Phase Monitoring / Potential Selector

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  2P48 Potential Selecting Relay

  The 2P48 relay is a phase failure relay suitable for 3 phase supplies. The relay is designed to automatically change over from the primary supply to the secondary supply if any phase of the primary supply has faulted. The 2P48 output relay is normally energised and drops out if the phase angle unbalance is greater than the pre-set, an under voltage or reverse phase sequence condition exists. A front panel…
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  2P49 Three Phase Voltage Monitoring Relay

  The main earth fault protection relays in distributions systems, power stations & large manufacturing / processing plants can fail to detect a high impedance breakdown to earth causing hazard to human life & potential damage to plant & equipment. In these & other situations demanding extra sensitive earth fault protection, the 2P49 relay using solid state techniques, can be applied to detect earth currents down to 0.5% of the CT…
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  2P740 700 Series Fail, Reversal, Under voltage Relay

  The 2P740 Series relays are solid state voltage sensing relays with electromechanical output contacts. Designed for application on 3 phase AC voltage systems the 2P740 is ideally suited to monitor power supply phase angle imbalance, undervoltage and reverse phase sequence. The 2P740 measuring circuitry keeps the output relay energised while the 3 phase supply remains within the specified imbalance window thus providing failsafe system protection. In the event of any…