Eaton MTL SD55X 55V Low Resistance Intrinsically Safe Surge Protector with 20kA Surge Capacity

Name: Eaton MTL SD55X 55V Low Resistance Intrinsically Safe Surge Protector with 20kA Surge Capacity
Brand: Shenzhen Hengyo Power Technology Co., Limited
SKU: SD55X
Availability: InStock

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Eaton MTL SD55X 55V Low Resistance Intrinsically Safe Surge Protector with 20kA Surge Capacity

Large Image : Eaton MTL SD55X 55V Low Resistance Intrinsically Safe Surge Protector with 20kA Surge Capacity

Product Details:

Place of Origin:	India
Brand Name:	MTL
Certification:	CE
Model Number:	SD55X

Payment & Shipping Terms:

Minimum Order Quantity:	1
Price:	Negotiable
Packaging Details:	original package
Delivery Time:	ship out immediately after payment received
Payment Terms:	T/T,Western Union
Supply Ability:	500pcs/month

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Eaton MTL SD55X 55V Low Resistance Intrinsically Safe Surge Protector with 20kA Surge Capacity

Description

Condition:	Original Brand New	Warranty:	One Year
Series:	Eaton Crouse-Hinds Series	Shipping Way:	DHL FedEx Express
Application:	Automation Industries, Oil, Gas, Chemical Industries	Certificate:	CE ISO TUV
Highlight:	MTL surge protective device SD55X , surge protection device with warranty , SD55X surge protector industrial grade

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.

Overall Rating

5.0

Based on 50 reviews for this supplier

Rating Snapshot

The following is the distribution of all ratings

5 stars

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All Reviews

Antonio

Spain Mar 1.2022

Helpful (8)

everything ok

Soh

Singapore Dec 19.2019

Helpful (45)

The goods arrive very fast, so down time was shorten. Ms Michelle was very helpful in answering all my questions and concerns. She is also very efficient in getting back to me with all the answers I needed. Overall 5 STARS.

Ejiro

Nigeria Mar 6.2019

Helpful (58)

The vendor representative, Mitchell, is an awesome lady as she ensured that the order was delivered promptly to my location. Beyond that, she stood by me with all technical details to resolve issues I had on the machine. I couldn’t have had better services than this. Thank you Mitchell. Ejiro.