Description
SIEMENS
SITOR
3NC1091
FUSE SWITCH
POWER SUPPLY: 32A 690V A.C
IEC 60947-3 AC-22B 32A 400V 50/60 HZ DC-20B
18..4 AWG
0.75.. 25 mm2
CU ONLY 75°C WIRE
The Siemens Sitor 3NC1091 is a fuse switch for power distribution in a marine control system, pairing a switched disconnect with fuse protection on the circuit it feeds. It is rated 32 A at 690 V AC and is marked to IEC 60947-3 with AC-22B duty at 32 A 400 V, 50/60 Hz, alongside a DC-20B rating. Terminals take conductors from 18 to 4 AWG, equal to 0.75 to 25 mm², and are specified for copper wire rated 75°C only. This unit comes in used condition and suits control panel and switchboard feeder positions.
Key Features
✓ Rated 32 A, 690 V AC
✓ IEC 60947-3 AC-22B at 32 A 400 V, 50/60 Hz
✓ DC-20B rating
✓ Conductor range 18 to 4 AWG, 0.75 to 25 mm²
✓ Copper conductors only, 75°C wire
Marine Applications
✓ Fused isolation of control panel power feeds
✓ Protection of automation and instrument supply circuits
✓ Sub-distribution boards for engine room controls
✓ Isolation point for maintenance on control cabinets
Technical Support
Prota Marine provides technical support, repair and onboard installation for the fuse switch and the wider marine control system. Support covers fault diagnosis on fused supply circuits. We also provide commissioning support after the switch is wired in.
