Basler BE150BF Overcurrent Relay

The Basler BE150BF is a solid‑state overcurrent relay designed for phase protection in distribution and industrial power systems. It provides reliable overcurrent detection with adjustable pickup settings and time‑delay characteristics. This relay is part of Basler Electric's family of protective relays, known for durability and accuracy.

Key Features

The relay features a pickup current range, selectable time‑current curves, and a high reset ratio. It includes a target indicator for fault identification and test points for calibration. The relay provides time‑delayed trip outputs. Its solid‑state design ensures long‑term stability and immunity to vibration.

Technical Specifications

CT secondary rating: 5 A or 1 A. Pickup range: 0.5‑20 A (for 5 A CT). Time dial: adjustable. Time‑current curves: inverse, very inverse, extremely inverse, definite time. Output contact rating: 5 A at 250 VAC. Operating temperature: -20°C to +55°C. Auxiliary supply: 120/240 VAC or 48/125 VDC.

Operating Principles

The relay continuously monitors the current from CTs. When the current exceeds the pickup setting, the timing circuit initiates. The time delay is determined by the selected curve and time dial setting. If the fault persists, the output relay trips the breaker.

Applications

This relay is used in utility substations, industrial power systems, and commercial buildings for feeder and motor protection.

Installation and Configuration

Mount the relay in a standard panel cutout. Connect the CT leads, auxiliary power, and trip circuits. Set the pickup and time dial using the front‑panel controls. A secondary injection test is recommended.

Maintenance and Reliability

Routine maintenance includes visual inspection and periodic calibration checks. The solid‑state design provides high reliability.

Conclusion

The Basler BE150BF overcurrent relay offers dependable overcurrent protection with flexible settings, making it a versatile choice for power distribution systems.