3LD Non-Fused Switch Disconnectors

Non-fused switch disconnectors are a safety device designed to power down or isolate a part of a circuit while it is being serviced or maintained.

Fused switch disconnectors contain multiple fuses inside the same enclosure, so that you can select and isolate a particular part of the circuit. They isolate a given part of the circuit by cutting off its electrical supply.

Unlike fused switch disconnectors, non-fused switch disconnectors do not use a fuse to break the circuit, instead using either a rotary or knife-blade disconnect.

Rotary switches break the circuit by rotation of a lever, while knife-blade switches use a hinge to lift a lever off its slot.

Non-fused switch disconnectors are used to isolate circuit breakers, transmission lines and transformers as part of their maintenance process. They are a safety measure and are not intended for use as a regular part of the circuit.

Non-fused switch disconnectors vary in the method of disconnecting that they use, whether rotary or knife-blade.

Beyond that, they have differing power, voltage and switch ratings, as well as different maximum current capabilities, which will determine which non-fused switch disconnector you choose.

The 3LD switches are used for switching main and auxiliary circuits, but also for switching induction motors and other loads during maintenance and repair work.

They can be used as ON-OFF switches, emergency-stop switches and main control switches according to EN 60204-1. They are manually operated and can be used in any mounting positions.

If you are interested in the Siemens 3LD Non-Fused Switch Disconnectors, such as the 3LD2064-1GP51, or any other Siemens products please call 01244 288138 or email info@dbicontrol.co.uk to speak to one of our team.