2-pair Data surge protector unit

B280-48DBC
Part Number: 72754
B280-48DBC
  • 2-pair surge protection unit
  • 48 V
  • Removable protection circuit
  • Wall mounting and screw connection
  • UL497 A&B

The B280 units are designed to protect terminals connected to telephone or data networks. The protection printed circuit is removable for easy and fast maintenance (S280). These compact boxes are designed for wall mouting and screw connection.


Network RNIS-T0, 48 V line
Nominal line voltage Un 48 V
Max. DC operating voltage Uc 53 Vdc
Max. frequency f max. > 20 MHz
Insertion loss < 1 dB
Max. discharge current Imax 20 kA
Protection mode(s) Common/Differential mode
Protection level Up 75 V
Protection level Up 20 V
Line resistance < 4.7 Ohm
Technology GDT+Clamping diode
SPD configuration 2 pairs
Connection to Network By screw terminal: cross section 0.4-1.5mm²
Format Wall mounting box
Mounting Wall mounting by screws (not supplied)
Housing material Thermoplastic UL94 V-0
Operating temperature Tu -40/+85°C
Protection rating IP20
Failsafe mode Short-circuit - transmision cut-off - fault mode 2
Spare module(s) S280-48DBC
Dimensions See diagram
Weight 0.043 kg
Standards compliance IEC 61643-21 / EN 61643-21 / UL497A
Certification UL listed