Under voltage relay
SP-0 Mod D
The under voltage relay is used for interlocking of switch controls in power and transformer stations, as well as voltage indication on lines / busbars.
Description
The input consists of a star-connected three-phase transformer, followed by a rectifier bridge. R4 and V9 limit the voltage to approx. 27 V DC for the rest of the electronics. The relay K1 is controlled by the comparator V17, which receives its reference from the voltage divider R12, R8.
The measuring voltage is taken from the voltage divider R5, R6. This is selected so that the comparator does not switch on the relay until the pick-up voltage is sufficiently high.
The relay drops out when the voltage after R4 has fallen to 5 volts. R1, R2 and R3 are varistors, which come into operation at approx. 330/600 V~ for the 110/220 V versions, respectively.
Typical applications
Interlocking of switch controls in power and transformer stations. Voltage indication on lines / busbars.
Specifications
Electrical specifications
- Input voltage 110 V or 220 V – 50/60 Hz
- Insulation tested 2.3 kV~ between output and input
- Ambient temperature −20 to +60 °C
Pick-up and drop-out
- Pick-up approx. 40/75 V~
- Drop-out approx. 25/40 V~
For the 110/220 V~ versions respectively, measured at the input
Ordering information
| Part no. | Type | Mounting |
|---|---|---|
| 19-000-14 | SP0 MOD.D 110V 50 / 60 Hz | DIN 35 |
| 19-000-89 | SP0 MOD.D 220V 50 / 60 Hz | DIN 35 |
Ordering and questions
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