Product Overview

The Pepperl+Fuchs K-LB-1.30 is a single-channel surge protection barrier. It belongs to the K-System of interface devices. This barrier protects field and control circuit inputs. You can use the K-LB-1.30 for intrinsically safe or non-intrinsically safe 30V applications. It mounts on a 35 mm DIN rail. The device limits transients from lightning or switching operations. Industrial users trust this barrier for SIL 3 safety systems.

Technical Specifications

The K-LB-1.30 delivers robust surge protection with auto-reset functionality. Below are the core technical details.

General Specifications:

• Number of Protected Signal Lines: 2 lines.

• Topology: Non-grounded.

• Number of Channels: 1 channel.

• Mounting: 35 mm DIN rail (EN 60715).

• HART Transparency: Yes (does not affect HART communication).

Electrical Specifications:

• Connection (Protected Area): Terminals 7, 8.

• Connection (Unprotected Area): Terminals 1, 2.

• Rated Current (Ir): 250 mA.

• Leakage Current: < 5 µA at 24V and 25°C (line-line).

• Nominal Voltage: 24 V DC.

• Maximum Continuous Operating Voltage (Uc): 30 V DC.

• Series Resistance: < 0.5 Ω per line.

Surge Ratings & Performance

The K-LB-1.30 handles very high surge currents. It resets automatically after each event.

Discharge Current Ratings:

• Impulse Discharge Current (10/350 µs) Iimp: 2 kA per line (2x).

• Nominal Discharge Current (8/20 µs) In: 5 kA per line (10x).

• Rated Surge Current (8/20 µs) ISM: 10 kA per line (1x).

• Total Discharge Current (8/20 µs) Itotal: 20 kA (1x).

Impulse Ratings:

• 10 kV / 5 kA (Category C2).

• 2 kV / 2 kA (Category D1).

Voltage Protection Level (Up):

• Line-Line: Max 75 V at nominal discharge current In.

• Line-Earth: Max 1.2 kV at nominal discharge current In.

Other Performance:

• Impulse Reset Time: < 30 ms (uninterruptable operation).

• Insertion Loss: ≤ 0.05 dB at 0-4 kHz (600Ω system) / ≤ 3 dB at 0-174 kHz (100Ω system).

Functional Safety Certification

The K-LB-1.30 meets high safety integrity requirements.

• Safety Integrity Level (SIL): SIL 3 acc. to IEC/EN 61508.

• Uninterruptable Operation: Auto reset after surge.

Hazardous Area Approvals

The K-LB-1.30 is approved for use in explosive atmospheres.

ATEX Approval:

• EU-type Examination Certificate: PTB 00 ATEX 2176 X.

• Marking: II 2(1)G Ex ia IIC T6/T5/T4.

• Temperature Class T6: Ambient temperature ≤ 50°C.

• Temperature Class T5: Ambient temperature ≤ 70°C.

• Temperature Class T4: Ambient temperature ≤ 80°C.

IECEx Approval:

• IECEx Certificate: IECEx BAS 14.0010X.

Dust Approval:

• Certificate: PF 16 CERT 4065 X.

• Marking: II (3)D [Ex ic Dc] IIIC.

CSA Approval:

• Control Drawing: 116-0187 (cCSAus).

Hazardous Area Electrical Data

For installations in explosive atmospheres, use these values.

• Voltage Ui: 30 V.

• Current Ii: 250 mA.

• Internal Capacitance Ci: Negligible.

• Internal Inductance Li: 200 µH.

Environmental Specifications

The K-LB-1.30 operates in a wide range of conditions.

• Ambient Temperature: -30 to 80 °C (-22 to 176 °F).

• Relative Humidity: 5 to 95%.

• Mounting Location: Indoor only.

• Degree of Protection: IP20.

Mechanical Specifications

• Connection: Screw terminals.

• Core Cross Section: 2 x 2.5 mm².

• Mass: Approx 100 g (0.1 kg).

• Dimensions (W x H x D): 12.5 mm x 115 mm x 116 mm (0.5 in x 4.5 in x 4.6 in).

• Mounting: 35 mm DIN rail acc. to EN 60715.

Standards Compliance

The K-LB-1.30 meets international standards.

• Degree of Protection: IEC 60529:2013.

• Surge Protective Devices: EN 61643-21:2001+A1:2009+A2:2013 / IEC 61643-21:2001+A1:2008+A2:2012.

• ATEX Directive: EN 60079-0:2012+A11:2013, EN 60079-11:2012.

Installation Guidelines

Install the K-LB-1.30 on a 35 mm DIN rail (EN 60715). Always connect the device to a high-quality ground connection. The barrier must have the same potential as the devices it protects. Install the ground system according to local regulations. Connect the unprotected field side to terminals 1 and 2. Connect the protected control side to terminals 7 and 8. Do not exceed 30V DC continuous operation. The K-LB-1.30 protects both signal lines. For hazardous area use, observe the EC-type examination certificate.

What is in the Box

Please inspect all items upon delivery.

• Pepperl+Fuchs K-LB-1.30 surge protection barrier.

• Labeling space sticker for front marking.

• Installation quick start guide.

Frequently Asked Questions (FAQ)

1. Is the K-LB-1.30 suitable for 4-20 mA loops?
Yes. The K-LB-1.30 has less than 0.5Ω series resistance. The leakage current is below 5 µA. This does not affect 4-20 mA signal accuracy.

2. What happens after a surge event?
The K-LB-1.30 resets automatically in less than 30 ms. There is no manual reset required. The device continues normal operation.

3. Can I use this barrier outdoors?
No. The K-LB-1.30 has an IP20 rating for indoor mounting only. You must place it inside a weatherproof enclosure for any outdoor installation.

4. Does this device work with HART communicators?
Yes. The K-LB-1.30 is HART transparent. It does not introduce insertion loss that would block HART frequencies (typically 1-2 kHz).

5. What is the difference between the K-LB-1.30 and a standard fuse?
A fuse blows and must be replaced. The K-LB-1.30 clamps the voltage and diverts current. It resets automatically. This provides uninterrupted protection.