Abstract: An earth leakage circuit breaker has a socket for connecting an appliance to be protected. A plug inserted in the socket depresses a plunger (34), tilting a cam (38) which acts through a striker (42) to momentarily close a relay, thus resetting the circuit breaker. When the appliance is unplugged the cam returns to its normal position, by-passing the striker (42) but closing a pair of test contacts. The reset and test functions are thus carried out without the need for separate buttons, and at times the load is disconnected, so that the circuit breaker contacts do not break load current when they open or close during resetting or testing.

Abstract: A mower includes a cylindrical cutting unit mounted for rotation about a substantially horizontal axis and an air pump for establishing a cushion of pressurized air for supporting the mower above a ground datum. A hood separates the cushion of air from the cylindrical cutting unit and from a grass collector.