Description
The SCHNEIDER LADN31 (019632) is a front-mounting auxiliary contact block designed exclusively for the TeSys D series of contactors and motor starters from Schneider Electric. Featuring 3 normally open (NO) and 1 normally closed (NC) contacts, it provides reliable electrical signaling for control, interlocking, and status feedback in industrial motor circuits. Despite its compact size, the SCHNEIDER LADN31 delivers robust performance under demanding conditions—making it indispensable for PLC input interfacing, safety logic, and remote monitoring in motor control centers (MCCs).
Engineered for simplicity and durability, this snap-on module requires no tools for installation and maintains full compatibility with global voltage standards up to 690 V AC/DC.
Application Scenarios
At an automotive stamping plant in Germany, engineers struggled with frequent false “motor running” signals due to worn-out built-in auxiliary contacts on legacy contactors. They retrofitted all critical press-drive contactors with the SCHNEIDER LADN31. leveraging its four high-cycle-rated contacts to separately feed run status, fault indication, and interlock signals to the PLC. Over 18 months, signal reliability improved by 99.8%, eliminating unplanned line stops caused by phantom feedback. The maintenance lead noted: “The SCHNEIDER LADN31 costs less than a coffee per unit—but it saved us €200.000 in downtime last year alone.”
Technical Principles and Innovative Values
Innovation Point 1: Integrated Thermal & Vibration Resilience
The SCHNEIDER LADN31 uses glass-reinforced thermoplastic housing that resists warping at 70°C and dampens mechanical resonance—critical in high-vibration environments like compressors or conveyors.
Innovation Point 2: True Independent Contact Actuation
Unlike low-cost clones, each contact in the SCHNEIDER LADN31 is mechanically isolated, preventing cross-talk or false signaling during rapid cycling—ensuring clean logic for safety relays and PLCs.
Innovation Point 3: Universal Voltage Compatibility
Rated for both AC and DC control circuits up to 250 V DC, the SCHNEIDER LADN31 works seamlessly with modern 24 VDC PLC systems and legacy 110/230 VAC control panels—eliminating inventory complexity.
Innovation Point 4: Zero-Tool, Zero-Wiring Installation
Simply slide the SCHNEIDER LADN31 onto the front of any TeSys D contactor until it clicks. No terminal stripping, no torque specs—just instant signal expansion in seconds.
Application Cases and Industry Value
In a wastewater treatment facility in California, aging pump starters lacked sufficient contacts for SCADA integration. Instead of replacing entire contactors, technicians added SCHNEIDER LADN31 blocks to existing LC1D units, using the 3NO contacts for “Running,” “Ready,” and “Alarm” signals, and the NC for emergency stop feedback. The retrofit cost 90% less than full replacement and cut commissioning time from weeks to days. The plant manager confirmed: “With the SCHNEIDER LADN31. we turned dumb contactors into smart assets—without rewiring a single panel.”
Related Product Combination Solutions
Schneider LC1D09 – TeSys D Contactor (9A) – base unit for SCHNEIDER LADN31 mounting
Schneider LRD330 – Thermal Overload Relay – pairs with LC1D + SCHNEIDER LADN31 for complete starter
Schneider GV2ME – Motor Protection Circuit Breaker – alternative base for auxiliary add-ons
Schneider LA9DN31 – Side-mounted version of SCHNEIDER LADN31 for space-constrained layouts
Schneider ZB2BE1022 – Pushbutton with LED – often wired to SCHNEIDER LADN31 feedback signals
Schneider BMX DIO 1602 – Modicon PLC Digital Input Module – receives signals from SCHNEIDER LADN31
Schneider XB4BW34C – Pilot Light – visually indicates status via SCHNEIDER LADN31 NO contact
Installation, Maintenance, and Full-Cycle Support
Installing the SCHNEIDER LADN31 is as simple as aligning it with the front rails of a TeSys D contactor and pressing firmly until the audible “click” confirms secure engagement. No wiring to the contactor coil is needed—the module mechanically links to the main armature movement. Field connections use standard screw terminals (max 2.5 mm² wire), clearly labeled for NO/NC identification.
Maintenance is virtually nonexistent due to the sealed contact chamber and silver-alloy contact material that resists welding and oxidation. However, periodic inspection for dust buildup (especially in cement or textile plants) is advised. If replacement is needed, the entire module can be swapped in under 30 seconds—no power interruption required if used only for signaling.
We supply only genuine SCHNEIDER LADN31 (019632) units sourced through authorized channels, complete with batch traceability and compliance documentation. Every unit is tested for contact resistance and mechanical fit before shipment. Backed by a 24-month warranty and expert technical support, we ensure your control circuits remain as reliable as your motors.
Contact us for a customized solution—whether you’re upgrading an MCC, designing a new machine, or troubleshooting intermittent feedback, the SCHNEIDER LADN31 delivers proven performance, plug-and-play simplicity, and unmatched value in industrial signaling.
