Schneider Electric CAD32MD – 3NO+2NC Auxiliary Control Relay | TeSys Series Platform
Engineering Background
The CAD32MD is part of Schneider Electric’s globally recognized TeSys family of control and protection components, engineered to IEC 60947-5-1 standards. Designed for demanding industrial control circuits, this auxiliary contactor delivers reliable multi-contact switching in compact panel footprints — a staple in MCC, PLC output expansion, and interlocking logic across process and discrete manufacturing sectors.
Product Positioning
The CAD32MD targets control engineers and procurement specialists who require a proven, IEC-compliant auxiliary relay with a 220V DC coil for battery-backed or DC bus control architectures. Its 3NO+2NC contact configuration makes it ideal for complex interlocking, signal routing, and safety relay bypass circuits where contact diversity is critical.
Complete Technical Specifications
| Part Number / SKU | CAD32MD |
| Brand | Schneider Electric |
| Series / Platform | TeSys |
| Product Type | Auxiliary Control Relay (Contactor) |
| Contact Configuration | 3NO + 2NC |
| Coil Voltage | 220V DC |
| Coil Reference | MD (220V DC) |
| Rated Current (AC-15) | 6A @ 230V AC |
| Rated Current (DC-13) | 1A @ 220V DC |
| Thermal Current (Ith) | 10A |
| Insulation Voltage (Ui) | 690V |
| Impulse Withstand Voltage (Uimp) | 6kV |
| Mechanical Endurance | 30 million operations |
| Electrical Endurance (AC-15) | 1 million operations |
| Mounting | DIN rail (EN 60715) / screw |
| Terminal Type | Screw clamp, 1×2.5mm² / 2×1.5mm² |
| Degree of Protection | IP20 (front face) |
| Ambient Temperature | -40°C to +60°C (storage); -25°C to +55°C (operation) |
| Standards | IEC/EN 60947-5-1, UL 508, CSA C22.2 |
| Weight | approx. 580g |
| Country of Origin | China (Schneider Electric manufacturing) |
Proven Application Environments
- PLC Output Expansion: Amplify low-current PLC digital outputs to drive higher-load field devices via CAD32MD interposing relay circuits.
- Motor Control Centers (MCC): Interlocking and status feedback in star-delta starters, reversing contactors, and multi-motor sequencing panels.
- Safety & Interlock Logic: 3NO+2NC diversity supports both enabling and inhibiting signal paths in a single device — reducing panel wiring complexity.
- Battery-Backed DC Control Buses: 220V DC coil is optimized for substation, UPS-backed, and railway traction auxiliary control systems.
- Process Automation: DCS hardwired I/O marshalling, field junction boxes, and remote I/O panel signal conditioning.
- HVAC & Building Automation: Fan, pump, and damper control circuits requiring reliable auxiliary switching.
Engineering Advantages
- IEC 60947-5-1 Certified: Full compliance ensures interoperability with global panel-building standards and third-party audits.
- 30M Mechanical Cycles: Industry-leading mechanical endurance minimizes maintenance intervals in high-cycle applications.
- Compact DIN-Rail Footprint: Snap-on DIN rail mounting with screw terminals accelerates panel assembly and reduces wiring errors.
- Wide Temperature Range: Operational down to -25°C supports outdoor enclosures and cold-climate installations without derating.
- TeSys Ecosystem Compatibility: Direct mechanical and electrical compatibility with TeSys D/K contactors, enabling modular system expansion.
- Suppression Circuit Ready: Coil circuit accepts standard RC or diode suppression accessories (LA4DA2U / LA4DE1U) for EMC-sensitive environments.
System Architecture & Signal Flow
In a typical PLC-driven motor control application, the CAD32MD is wired as an interposing relay between the PLC digital output card (typically 24V DC, 0.5A max) and the main power contactor coil circuit (220V DC). The 3NO contacts provide three independent enabling paths — for main contactor, pilot lamp, and SCADA feedback — while the 2NC contacts simultaneously open inhibit circuits or trigger alarm relays. This architecture eliminates the need for separate relay modules and reduces terminal block count by up to 40%.
Sourcing & Quality Verification
- Authorized Supply Chain: All CAD32MD units sourced through verified Schneider Electric distribution channels with full traceability documentation.
- Incoming Inspection: Each unit undergoes coil resistance verification, contact continuity test, and mechanical operation check prior to dispatch.
- Authenticity Guarantee: Holographic labels, date codes, and factory markings verified against Schneider Electric’s product authentication database.
- Packaging Integrity: Original OEM packaging retained; anti-static and moisture-barrier packaging for long-term storage compatibility.
- Documentation Available: CE Declaration of Conformity, IEC test reports, and product datasheets available upon request.
Procurement Process
- Submit RFQ: Contact [email protected] with quantity, required delivery date, and destination port.
- Quotation & Lead Time: Formal quotation issued within 1 business day; in-stock units ship within 3–5 business days.
- Order Confirmation: Pro-forma invoice issued; payment via T/T, PayPal, or credit card accepted.
- Quality Hold Option: Pre-shipment inspection report available for orders ≥10 units at no additional charge.
- Shipping & Tracking: DHL / FedEx / UPS express with real-time tracking; EXW, FOB Xiamen terms available.
- After-Sales Support: 12-month warranty; technical support from qualified automation engineers.
Technical FAQ
Q: Can CAD32MD be used with a 220V AC coil circuit?
A: No. The MD suffix designates a 220V DC coil. For 220V AC applications, specify CAD32M7 (220–230V AC). Applying AC voltage to a DC coil will cause overheating and premature failure.
Q: What is the maximum switching frequency?
A: Up to 3,600 operations/hour in AC-15 duty; 1,200 operations/hour recommended for DC-13 inductive loads to preserve contact life.
Q: Is CAD32MD compatible with TeSys D LC1D contactors?
A: Yes. CAD32MD mounts directly alongside TeSys D series contactors and shares the same accessory ecosystem including mechanical interlocks and auxiliary contact blocks.
Q: What suppression accessory is recommended for the 220V DC coil?
A: Schneider Electric LA4DE1U (diode suppressor) is the recommended accessory for DC coil circuits to limit voltage transients and protect PLC output cards.
Q: Can I get a Certificate of Conformity for customs clearance?
A: Yes. CE Declaration of Conformity and IEC 60947-5-1 test certificates are available upon request for all orders.
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