Product Overview

The K-LB-2.6G is a surge protection barrier from Pepperl+Fuchs. To begin with, this device has 2 channels for protecting multiple circuits. It mounts on a standard DIN rail for easy installation.

The barrier works for 6 V intrinsic safety (IS) or non-IS applications. Specifically, it protects both field and control circuit inputs. Consequently, the K-LB-2.6G limits induced transients from lightning strikes and switching impulses.

Operating Principle

The K-LB-2.6G limits transients by diverting current to ground. At the same time, it clamps the signal line voltage to a safe level. This protection lasts only for the duration of the surge.

Moreover, the barrier provides low line-to-line and line-to-ground clamping voltage. As a result, it protects instruments with less than 500 V isolation-to-ground. For example, it safeguards Zener Barriers, standard I/O cards, and field instruments.

Connections and Supply Ratings

The K-LB-2.6G protected area connects through terminals 5, 6 and 7, 8. The unprotected area connects through terminals 1, 2 and 3, 4.

The rated voltage (Un) is ≤6 V. The rated current (In) is ≤250 mA. Furthermore, the leakage current is ≤5 µA. The on-state voltage is ≤12 V. Therefore, the K-LB-2.6G operates with very low signal interference.

Electrical Specifications

Nominal Discharge Current
The nominal discharge current (8/20) is 10 kA per core. In addition, it is 5 kA per core for 10x operations.

Maximum Surge Current
The maximum surge current (8/20) is 20 kA per core. It is also 10 kA per core for 1x operation.

Response Time and Resistance
The symmetrical nominal response time is 1 ns. In contrast, the asymmetric response time is 100 ns. The series resistance is ≤0.3 Ω per conductor. The bandwidth is ≥40 kHz. Thus, the K-LB-2.6G responds extremely quickly to surge events.

Ambient and Mechanical Specifications

Temperature Range
The K-LB-2.6G operates at ambient temperatures from -30°C to 80°C (-22°F to 176°F). However, for Ex applications, please observe the EC-Type Examination Certificate.

Physical Dimensions
The degree of protection is IP20. The mass is approximately 100 g. The dimensions are 12.5 mm x 114 mm x 110 mm. This equals 0.5 x 4.5 x 4.3 inches. Consequently, the K-LB-2.6G fits easily into crowded control cabinets.

Ex-Data and Certifications

ATEX Certification
The K-LB-2.6G EC-Type Examination Certificate is PTB 00 ATEX 2176X. The group, category, and type of protection is II 2(1)G Ex ia IIC T6.

Temperature Classes
T6 temperature class applies for ambient temperature ≤50°C. T5 applies for ambient temperature ≤70°C. T4 applies for ambient temperature ≤80°C.

Electrical Limits for Ex
The voltage (Ui) is 6 V. The current (Ii) is 250 mA.

Additional Approvals
The K-LB-2.6G also carries CSA approval with control drawing 116-0187 (cCSAus). Additionally, IECEx approval is IECEx BAS 14.0010X.

Directive Compliance

The K-LB-2.6G complies with Directive 94/9/EC. The specific standards include EN 60079-0:2012+A11:2013 and EN 60079-11:2012. Therefore, this barrier meets stringent European safety requirements for explosive atmospheres.

Important Installation Notes

Surge protection barriers must connect to a solid and effective ground. Furthermore, they must stay at the same equipotential level as the protected instrument.

The ground system must comply with all applicable regulations. The K-LB-2.6G provides uninterrupted operation with auto-reset functionality. Consequently, the protected system continues normal operation after a surge event.

Installation Guidelines

Mechanical Mounting
First, mount the K-LB-2.6G on a standard 35 mm DIN rail. Ensure the rail is securely attached to the panel.

Wiring Connections
Next, connect the protected instrument to terminals 5,6 and 7,8. Then, connect the field wiring to terminals 1,2 and 3,4.

Grounding
After that, connect the ground terminal to a solid earth ground. Use short, direct grounding conductors for best performance. Keep the ground connection as low impedance as possible.

Final Checks
Do not share the ground wire with high-power equipment. Furthermore, maintain equal equipotential bonding with protected instruments. Finally, verify all connections are tight before applying power.

Package List

• 1 x Pepperl+Fuchs K-LB-2.6G Surge Protection Barrier

• 1 x DIN rail mounting clip (pre-installed)

• 1 x Product information sheet

Frequently Asked Questions (FAQ)

Q1: What is the maximum surge current the K-LB-2.6G can handle?
The maximum surge current is 20 kA per core (8/20 waveform). Therefore, the K-LB-2.6G provides robust protection for severe lightning strikes.

Q2: Can this barrier be used in hazardous areas?
Yes, the unit has ATEX, CSA, and IECEx approvals. Specifically, the K-LB-2.6G is rated Ex ia IIC T6 with appropriate ambient temperature limits.

Q3: What is the difference between symmetrical and asymmetric response time?
Symmetrical response is 1 ns for common mode surges. Asymmetric response is 100 ns for differential mode surges on the K-LB-2.6G.

Q4: Does the barrier need external power to operate?
No, the K-LB-2.6G is passive. It does not require any external power supply for operation.

Q5: What happens to the barrier after a surge event?
The device automatically resets after the surge passes. Consequently, the K-LB-2.6G provides uninterrupted protection without manual intervention.