LB4105A2-254726

Product Description

It operates on a universal supply voltage of 20 to 230 V AC/DC, making it suitable for a wide range of industrial applications. The device features two relay outputs with changeover contacts, each rated for 5 A at 250 V AC, providing reliable switching for pumps, valves, and alarm systems. Its housing is designed for DIN rail mounting (35 mm) and has an IP40 protection rating, ensuring durability in control cabinets. This level relay works on the principle of conductivity measurement, using two or three electrodes to detect liquid levels. It offers adjustable sensitivity from 5 kΩ to 100 kΩ, allowing adaptation to different liquid conductivities. The LB4105A2 includes a built-in hysteresis function to prevent relay chatter at the switching point, and it provides both fill and empty control modes, selectable via a front-panel switch. The device also features LED indicators for power supply and relay status, enabling easy diagnostics. The LB4105A2 is part of Pepperl+Fuchs' LB series of level control relays, known for their robustness and precision. It is commonly used in water treatment plants, chemical processing, and food and beverage industries for tasks such as tank level control, pump protection, and overflow prevention. With its wide supply voltage range and adjustable sensitivity, this relay offers flexibility and reliability in demanding environments. The product is manufactured to high-quality standards and is CE-marked, ensuring compliance with European directives. The Pepperl+Fuchs LB4105A2 is a compact level control relay designed for conductive liquid level monitoring and control.

Basic Product Information

• 2 relay outputs with changeover contacts (5 A / 250 V AC)
• Adjustable sensitivity 5-100 kΩ for various liquid conductivities
• Fill and empty control modes selectable via front switch
• Built-in hysteresis to prevent relay chatter
• LED indicators for power and relay status
• Compact DIN rail mount housing (35 mm)
• IP40 protection rating for control cabinet use
• Universal supply voltage 20-230 V AC/DC

Technical Specifications

Version & Model Difference

The LB4105A2 is part of the LB series. Compared to the LB4105A1 (which has a fixed sensitivity of 50 kΩ), the A2 version offers adjustable sensitivity (5-100 kΩ) for greater flexibility. The LB4105A2 also features a wider supply voltage range (20-230 V AC/DC) compared to older models that were limited to 24 V DC or 115/230 V AC. The A2 version includes both fill and empty modes, while some earlier models had only one mode. The housing design is consistent across the series, but the A2 has improved LED indicators for better status visibility.

Application Scenarios

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