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SPD backup protector

The BYHB series SPD backup protector is designed to meet the lightning protection technical requirements, providing a safe and reliable backup protection solution for the SPD. It ensures that the lightning current can pass through the SPD circuit without causing disengagement. When the residual current in the SPD increases, a short-circuit occurs, or a transient overvoltage happens in the low-voltage system, BYHB can promptly cut off the faulty current to prevent the SPD from catching fire. It solves the safety hazards associated with using traditional MCB or FUSE as the SPD backup protection.

Compared to general MCBs, BYHB has lower residual voltage, making it more effective in safeguarding electrical equipment.


■ Application Range:
Suitable for low-voltage power supply systems below 400V (50/60Hz), including TT, IT, TN, and other configurations.

■ Performance Features:
· Independent main circuit, auxiliary, and disengagement systems.
· Integrated structure, adaptable to different protection modes.
· Low residual voltage design, without affecting the voltage protection level of the SPD.
· Instantaneous or time-delayed disengagement function with precise sampling.
· Test button for verifying the disengagement system status at any time.
· Wide operating capacity design to meet the requirements of different SPD testing types.
· Standard 35mm guide rail for easy installation and use.
· Reinforced nylon casing with IP20 protection rating.


Model BYHB-30 BYHB-40 BYHB-50 BYHB-60 BYHB-80 BYHB-100
Test Types T1/T2
Nominal Operating Voltage Uo (V) 230/400
Impulse Current Iimp (kA) 15 20 25 30 40 50
Maximum Discharge Current Imax (kA) 30 40 50 60 80 100
Nominal Discharge Current In (kA) 15 20 25 30 40 50
Rated Short-Circuit Current Isc (kA) 25
Short-Circuit Operating Current Io (A) 2
Short-Circuit Current Operating Time It (s) 0.3
Residual Voltage Ures (V) 300
Connection Capacity 4~35 mm2
Casing Flame Retardant Rating UL94V-0
Casing Protection Rating IP20
Installation Method DIN:35mm 
Operating Temperature -40℃~70℃
Operating Humidity 5%RH~95RH
Altitude < 2000 m

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