Schneider CAD32MD Replacement for TeSys Series

Product Overview

Schneider CAD32MD Replacement for TeSys Series: Smooth Transition & Legacy System Compatibility

When your existing control panel relies on the Schneider Electric CAD32MD auxiliary relay — a 3NO+2NC, 220V DC coil unit from the proven TeSys series — any unplanned failure or end-of-availability notice can threaten production continuity. This listing provides a verified, specification-matched replacement and upgrade solution for the CAD32MD, engineered to support seamless migration from aging or discontinued relay configurations without requiring panel redesign, rewiring, or PLC reprogramming.

The CAD32MD is a 10A auxiliary contactor relay widely deployed in motor control centers (MCCs), machine tool panels, conveyor systems, and process automation cabinets. Its 3NO+2NC contact configuration and 220V DC coil voltage make it a staple in legacy Schneider TeSys D and TeSys K control architectures. As industrial facilities modernize or face obsolescence of original components, sourcing a compatible, tested replacement becomes a critical procurement priority.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful CAD32MD migration rarely involves a single component. In practice, engineers upgrading or retrofitting a TeSys-based control panel will encounter several interdependent components that must be evaluated for compatibility. The following describes the typical upgrade pathway and the associated components commonly addressed during the process.

In motor control centers using the TeSys D series, the CAD32MD typically works alongside LC1D contactor units (such as the LC1D09 or LC1D18) that handle the main power switching. When replacing the CAD32MD, it is advisable to inspect the condition of these contactors simultaneously, as they share the same control voltage rail and are subject to similar wear cycles. If the LC1D series contactors show signs of contact erosion or coil degradation, a coordinated replacement minimizes future downtime.

The coil circuit for the CAD32MD is often driven by a Schneider Electric Zelio Logic smart relay (SR2/SR3 series) or a discrete PLC digital output card — commonly a Modicon M340 or M580 discrete output module (BMX DDO or BMX DRA series). These modules source the 220V DC signal that energizes the CAD32MD coil. During migration, verify that the output module’s current sourcing capacity remains within specification, particularly if the replacement relay has a slightly different inrush profile.

For panels that include TeSys GV2 or GV3 motor circuit breakers, the auxiliary contact blocks (such as the GVAE11 or GVAE20 add-on blocks) interact directly with the CAD32MD in interlocking and signaling circuits. Confirm that the auxiliary contact wiring (typically terminals 13, 14, 21, 22, 31, 32) maps correctly to the replacement unit — in a direct drop-in scenario, this is a non-issue, but it becomes relevant when upgrading to a newer TeSys E or TeSys Deca platform.

Power supply integrity is another key consideration. The 220V DC coil voltage is typically derived from a Schneider Electric Phaseo ABL8 or ABL7 power supply module. Before commissioning the replacement CAD32MD, verify that the DC bus voltage is stable and within ±10% of nominal. Voltage fluctuations caused by aging capacitors in the power supply can cause intermittent relay chatter or premature coil failure — a common root cause of repeat relay failures in older panels.

If the control system includes a Magelis HMIGTO or XBTGT HMI panel for operator interface, the relay status feedback (via NO/NC contact signals back to the PLC input module) should be verified in the HMI tag database after replacement. In most cases, no software changes are required, but a functional test of all interlocked sequences is recommended before returning the machine to production.

For installations where the CAD32MD is used in a Preventa XPS safety relay circuit or emergency stop loop, the replacement unit must be verified against the safety relay’s input specifications. Safety-rated circuits require documented proof of contact reliability — ensure the replacement relay’s datasheet is retained for audit purposes.

Finally, if the panel uses Linergy or Linergy HD busbar systems for power distribution, confirm that the replacement relay’s terminal torque specifications are observed during installation to maintain connection integrity across the busbar network.

Retrofit Guidance FAQ

Q: Does the replacement CAD32MD require any rewiring?
A: No. The replacement unit uses an identical terminal layout (A1/A2 coil terminals, contacts 13/14, 21/22, 31/32, 41/42, 51/52). It is a direct drop-in replacement — existing wiring can be reconnected without modification.

Q: Is the coil voltage exactly 220V DC, or is there a tolerance range?
A: The coil is rated for 220V DC with an operational range of approximately 198V–242V DC (±10%). Ensure your DC power supply output is within this range before installation.

Q: Will my existing PLC program need to be modified?
A: No program changes are required. The CAD32MD is a hardwired relay — it has no fieldbus address or software configuration. The PLC sees only the digital output signal driving the coil and the digital input signals from the contacts, both of which remain electrically identical.

Q: Can this relay be used in a TeSys E or TeSys Deca panel?
A: The CAD32MD is natively a TeSys D/K series component. It can be physically installed in a TeSys E panel if the DIN rail spacing and terminal block layout are compatible, but we recommend verifying the panel’s mechanical drawing before ordering for cross-series installations.

Q: What communication protocols are supported?
A: The CAD32MD is a hardwired relay with no fieldbus or network interface. It is compatible with any PLC platform (Modicon, Siemens, Allen-Bradley, Mitsubishi, Omron, etc.) that provides a 220V DC digital output signal.

Q: How much physical space does the replacement unit require?
A: The replacement unit matches the original TeSys CAD32MD footprint exactly. No panel cutout modification, DIN rail repositioning, or adjacent component relocation is required.

Q: What should I check during commissioning after replacement?
A: Perform a coil energization test at rated voltage, verify all NO and NC contact continuity with a multimeter, confirm interlocking sequences with the PLC in manual mode, and document the replacement in the panel’s maintenance log before returning to automatic operation.

Warranty Assurance

Every CAD32MD replacement unit shipped by TOPNLMS is covered by a 12-month warranty from the date of delivery. Our pre-shipment inspection process includes coil resistance measurement, contact continuity verification across all 3NO and 2NC poles, insulation resistance testing, and operational cycling under rated voltage to confirm reliable pick-up and drop-out performance.

In the event of a warranty claim, our after-sales team responds within 24 business hours. We support replacement dispatch, return merchandise authorization (RMA), and technical consultation to assist with root cause analysis. Our goal is to minimize your panel downtime and ensure your procurement decision is fully protected.

Stock is maintained in Xiamen, China, with standard lead times of 3–7 business days for international express shipment (DHL / FedEx / UPS). Expedited same-day dispatch is available for urgent MRO requirements — contact us directly to confirm availability before placing your order.

All units are shipped with original packaging, a test report, and a certificate of conformity. Customs documentation (commercial invoice, packing list, HS code declaration) is prepared in compliance with international trade requirements to facilitate smooth customs clearance at your destination.

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