SPD - [URL=https://www.pddevices.co.uk/products/buildings/type-2]Surge Protection Device[/URL] (The product designed to protect electrical devices from voltage spikes)TVSS - Transient Voltage Surge Suppressor (Replaced by the acronym SPD)
MCB - Miniature Circuit Breaker
MCCB - Molded Case Circuit Breaker
RCBO - Residual Current Circuit Breaker with Overload
LPS - Lightning Protection System (eg: lightning rod / conductor, earthing wire system, ground rod)
MOV - Metal Oxide Varistor (Technology used within some SPD’s)
SAD - Silicone Avalanche Diode (Technology used within some SPD’s)
GDT - Gas Discharge Tube (Technology used within some SPD’s)