Surge Protection Barrier FN-LB-I

Industrial-grade protection for hazardous areas. SIL 3 certified barrier with ½ NPT mounting. Shields equipment from lightning strikes and power surges.

Key Features

• SIL 3 safety rating (IEC/EN 61508)
• Handles 20kA surge currents (8/20 µs)
• Explosion-proof ATEX/CSA certified
• Stainless steel housing (IP67 rated)
• 500V isolation protection

Technical Specifications

• Brand: Pepperl+Fuchs
• Model: FN-LB-I (Field Mount)
• Channels: 1-channel
• Surge Current: 20 kA (8/20 µs)
• Voltage Range: ≤48V DC
• Current Range: ≤250mA
• Isolation: 500V from earth
• Temp Range: -30°C to 60°C
• Response Time: 1ns (sym), 100ns (asym)
• Connection: ½ NPT thread

Installation Guide

Mount using ½ NPT thread. Ensure proper grounding. Maintain 500V isolation from earth. Suitable for vertical/horizontal installation in Zone 1/2 hazardous areas.

Compatibility

Works with 4-20mA signals, sensor circuits (≤48V), and SIL 3 safety systems. Compatible with ATEX (II 2G EEx ia IIC T6), IECEx, and CSA standards.

What's Included

• 1 × FN-LB-I barrier
• 1 × 0.3m connection cable
• Installation manual
• 12-month warranty

Shipping Options

FedEx | UPS | DHL
Delivery: 3-5 business days worldwide

Real-World Applications

• Oil Refineries: Protecting gas detectors from lightning surges
• Chemical Plants: Shielding flow transmitters in Zone 1 areas
• Power Stations: Safeguarding control systems in SIL 3 environments

FAQ

Q: Is this suitable for 24V PLC systems?
A: Yes, rated for ≤48V systems.

Q: What's the difference between FN-LB-I and FS-LB-I?
A: FN-LB-I uses ½ NPT thread while FS-LB-I has M20 threading. Both offer 20kA protection.

Q: Is grounding required?
A: Critical for 500V isolation protection.

Model Comparison