BU1AC Voltage Relay (BU1AC400)
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Configuration
The relay BU1AC of the BASIC LINE is equipped with an over- (U>) and undervoltage supervision (U<) with separate adjustable pick-up values and common trip delay (t) and hysteresis (DIFF).
The BU1AC 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 Diagram “A” (2-wire system)
Connection Diagram “B” (3-wire system)
Connection Diagram “C” (4-wire system)
| System | Relay Type | Connection Diagram |
|---|---|---|
| 3-phase 110 V | BU1AC 110 | B |
| 3-phase 400 V | BU1AC 400 | B |
| 3-phase 400/230 V with N | BU1AC 230 | C (or A for single-phase measuring) |
| 3-phase 690/400 V with N | BU1AC 400 | A (only single-phase measuring possible) |
Settings
| Parameter | Range |
|---|---|
| U< | 70% … 110% Un |
| U> | 90% … 130% Un |
| t | 0 … 10 s |
| DIFF | 2% … 10% |
| fn | 45 … 66 Hz |
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
Under-/Overvoltage supervision (one or three phase)
Separate settings for V< and V>
Settable hysteresis 2%, 4%, 6%, 8%, 10%
Two output relays
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.