Pepperl+Fuchs K-LB-1.30G Surge Protection Barrier for SIL 3 Applications

Product Overview

The Pepperl+Fuchs K-LB-1.30G surge protection barrier provides robust defense for sensitive field and control circuit inputs. This single-channel device diverts dangerous transients caused by lightning or switching operations directly to earth. It ensures continuous signal loop integrity during overvoltage events. The unit remains fully HART transparent for seamless system integration. Its compact design facilitates efficient mounting on standard 35 mm DIN rails.

Core Technical Specifications

• Brand: Pepperl+Fuchs
• Model: K-LB-1.30G
• Series: K-System Surge Protection
• Safety Integrity Level: SIL 3 (acc. to IEC/EN 61508)
• Nominal Operating Voltage: 24 V DC
• Max. Continuous Voltage: 30 V DC
• Rated Current: 250 mA
• Series Resistance: < 0.5 Ω per line
• Surge Discharge Capacity: 20 kA (8/20 µs) total
• Impulse Rating: 10 kV/5 kA (Category C2)
• Frequency Response: Insertion loss ≤ 0.05 dB (0 to 4 kHz)
• Operating Temperature: -30 °C to 80 °C
• Environmental Protection: IP20 rated housing
• Connection Type: Screw terminals (up to 2.5 mm²)

Installation and Maintenance

• Install the K-LB-1.30G indoors on a 35 mm DIN mounting rail.
• Ensure the device shares a common potential with protected equipment.
• Use high-quality ground connections for optimal surge diversion.
• The device features an auto-reset function for uninterruptable operation.
• Front-side labeling space allows for clear identification in high-density cabinets.
• Maintenance is minimal due to the solid-state design and self-resetting capabilities.

Compatibility and Certifications

• Compatible with standard 30 V DC signal loops.
• Suitable for hazardous area applications (Ex ia IIC T6/T5/T4).
• ATEX Certification: PTB 00 ATEX 2176 X.
• IECEx Approval: IECEx BAS 14.0010X.
• CSA Approved for hazardous locations.
• Complies with EN 61643-21 standards for low-voltage surge protection.

Typical Application Scenarios

• Protecting 4-20 mA analog input/output loops.
• Safeguarding digital inputs in control systems.
• Defending HART-enabled field instrumentation.
• Critical safety-instrumented systems (SIS) requiring SIL 3 ratings.

Logistics and Support

• Package Contents: 1 x K-LB-1.30G module, user documentation.
• Shipping Partners: FedEx, UPS, and DHL.
• Dispatch Time: All orders processed within 24-48 hours.
• Warranty: 12-month quality guarantee on all units.

Frequently Asked Questions

Q: Does the K-LB-1.30G require manual resetting after a surge?
A: No. The device features an auto-reset capability, ensuring uninterruptable operation without manual intervention.

Q: Can I use this barrier in an explosive atmosphere?
A: Yes, it is rated for hazardous areas (Ex ia IIC), provided you adhere to the relevant EC-type examination certificates.

Q: Is this device suitable for HART communication?
A: Yes, the design is fully HART transparent, allowing digital signals to pass through without signal degradation.

Global PLC Spare HUB's Insight

The Pepperl+Fuchs K-LB-1.30G is a benchmark in industrial surge protection. In our experience at Global PLC Spare HUB, this module excels in environments where downtime is not an option. It is best suited for chemical processing plants, oil and gas skids, and automated manufacturing lines where precision instrumentation must be shielded from electrical noise and transient surges. Its ability to maintain SIL 3 compliance while remaining HART transparent makes it an essential component for engineers prioritizing both safety and operational efficiency.