The Furse ESP SL15X and ESP SL30X surge protective devices provide intrinsically safe overvoltage protection for data, signal, and communication loops operating in hazardous areas. Certified to ATEX and IEC standards, these units safeguard sensitive instrumentation circuits against lightning electromagnetic pulses without compromising explosion safety.
Field instruments deployed in explosive atmospheres face continuous risks from lightning electromagnetic pulses and switching transients induced across long signal lines. When high-energy surges propagate into Zone 1 or Zone 2 locations, they can generate high voltages or thermal arcs that threaten hazardous area integrity. The Furse ESP SL15X and ESP SL30X surge protective devices are engineered specifically to mitigate these threats by safely diverting transient currents to earth while maintaining strict electrical isolation. Approved for use under rigorous ATEX and IEC frameworks, these protectors integrate multi-stage hybrid protection circuitry, combining fast-acting semiconductor components with heavy-duty gas discharge tubes. This design ensures that let-through voltages remain exceptionally low, protecting delicate electronic front-ends in industrial transmitters, flow meters, and serial communication interfaces against catastrophic breakdown.
Technical Specifications
Nominal Voltage: 15 V @ ESP SL15X
Nominal Voltage: 30 V @ ESP SL30X
Maximum Working Voltage Uc: 16.7 VDC @ ESP SL15X
Maximum Working Voltage Uc: 36.7 VDC @ ESP SL30X
Current Rating: 750 mA @ Signal Loop
In-Line Resistance: 1.0 Ω @ Per Line ± 10%
Bandwidth: 45 MHz @ -3 dB 50 Ω System
Max Discharge Current: 20 kA @ 8 / 20 μs Waveform
Let-Through Voltage Up: 63 V @ 1 kV / μs Test
Ambient Temperature Range: -40°C - +80°C @ Operational
Mounting Type: Top Hat DIN Rail @ 35 mm
ABB Order Code: 7TCA085400R0065 @ ESP SL15X
ABB Order Code: 7TCA085400R0071 @ ESP SL30X
System Integration and Hardware Setup
Proper installation of the ESP SL15X and ESP SL30X units requires careful attention to cabinet layout and grounding continuity within hazardous area infrastructure. Installers must mount the protector on standard 35 mm top hat DIN rails as close as possible to the protected equipment or at the boundary where signal cables enter the control enclosure. The integrated DIN rail foot provides a secure mechanical lock and establishes low-impedance earthing connectivity. Wiring terminals accommodate conductors up to 4 mm², allowing secure termination of stranded wires with ferrules or dual-wire configurations. Shielded twisted pair cables should have their outer screens properly bonded to designated earth terminals or isolated screen bases (such as the /I variant options) to prevent ground loops and reject electromagnetic interference effectively.
Reliability and Environmental Durability
Designed for harsh industrial environments, these surge protection modules deliver high operational reliability and long service intervals under extreme conditions. The compact Slim Line housing optimizes DIN rail space inside congested explosion-proof control panels without sacrificing thermal dissipation capacity. The plug-in modular architecture separates the electronics module from the base, allowing maintenance personnel to replace plug-in elements safely. Corrosion-resistant terminal blocks and robust internal components ensure stable performance across wide temperature fluctuations and high humidity levels typical of outdoor petrochemical installations and offshore platforms.
Selection Guidance and Alternative Options
Selecting the correct model depends on the operating voltage of the loop and specific hazardous area classification requirements. The ESP SL15X (7TCA085400R0065) suits 15 V circuits, whereas the ESP SL30X (7TCA085400R0071) matches 30 V instrumentation loops such as standard 4-20 mA current loops with HART communication. For applications requiring visual status indication, LED-integrated variants like the ESP SL15XL and ESP SL30XL provide immediate operational feedback. When sourcing these specialized components, Beijing Zhongping Technology maintains reliable regional channels to assist engineers with cross-reference selection, technical documentation, and authentic factory-original fulfillment.
Frequently Asked Questions (FAQ)
1. What is the primary difference between the ESP SL15X and ESP SL30X models?
The ESP SL15X is rated for 15 V nominal systems with a maximum working voltage of 16.7 VDC, while the ESP SL30X is rated for 30 V nominal systems with a maximum working voltage of 36.7 VDC.
2. Are these units certified for use in explosive atmospheres?
Yes, both models are intrinsically safe and approved for hazardous areas in compliance with ATEX and IEC standards.
3. Can maintenance technicians replace the protection module without rewiring?
Yes, the plug-in design allows the upper protection module to be replaced from the base without disconnecting field wiring or disturbing earth connections.
4. What is the maximum continuous current rating for these signal protectors?
Both units support a maximum signal current rating of 750 mA.
5. How does the in-line resistance affect loop measurement accuracy?
The low in-line resistance of 1.0 Ω per line introduces minimal voltage drop, ensuring measurement integrity remains unaffected in analog and digital loops.
6. What is the bandwidth capability of these surge protective devices?
The units offer a -3 dB bandwidth of 45 MHz in a 50 Ω system, making them suitable for high-speed data transmission applications.
7. How are the devices grounded during installation?
Earthing is achieved conveniently through the integrated DIN rail foot clamping mechanism or via dedicated earth terminals linked to the system reference point.
8. What wire size is supported by the terminal blocks?
The terminals accept conductor cross-sections up to 4 mm², accommodating solid or stranded wires with ferrules.
9. What is the lead time and warranty coverage when ordering through Beijing Zhongping Technology?
Beijing Zhongping Technology provides authentic original factory units backed by a standard 12-month quality warranty and responsive local technical support.
10. Are replacement bases available if the terminal mounting base sustains damage?
Yes, replacement bases such as the ESP SLX/B and isolated screen variants are available for maintenance replacement.
FAQ
1.Who are We?
Beijing Zhongping Technology Co., LTD., is a global industrial electrical automation service provider, is a scientific research, design, marketing, technical services, industrial Internet, international import and export services as one of the science and technology companies.
2.What can you buy from us?
PLC, inverter, human-machine interface, hydraulic products, low-voltage power distribution, industrial robots and core components
3.Is the item in stock or need to be purchased from another supplier?
We have a large inventory of goods and have our own warehouse.
4.What advantages do we have over other suppliers?
Our company has a large amount of inventory and a number of warehouses, but also in the country's important industrial provinces and cities with offices and a number of overseas service points. To provide you with intelligent manufacturing one-stop comprehensive services, save efforts, labor and cost.
5.Can you provide 100% new original authentic products?
We only sell new original genuine, no renovation, no fake, only for the original factory original!
6.How long is the delivery time?
If there is a stock, it will take 2-3 working days to ship, if the quantity is large, it will take 5-7 working days after receiving the payment, if it is not a conventional model, it will take some time, we will inform you of the specific delivery time.
7.Is there technical support available?
Of course, we have a professional technical team that can help you solve technical problems.
8.How do we guarantee quality?
We have three processes to control the quality of goods.
1) Our engineers will inspect the production and quality control in the factory regularly.
2) Incoming materials shall be inspected by experienced purchasing engineers before they can be stored.
3) At least 2 people in the logistics department cross-check the goods to be sent before delivery.
9.Can you guarantee the safe and reliable delivery of your products?
Yes, we strictly adopt the international standard packing. We also use special packaging for dangerous goods, and refrigerated shipping for items with temperature requirements. Special item packaging and general cargo standard packaging requirements may incur additional costs.
10.How about the freight?
The cost depends on how you choose to get the goods. Express is usually the fastest but also the most expensive way. Sea freight is the best solution for large quantities of goods. The exact shipping cost depends on the purchase amount、quantity and weight of your order. Please feel free to contact us for more information.
+86 010-64225983
+8613811814778
Building 26, Liyuan Community, Chaoyang District, Beijing, China
