The Siemens 3NW7033 is a three-phase modular fuse holder (3 poles) designed to accommodate 10×38 mm cylindrical fuse links, commonly used for protecting electrical lines and equipment in industrial installations, distribution boards, and automation systems.

This device allows the installation of three independent fuse links, providing compact and reliable protection for three-phase circuits against overcurrents and short circuits.

Thanks to Siemens’ modular construction and compatibility with standard DIN rail mounting, the fuse holder ensures fast and secure installation inside electrical panels.

⚙️ Technical Specifications

Brand: Siemens
Model: 3NW7033
Type: Modular fuse holder
Number of poles: 3P (three-phase)
Compatible fuse type: Cylindrical 10 × 38 mm
Rated current: 32 A
Rated voltage: up to 690 V AC
Power dissipation: approx. 3 W
Standard: IEC 60947-3

🔌 Electrical & Mechanical Data

• Cable cross-section: 0.5 – 10 mm²

• Terminal tightening torque: approx. 1.2 Nm

• Mounting: DIN rail 35 mm

🔌 Connections

The device includes six connection terminals:

Line input:

• 1

• 3

• 5

Load output:

• 2

• 4

• 6

Typical configuration for three-phase protection systems.

🛡 Construction Features

✔ Compact Siemens modular design
✔ Housing for 3 cylindrical fuse links 10×38 mm
✔ Robust screw terminals
✔ High reliability for industrial applications
✔ Simple DIN rail installation

⚠ Safety marking present on the device:
“Do not operate under load.”

🏭 Applications

The Siemens fuse holder is suitable for:

✔ Industrial electrical panels
✔ Three-phase line protection
✔ Industrial automation systems
✔ Photovoltaic installations
✔ Power distribution boards
✔ Protection of motors and electrical equipment