• Acc. to german EVU-standards for protective equipments
• Rapid phase jump triggering within 20 � 40ms
• High-contrast LCD display
• Displays frequency with 2 places after the decimal point
• Optimum generator protection for mains failure in parallel operation
• Easy-to-use menu control for parameter adjustment and display
• Settings can be changed during operation
• Threshold values, hysteresis and output changeover contacts for over-
   and underfrequency and for over- and undervoltage

This unit protects the generator when phase jumps occur in mains-parallel operation and constantly monitors the 3-phase mains voltage applied and the mains frequency in mains-parallel operation. The output contacts for phase jump, undervoltage and underfrequency are switched as working contacts which automatically switch off the system when undervoltage or underfrequency errors occur. As the rapid switch-off provided by the phase monitoring function causes the unit to immediately disconnect from the mains, there is no short-circuit switch-off (with subsequent total failure), so the system can be automatically reconnected to the mains after a certain mains settling time.

• Real reverse power measurement throught four-quadrant detection
• Precise triggering even in extreme phase position cos-phi
• Setting range 2 - 20% reverse power
• Delay of triggering 1 - 40sec
• Output with two-way contact
• LED displays for exceeding and triggering

The reverse power relay RLZ ( one-phase ) protects the generator from reverse power from the mains. The effective power is detected via a high-precision four- quadrant multiplier which evaluates the effective power regardless of the curve form of the mains voltage. When the reverse power set is exceeded and the timing circuit is completed, the output relay switches through. The switching states are displayed via LED.

• 3-phase AC current monitoring
• The highest current value in each phase leads to swich off
• Independent power supply with at least 1 phase
• Triggers in one-phase operation too
• Overcurrent 0.7 - 1.3 (IR) with time release 1 - 30 sec
• Short-circuit time release 0.1 - 3 sec
• LED displays for exceeding and triggering

3-phase protective device for time-selective overcurrent and short-circuit switch-off in generator and switchgear systems.The unit has an independent power supply and contains 2 seperate trigger circuits with adjustable trigger currents and trigger times. All 3 phases are evaluated individually and the highest value in each phase causes triggering after the value set is exceeded. In the outputs, the switching information is passed on via high-precision two-way contacts ( 250V, 5A ).

• 3-phase AC current monitoring
• The highest current value in each phase leads to switch-off
• Independent power supply with at least 1 phase
• Triggers in one-phase operation too
• Short-circuit time release 0.1 - 3 sec
• LED displays for exceeding and triggering

3-phase protective device for time-selective short-circuit switch-off in generator and switchgear systems. The unit has an independent power supply and contains 1 trigger circuit with adjustable trigger currents and trigger times. All 3 phases are evaluated individually and the highest value in each phase causes triggering after the value set is exceeded. In the outputs, the switching information is passed on via high-pecision two-way contacts ( 250V, 5A ).