Fused switch symbol
Also called Fused disconnect, Fuse switch-disconnector
A switch and fuses in one unit: the switch isolates and switches load, the fuses clear faults.
What the fused switch symbol means
A switch and fuses in one unit: the switch isolates and switches load, the fuses clear faults.
ANSI and IEC symbols
Where you see it
Ring main unit transformer feeders, motor feeders and low voltage panels.
What is written next to it
On a one-line, the fused switch carries its tag and its ratings: the switch rating plus the fuse rating and type.
What gets checked at commissioning
Before the fused switch is energised, the test records usually cover: fuse ratings, switch operation and interlocks. Each check is recorded against the tag, so the system can be handed over with its evidence. See commissioning software.
Related symbols
Frequently asked questions
What does the fused switch symbol look like?
On ANSI drawings: A disconnect switch with a fuse in series below it. In IEC 60617: The fuse drawn on the switch blade, with the switch-disconnector marks at the fixed contact. A fuse-disconnector is S00369.
Is the fused switch symbol the same in IEC and ANSI?
No. The fuse drawn on the switch blade, with the switch-disconnector marks at the fixed contact. A fuse-disconnector is S00369. The IEC 60617 number is S00370.
Where is a fused switch used?
Ring main unit transformer feeders, motor feeders and low voltage panels.
- In production since 2014
- Thousands of daily users
- On MODEC FPSO projects since 2016