Features :

The following low-power current transformer ratios are suitable for the following primary current operating ranges:

• 300 A /225 mV for a primary operating current range of 60 A to 630 A
• 600 A /225 mV for a primary operating current range of 120 A to 1250 A
• 1250 A /225 mV for a primary operating current range of 250 A to 2500 A
• 100 A /225mV for a primary operating current range of 20 A to 200 A

The SIPROTEC 7SJ81 units can be used for line protection of high and medium-voltage networks with grounded, low-resistance grounded, isolated or a compensated neutral point.

Hardware

• 4 current inputs
• 0/3 voltage inputs
• 3/7 binary inputs (thresholds configurable using software)
• 5/8 binary outputs (2 changeover/Form C contacts)
• 1 life contact
• Pluggable voltage terminals