BF1 Frequency Relay

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Documentation (Brochures & Manuals)

The relay BF1 of the BASIC LINE is equipped with an independent over- (f>) and underfrequency supervision (f<) with separate adjustable pickup values and trip delays. The measured frequency is continuously com-pared with the set reference values.

The BF1 is designed to be fastened onto a DIN-rail acc. to DIN EN 50022. (This is the case for all relays of the BASIC LINE.)

Connection BF1 (3-wire system)

Connection BF1 (4-wire system)


Parameter Range

92 … 100% fn


0 … 10 s


100 … 108% fn


0 … 10 s

Benefits and Key Features

  • Self-powered – No aux. Voltage needed

  • Easy DIN rail mounting

  • Sealable plastic covers

  • Very easy settings via buttons at the front

  • Fault indication via LED and output relays

  • Operational from −25°C to 70°C

  • For one or three phase systems

  • Frequency supervision (hysteresis 0.5% fn)


  • AC and DC Voltage based supervision devices.

  • The Basic Line devices are self-powered – Measuring voltage also supplies the device.

  • The Basic Line scope covers voltage and frequency limits as well as ROCOF and vector surge.

Inputs and Outputs
Output relays 2
Voltage transformer inputs 1
Protection ANSI
Frequency protection 810/81U
Mounting Type
Housing suitable for DIN rail mounting

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