Eaton MTL SD55X 55V Low Resistance Intrinsically Safe Surge Protector with 20kA Surge Capacity
Price:
Negotiable
MOQ:
1
Delivery Time:
ship out immediately after payment received
Brand:
MTL
Product Description
MTL SD55X Surge Protector | 55V Low Resistance Intrinsically Safe SPD
The Eaton MTL SD55X is a high-performance surge protection device (SPD) from the industry-leading MTL SD range. Engineered specifically for 55V DC / 38V AC applications, this module provides robust protection against transient overvoltages caused by lightning strikes and switching events. With its ultra-slim DIN rail design, low series resistance (2.2Ω), and ATEX intrinsic safety certification, the SD55X is the ideal choice for safeguarding critical process instrumentation, including 4-20mA loops, thermocouples, emergency shutdown (ESD) systems, and fire & gas detectors.
Why the MTL SD55X Stands Out
Unlike general-purpose protectors, the SD55X is purpose-built for industrial signal lines where signal integrity is paramount. Its low-resistance design ensures minimal impact on loop-powered devices, while the hybrid multi-stage suppression circuitry provides fail-safe protection without degrading your process measurements.
Key Features & Benefits
- ATEX Intrinsically Safe (IS) Certified: Certified for use in hazardous area applications (Ex ia), allowing direct installation into potentially explosive atmospheres without additional barriers.
- Ultra-Slim Footprint (12.5mm): The space-saving design maximizes cabinet density, allowing you to protect more channels per DIN rail. Modules can "double-up" as feedback terminals to reduce wiring complexity.
- Exceptional Surge Capacity (20kA): Handles maximum surge current of 20kA (8/20µs) and nominal discharge current of 3kA, providing reliable protection against direct and indirect lightning strikes.
- Low Series Resistance (2.2 Ω per line): Unlike standard SD55 models (4.2Ω), the SD55X variant offers significantly lower resistance, making it the preferred choice for low-power loops where voltage drop must be minimized.
- Fast Response Time (<1ns): Responds to transients in under 1 nanosecond, clamping overvoltages before they can damage sensitive PLC, DCS, or SIS I/O cards.
- High Current Handling (400mA): Supports nominal current up to 400mA, suitable for a wide range of loop-powered and separately powered field devices.
- HART Transparent: The 25kHz bandwidth ensures seamless compatibility with HART communication protocols, allowing digital signals to pass without attenuation.
- 10-Year Product Warranty: Backed by Eaton MTL's industry-leading warranty for long-term reliability and peace of mind.
Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Eaton (MTL) |
| Model | SD55X |
| Part Number | SD55X |
| Nominal Voltage (Un) | 55 V DC / 38 V AC |
| Max Continuous Voltage (Uc / MCOV) | 62 V |
| Nominal Current (In) | 400 mA |
| Series Resistance | 2.2 Ω per line (Low Resistance variant) |
| Max Leakage Current | 5 µA |
| Voltage Protection Level (Up) | < 90 V @ 1 kV/µs |
| Residual Voltage @ Isn | 100 V |
| Max Surge Current (Imax) | 20 kA (8/20 µs) |
| Nominal Discharge Current (Isn) | 3 kA (8/20 µs) |
| Response Time | < 1 ns |
| Bandwidth | 25 kHz |
| Mounting | 35 mm DIN Rail (top hat rail) |
| Operating Temperature | -40°C to +80°C |
| Certifications | ATEX (Ex ia), IECEx (pending region) |
| Warranty | 10 years |
Applications
- Process Industries: Protection of 4-20mA analog input/output cards in PLC, DCS, and SIS systems.
- Oil & Gas: Thermocouple and RTD temperature measurements, fire & gas detection systems.
- Chemical & Pharmaceutical: Emergency shutdown (ESD) systems and solenoid valve control circuits.
- Power Generation: Vibration monitoring sensors (with SD32T3 for 3-wire applications).
SD55X vs. SD55: Which One Do You Need?
The SD55X is the low-resistance variant (2.2Ω) of the standard SD55 (4.2Ω). Choose the SD55X when:
- You need to minimize voltage drop in loop-powered 4-20mA circuits.
- Your application requires higher current handling (400mA vs 250mA).
- You do NOT need the fuse-disconnect feature (the SD55 includes a fuse for loop isolation).
Why Choose the MTL SD55X?
The MTL SD range is globally recognized as the gold standard for signal line surge protection. With its hybrid circuit design, ultra-high packing density, and ATEX certification, the SD55X delivers uncompromising protection without compromising signal integrity. Whether you are upgrading an existing control system or designing a new greenfield facility, the SD55X provides the reliability and performance required for critical safety and process applications.
Technical Data Sheet
| Attribute | Value |
|---|---|
| Product Type | Surge Protective Device (SPD) |
| Brand | Eaton (MTL / MTL Instruments) |
| Model | SD55X |
| Category | Type 2 / Type 1 (DIN rail) |
| Nominal Voltage DC | 55 V |
| Nominal Voltage AC | 38 V |
| Max Continuous Voltage (Uc) | 62 V |
| Nominal Current | 400 mA |
| Series Resistance | 2.2 Ω/line |
| Max Surge Current (8/20 µs) | 20 kA |
| Nominal Discharge Current (8/20 µs) | 3 kA |
| Response Time | < 1 ns |
| Bandwidth | 25 kHz |
| Mounting | DIN Rail (35 mm) |
| Degree of Protection | IP20 |
| Operating Temperature | -40°C to +80°C |
| Certifications | ATEX, IECEx |
| Warranty | 10 years |
Competitor Comparison
| Feature | MTL SD55X | Pepperl+Fuchs K-LB-2.30 |
|---|---|---|
| Voltage (Uc) | 62V | 30V |
| Current | 400mA | 250mA |
| Resistance | 2.2Ω | 0.5Ω |
| Bandwidth | 25kHz | Higher (for HART) |
| Best For | Higher voltage loops, ATEX | Low voltage precision loops |
Google Shopping Tips
- Negative Keywords: Exclude "SD55" (non-X variant) if you only stock the X version, or clarify the difference in your listing.
- Use Case Keywords: Target industrial hubs with terms like ESD system protection, thermocouple surge protector, fire and gas detector SPD.
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Company
Shenzhen Hengyo Power Technology Co., Limited
Location
Room 2407, B Block No.145 Chengshi Zhuchang Bld, Bagua 2nd Rd, Futian Dist. Shenzhen City, China 518029
Contact Person
Vivian Chan