- Undervoltage monitor for threephase networks without N for monitoring on voltage failure. The voltage is being measured between phases and an artificial neutral point. At symmetrical decrease of the voltage to approx. 50% of the nominal value or in case of failure of a phase the integrated relay (1 change-over contact) releases with a delay ofapprox. 1s. With engines runningon on 2 phases, so much back voltage can be produced that the failure of a phase may be not detected. The SW31K is available for measuring voltages AC 400 V and AC 690 V. As supply voltage in the standard version AC 230 V is needed.
- Rated supply voltage Us.......AC 230 V, +10...-15%, < 3 V
- other Voltages.......upon request
- Frequency.......50/60 Hz
- Relay-Output.......1 change-over contact (co)
- Type of Contact.......Type 2 (see general technical informations)
- Testing Conditions.......see general technical informations
- Rated ambient Temp. Range.......-20°C...+55°C
- Hysteresis.......app. 10% UNenn
- Switching delay.......app. 1 s
- Housing.......Design K
- Dimensions (H x W x D) mm.......75 x 22 x 115 mm
- Protection Housing/Terminals.......IP 30 / IP 20
- Weight.......app.135 g