Monitoring electrical contactor health

A method of monitoring contactor health for an electrical contactor of an electric apparatus, the electrical contactor being switchable in a switching event between an open state and a closed state or between a closed state and an open state. In response to a switching event instruction 110 the method comprises determining 120 a current value indicative of current flowing in the electrical contactor in the closed state at a time proximate to the switching event; attributing 130 a percentage of a total contactor life estimate to the switching event based on the current value; determining 140 an updated remaining percentage contactor life estimate 151 by subtracting the percentage of total contactor life estimate from an initial remaining percentage contactor life estimate 141; and outputting 150 the updated remaining percentage contactor life estimate. The current value may be the maximum current from a plurality of samples measured before or after the switching event. The current value may be recorded by incrementing one of a plurality of bins, each corresponding to a current range. The distribution of the plurality of bins may be used to predict the remaining life of the contactor.