The NX7 bsr-3-690-200.3 from em test is a Coupling Decoupling Network with Frequency 50 to 60 Hz, Operating Voltage 85 to 264 VAC, Burst Voltage 5.5 kV, Surge Voltage 7 kV, Ringwave Voltage 7 kV. More details for NX7 bsr-3-690-200.3 can be seen below.