MBD1-D series surge protective device (hereinafter called SPD) is suitably used in the IT, TT, TN-C, TN-S, TN-C-S and etc power supply system of AC 50/60Hz, rated voltage up to 380V, to protect from direct and indirect lightning impulse and other transient over voltage. As per the conditions of IEC61643-1:1998-02 standard, Class III surge protective device, it is category D surge protective device.
SPD has two protection modes: MC and MD
SPD is in compliance with GB18802.1/IEC61643-1 standards.

Meba surge protection MBD1-D20

Technical Parameter

Operation Elements
SPD as only one side of terminals, able to prevent from being electric touching, indoor fixedly mounted, limiting voltage.
SPD has built-in disconnector, when SPD is invalid due to overheating or breakdown, the disconnector can automatically separate SPD from the network, meanwhile send an indication signal. The visi ble window show white color in normal service, if to be separated from network, it will show red color.
1P+N, 2P +N, 3P+N SPD consist of 1P 2P 3P SPD and NPE neutral and earthing protection modules, used in the power supply system of TN-S , TN-C-S and etc.

– To be mounted between LPZ1 or LPZ2 zone and LPZ3 zone, adopts 35mm standard mounting rail. The cross sectional area of multi-strand s oft copper conductor : 2.5 – 35 mm2.
– Every pole of MBD shall be protected by fuse or mini circuit breaker.
– It is mounted in distribution boxes of living house, computer center, communication equipment, electronic equipment and control equipment or nearest socket box.

Model and Signification

Technical Parameter

Model and specification MBD1-D20 MBD1-D10
Maxi continuous operating voltage 750 420 385 320 275 750 420 385 320 275
Voltage protective level 3.0 2.0 1.8 1.6 1.5 2.0 1.6 1.3 1.2 1.0
Maxi discharging current 20 10
Nominal discharging current 10 5
Response time <25
Protection grade IP20
Indication of invalidation Aging invalidation: white: Normal, red: invalidation
Application Several protection for in line
Remote signal Function Can also picking
Remarks Other maxi continuous operating voltage Can be customize

Principle Diagrams

Outside Size Fig



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