized overseas channels

At-a-Glance Summary

  • Product: Schneider Electric LADN22 TeSys Deca Auxiliary Contact Block
  • Contact configuration: 2 normally open + 2 normally closed, instantaneous operation
  • Rated operational voltage: 690V AC (IEC); 600V (UL/CSA)
  • Thermal current rating: 10A free air
  • Minimum switching threshold: 5 mA / 17V
  • Contact overlap time: 1.5 ms at energization and de-energization
  • Mechanical durability: 30 million cycles
  • Mounting: Front-mount clip-on — no panel drilling required
  • Terminal type: Screw clamp, 0.2–6 mm² (24–10 AWG) solid or flexible conductors
  • Dimensions: 48mm H x 44mm W x 42mm D
  • Operating temperature: -5°C to +60°C
  • Compatible contactors: TeSys D LC1D09 through LC1D150 (all sizes); TeSys F model-specific — verify before ordering
  • Certifications: UL, CSA, CCC, EAC, UKCA, IEC 60947-5-1, BS 4794
  • Primary alternatives: LADN02 (2NO only, no NC), LADN40 (includes timer function)

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