Eaton SD32MXL-BCN DIN Rail Mount Surge Protection Device 32V DC with 20kA Surge Current Capacity and ATEX IECEx Certification
The SD32MXL-BCN is a high-performance modular surge protection device (SPD) from Eaton's MTL SD Modular range, designed to safeguard sensitive signal and process I/O equipment from damaging voltage transients and lightning-induced surges on control loop cabling.
Featuring a plug-and-base modular design, this SPD combines a base unit with screw terminals and a replaceable surge protection plug, enabling quick maintenance without disconnecting field wiring or interrupting system operation. With a surge current capacity of 20kA and an operating voltage of 32V, the SD32MXL-BCN is specifically optimized for 4-20mA signal loops and other process control applications.
Certified with ATEX and IECEx approvals for hazardous area installations, this device delivers robust protection for industrial automation systems in harsh and potentially explosive environments.
| Code Segment | Meaning |
|---|---|
| SD | Surge Protection Device (SPD) |
| 32 | Maximum continuous operating voltage — 32V |
| MXL | Modular design with extra-low loop resistance for high-performance signal integrity |
| BCN | Configuration variant — Base with screw terminals, Certified version (hazardous area approved) |
"BCN" suffix indicates full hazardous area certification (ATEX/IECEx) and compatibility with standard industrial wiring.
- 20kA Surge Current Capacity: Handles maximum surge currents of 20kA (8/20μs waveform), providing robust protection against lightning strikes and power grid switching transients
- Modular Plug-and-Base Design: The base installs permanently with screw terminals, while the surge protection plug is easily replaceable — no need to disconnect field wiring or interrupt the control loop during maintenance
- ATEX and IECEx Certified: Intrinsically safe for use in potentially explosive atmospheres (Zone 0, 1, 2), making it suitable for oil & gas, chemical, and pharmaceutical facilities
- Optimized for 4-20mA Loops: Specifically engineered for process I/O applications, supporting 2-wire, 3-wire, and 4-wire transmitters with negligible signal degradation
- Ultra-Slim Form Factor: The compact modular design saves valuable panel space in crowded electrical enclosures
- Multi-Stage Hybrid Protection: Advanced circuitry combining gas discharge tube (GDT) and solid-state components for fast response and reliable clamping
- 10-Year Warranty: Backed by Eaton's industry-leading "No Fuss" warranty, ensuring long-term reliability
| Parameter | Value |
|---|---|
| Manufacturer | Eaton (MTL Instruments Group) |
| Series | MTL SD Modular Range |
| Product Model | SD32MXL-BCN |
| Max. Continuous Operating Voltage (Uc) | 32V DC |
| Maximum Surge Current (8/20 μs) | 20kA |
| Nominal Discharge Current (8/20 μs) | 3kA (typical for MTL SD series) |
| SPD Type | Type 1 / Type 2 (suitable for service entrance and distribution panels) |
| Protection Technology | Multi-stage hybrid (GDT + solid-state) |
| Loop Resistance | Extra-low (MXL design — minimal signal interference) |
| Bandwidth | Compatible with 4-20mA and HART communication protocols |
| Terminal Type | Screw terminals (base unit) |
| Mounting | DIN rail (standard top-hat rail 35mm) |
| Dimensions (Width) | 8mm (ultra-slim single channel) |
| Weight | Approx. 67g (plug + base) |
| Operating Temperature | -40°C to +80°C |
| Storage Temperature | -40°C to +80°C |
| Certifications | ATEX, IECEx, UL-BR19.0285X (Brazil InMetro) |
| Warranty | 10 years |
| Country of Origin | India |
The SD32MXL-BCN is specifically designed to protect critical process instrumentation in demanding environments:
| Industry | Application |
|---|---|
| Oil & Gas | Offshore platforms, refineries, pipelines — protects pressure/temperature transmitters and flow meters |
| Chemical Processing | Reactor monitoring, hazardous area instrumentation requiring ATEX certification |
| Pharmaceutical | Sterile processing, clean room equipment in potentially explosive atmospheres |
| Power Generation | Steam/gas turbine monitoring, boiler control systems, SCADA communications |
| Water/Wastewater | Pump station instrumentation, treatment plant sensors, remote telemetry units (RTUs) |
| Industrial Automation | PLCs, DCS systems, remote I/O, and fieldbus networks with 4-20mA signal loops |
Suitable for protecting 2-wire, 3-wire, and 4-wire transmitters measuring pressure, temperature, level, flow, and pH.
| Certification | Status |
|---|---|
| ATEX | ✅ Certified for hazardous area installations |
| IECEx | ✅ International certification |
| UL-BR (InMetro) | ✅ Certificate UL-BR19.0285X (valid until 2028) |
| Functional Safety | ✅ Suitable for use in SIL-rated loops per IEC 61508/61511 |
| RoHS | ✅ Compliant |
| REACH | ✅ Compliant |
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