Basler BE1-40Q Solid‑State Loss of Excitation Relay

The Basler BE1-40Q is a solid‑state relay designed to detect loss of excitation (field) in synchronous generators. It monitors the generator terminal voltage and field current, tripping when field is lost to prevent motoring and damage. The relay is essential for generator protection.

Features adjustable settings and a front‑panel display. Suitable for utility and industrial generators.

Technical Specifications

• Model: BE1-40Q

• Protection: Loss of excitation

• Voltage sensing: 3‑phase, 0‑600 V AC

• Field current input: 0‑10 A

• Pickup settings: Adjustable

• Time delay: 0.1‑30 s

• Output: 2 form C contacts

• Power supply: 24‑240 V AC/DC

• Operating temperature: -40°C to +70°C

• Certifications: CE, UL, RoHS

Functional Features

• Loss of field detection: Prevents generator motoring.

• Adjustable settings: Match generator characteristics.

• Reliable solid‑state design.

Typical Applications

• Steam, gas, and hydro generators.

• Industrial generators.

Installation

Panel mount, connect PTs, field current sensor, and power.

Conclusion

The BE1-40Q provides essential loss‑of‑excitation protection for generators.