Technical Specifications

The K-LB-2.30 protects four signal lines in total. The device uses a non-grounded topology for optimal performance. Electrical connection occurs via screw terminals on both sides. The protected area connects to terminals 5, 6, 7, and 8. Meanwhile, the unprotected area connects to terminals 1, 2, 3, and 4. Maximum surge current reaches 20 kA with an 8/20 µs waveform. After a surge event, the K-LB-2.30 resets automatically without any intervention.

Environmental Ratings

The K-LB-2.30 operates across a wide temperature range. Ambient temperature limits span from -30°C to 80°C (-22°F to 176°F). For hazardous area usage, consult the EC-type examination certificate first. Relative humidity tolerance ranges from 5% to 95% non-condensing. The degree of protection is IP20 per IEC 60529:2013 standards. This rating protects against solid objects over 12.5 mm. However, the K-LB-2.30 is not water-resistant and needs a dry enclosure.

Physical Dimensions

The K-LB-2.30 has a compact footprint for dense cabinets. Width measures only 1.25 cm (0.5 inches). Height measures 11.5 cm (4.5 inches). Depth measures 11 cm (4.3 inches). Total weight is just 0.1 kg (0.22 lbs). Consequently, this barrier consumes minimal space on your DIN rail. Multiple units can mount side by side without issue.

Functional Safety Features

The K-LB-2.30 achieves SIL 3 rating according to IEC/EN 61508. This makes it suitable for safety instrumented systems (SIS). Use this barrier in applications up to Safety Integrity Level 3. For lower safety requirements, SIL 2 and SIL 1 are also supported. The auto-reset feature maintains system availability after surges. Therefore, the K-LB-2.30 does not require manual reset procedures. Uninterruptable operation keeps your process running safely.

Intrinsic Safety Compatibility

The K-LB-2.30 works with both intrinsically safe and non-intrinsically safe circuits. For IS circuits, it maintains the energy limitation of the system. The barrier does not add significant inductance or capacitance. Voltage rating for protected circuits is 30V maximum. Current handling depends on the specific application wiring. The K-LB-2.30 preserves the integrity of hazardous area certifications.

Installation Guidelines

Mount the K-LB-2.30 on a standard 35 mm DIN rail. Ensure the rail is properly grounded before installation. Connect the unprotected field wiring to terminals 1 through 4. The field side faces the incoming surge threat. Connect the protected control circuit to terminals 5 through 8. This side connects to your PLC, DCS, or safety system. Use a short, direct ground connection for the K-LB-2.30. Keep grounding conductors as short as possible for optimal protection.

Wiring Recommendations

Use wire sizes appropriate for your current requirements. Terminals accept solid or stranded conductors up to 2.5 mm2. Strip insulation back approximately 7 mm before insertion. Tighten terminal screws to the torque specified on the device. Maintain separation between field wiring and protected wiring. The K-LB-2.30 provides physical isolation between these sections. Label all wires clearly for future maintenance needs.

System Integration

Position the K-LB-2.30 as close as possible to the cabinet entry point. This minimizes the length of unprotected wiring inside your panel. For best results, install the barrier immediately after the cable gland. Multiple barriers can share a common ground rail. The K-LB-2.30 does not require any external power supply. It operates passively using only the signal circuit energy.

Key Benefits

The K-LB-2.30 offers several advantages for system designers. First, two-channel protection reduces the number of devices needed. Second, DIN rail mounting simplifies installation and maintenance. Third, auto-reset functionality eliminates manual intervention after surges. Fourth, the compact 1.25 cm width saves valuable panel space. Fifth, SIL 3 certification meets demanding safety requirements. Sixth, the K-LB-2.30 protects both field and control circuit inputs equally.

Package Contents

The K-LB-2.30 includes the following items in its packaging:

• Surge protection barrier (K-LB-2.30) – 1 piece

• DIN rail mounting clip (pre-installed) – 1 piece

• Product label with terminal diagram – 1 piece

• Instruction manual – 1 copy

Note: DIN rail, terminal markings, and grounding accessories are sold separately.

Common Applications

The K-LB-2.30 serves many industrial protection roles effectively. Use it for 4-20 mA loop protection in process plants. Apply it for thermocouple and RTD input protection. The K-LB-2.30 also suits digital input protection for PLC systems. For solenoid driver circuits, this barrier prevents back-EMF damage. It works well in chemical plants with hazardous area classifications. The K-LB-2.30 is also ideal for oil and gas facility installations.

Frequently Asked Questions (FAQ)

1. What is the difference between K-LB-2.30 and K-LB-1.30?
The K-LB-2.30 protects two separate channels (four signal wires). The K-LB-1.30 protects only one channel (two signal wires).

2. Can I use this barrier for RS-485 communication lines?
Yes, the K-LB-2.30 works for RS-485 at 30V or lower. However, verify your data rate does not exceed the barrier's bandwidth.

3. Does this device require a separate ground connection?
Yes, the K-LB-2.30 must connect to a low-impedance earth ground. Proper grounding is essential for effective surge protection.

4. What happens if the surge exceeds 20 kA rating?
Surges above 20 kA may damage the K-LB-2.30. The device sacrifices itself to protect downstream equipment in such cases.

5. Is the K-LB-2.30 suitable for Zone 0 hazardous areas?
Yes, when installed per the EC-type examination certificate. The K-LB-2.30 can mount in Zone 2 or safe area only.