Schneider LADN20 Auxiliary Contact Block

Model: LADN20

Brand: Schneider Electric

Product Series: Matching accessories for TeSys D / TeSys Deca contactors

Product Type: Front snap-on instantaneous auxiliary contact block

Contact Configuration: 2NO (2 Normally Open contacts, no Normally Closed contacts)

Mounting Method: Direct snap-fit on contactor front face, tool-free installation

Applicable Contactors: LC1D09~LC1D150, CAD control relays, LC1F / CR1F series contactors

2. Model Code Breakdown
3. LADN: General prefix for front-mounted auxiliary contacts of TeSys D series
4. 2: Total number of contact circuits = 2
5. 0: Number of NC (Normally Closed) contacts = 0

Full definition: 2 Normally Open, 0 Normally Closed auxiliary contacts

Universal naming rule for the same series:

LADN02: 0NO, 2NC

LADN11: 1NO, 1NC

LADN22: 2NO, 2NC

3. Terminal Markings & Wiring Definition

Two independent NO circuits with standard terminal numbers:

1st NO circuit: 53 (input), 54 (output)

2nd NO circuit: 63 (input), 64 (output)

Terminal structure: Screw-clamp terminals, tightening torque 1.7 N·m

Compatible wire cross-sections:

Single solid wire / ferrule-equipped flexible wire: 1~4 mm²

Two parallel wires: 1~2.5 mm²

4. Core Electrical Specifications

4.1 Rated Insulation Voltage Ui

690 V (IEC standard); UL/CSA certified for 600 V

4.2 Conventional Thermal Current Ith

10 A (ambient temperature 60°C)

4.3 AC-15 AC Control Load (Solenoid Valves / Coils / Indicator Lamps)

120 V AC: 6 A

230 V AC: 3 A

400 V AC: 1.8 A

690 V AC: 1.04 A

4.4 DC-13 DC Inductive Load

125 V DC: 0.55 A

600 V DC: 0.1 A

4.5 Minimum Operating Condition (Suitable for Weak Signals)

Minimum switching voltage: 17 V; Minimum switching current: 5 mA

4.6 Contact Operation Timing

No overlap time between make and break: 1.5 ms (NO and NC contacts never conduct simultaneously)

4.7 Protection & Environmental Parameters

Protection Class: IP20 (for indoor cabinet use only)

Operating Temperature: -25℃ ~ +60℃

Mechanical Life: ≥ 30 million operations

Electrical Life (under standard load): ≥ 1 million operations

4.8 Dimensions & Weight

Dimensions: 48 (H) × 26 (W) × 42 (D) mm; Net weight ≈ 30 g

5. Certifications & Standards

Certifications: CCC, CE, UL, CSA, EAC, UKCA

Compliant Standards: GB/T 14048.5, IEC 60947-5-1, EN 50012

6. Functions & Application Scenarios
7. Motor Start-Stop Feedback: Two independent passive NO signals after contactor closure, sent to PLC, indicator lamps and upper computer for operating status collection
8. Expansion of Electrical Interlocks: Add interlock contacts for dual-motor and forward/reverse control circuits
9. Multi-channel Alarm Output: One circuit for local panel lamps, one for remote control cabinet signals
10. Control Circuit Expansion: Supplement auxiliary contacts when factory-built contacts are insufficient (LC1D standard configuration only includes 1NO+1NC)

Applicable Industries: Machine tools, HVAC, water pumps, fans, automatic production line control cabinets

7. Selection Table for LADN Front-Mounted Contacts of the Same Series

8. Installation & Replacement Instructions
9. Installation: Align with the front slot of the contactor and press down until a snap sound is heard for locking; for removal, pinch both side latches and pull upward
10. Installation Limit: A single LC1D contactor can be fitted with maximum 1 front LADN contact block. The LAD8N series side-mount modules are required for additional contacts
11. Alternative Models

Domestic equivalents with identical functions: Delixi F4-20, Chint F4-20

Schneider side expansion contacts: LAD8N20 (side-mounted 2NO contacts)

9. Strict Usage Prohibitions
10. Not allowed for main power circuits; only applicable to control signals and small coil loads (AC-15 / DC-13)
11. Forbidden to operate above the rated insulation voltage of 690 V
12. Cannot be exposed outdoors or in humid unprotected environments (IP20 rating limited to cabinet interior)
13. Do not connect multiple 4 mm² wires to one single terminal; maximum cross-section for parallel wiring is 2.5 mm²

Full Application Fields of Schneider LADN20 Auxiliary Contact Block

1. General Industrial Automation
2. Conveying Line Equipment

Collect contactor status for belt conveyors, roller lines, transfer machines and lifting positioning mechanisms. Two NO circuits separately transmit local lamp signals and operation data to PLC.

2. Custom Non-standard Automation Machines

Expand original contactor contacts on assembly machines, inspection equipment and stamping loading/unloading machines to upload equipment running status remotely.

3. Robot Supporting Control Cabinets

Monitor solenoid valve circuits for robot external axes and fixture clamping; two isolated passive signals avoid mutual interference.

2. Machine Tool Processing Industry (Main Application Scenarios)
3. CNC Lathes, Machining Centers, Milling Machines

Expand contacts for spindle motors, cooling pumps and chip conveyors. One signal feeds local panel running lamps, the other transmits ready signals to the machine tool system.

2. Grinding Machines & Drill-Tap Centers

Collect start-stop status of lubrication pumps and hydraulic stations to meet the demand for synchronous multi-signal output on machine tools.

3. Stamping & Sheet Metal Machines

Realize status interlock and signal upload for main hydraulic motors and feeding motors.

3. HVAC, Water Supply & Drainage, Building Electromechanical Systems
4. Fan & Water Pump Control Boxes

For air conditioning fans, cooling tower fans, circulating pumps and sewage pumps, two NO contacts deliver local indication signals and communication data to building BA systems respectively.

2. Central Air Conditioning Units

Expand contact terminals for chillers and condensate pumps for remote building monitoring.

3. Fire-fighting Supporting Equipment

Upload operating status of smoke exhaust fans and sprinkler pumps to fire alarm control panels.

4. Lifting Equipment, Logistics & Warehousing Machinery
5. Overhead Cranes & Electric Hoist Control Cabinets

Collect running signals of lifting, cross-travel and long-travel contactors. Two signal channels serve local display and upper warehouse management systems separately.

2. Automated Warehouses & Stackers

Transmit status feedback of traveling motors and fork lifting motors for stacker safety interlock judgment.

5. Energy, HVAC & Environmental Protection Equipment
6. Air Compressor & Vacuum Pump Control Cabinets

Monitor main loading motors and cooling fans; upload operation data to energy management systems for runtime statistics.

2. Sewage Treatment Equipment

Multi-channel status collection for aeration fans, dosing pumps and sludge transfer pumps.

3. PV Auxiliary Equipment

Output start-stop signals for cooling fans and circulating water pumps.

6. Rubber & Plastic, Packaging & Printing Industry
7. Injection Molding & Extrusion Machines

Transmit operation feedback of screw motors, mold temperature machine water pumps and conveyor belts.

2. Packaging & Printing Machines

Two independent signal outputs for film feeding and winding motors to distinguish local alarm and remote monitoring signals.

7. Rail Transit & EV Charging Pile Supporting Systems
8. Status collection for charging pile cooling fans and main contactors
9. Signal expansion for station ventilation and water pump electromechanical control cabinets
10. Application Matching Features (Matching LADN20’s 2NO-only characteristic)

Universal requirement across all industries: only collect power-on running status without open-circuit fault signals; two isolated passive switching signals with separate grounding and no voltage conflict.

Select LADN11 (1NO+1NC) if both running and shutdown fault signals need to be collected simultaneously.