About this species. Blackthorn is a shrub belonging to the same genus (Prunus) as almond, cherry and plum trees. The specific epithet spinosa refers to the sharp spines or thorns that are characteristic of this plant.
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A residual-current device (RCD), or residual-current circuit breaker (RCCB), is a device to quickly disconnect current to prevent serious harm from an ongoing electric shock.Injury may still occur in some cases, for example if a person falls after receiving a shock.esidual-current and overcurrent protection may be combined in one device for installation into the service panel; this device is known as a GFCI (ground fault circuit interrupter) breaker in the USA and Canada, and as an RCBO (residual-current circuit breaker with overload protection) in Europe.