Security box for electrical or electronic components

The box has a body (1) and lid (11) which is hinged (10) and secured by a sprung hasp (12,13). Components, typically fuses (4) may be inserted into sockets (2) to control external circuits (9). The lid has a first plain contact finger (17) engaging with a contact (20) and a second sprung contact finger (18) which engages with a second contact (21) with series resistor (22) such that due to the spring the resistor contact makes and breaks the circuit.