Certain Application in Control and Mesearurement circuits necessiate locating operating faults quickly without disconnecting the conductors. elmex offers a range of disconnecting type terminal blocks which can be used to disconnect the continuity without actually removing the wires. DSDT 2.5 : These Terminal Blocks finds special application in control and instrumentation industry. The hinged knife edge lever can be easily pushed open to simulate faulty condition. The copper link and brass contacts are tin plated offering low contact resistance.