ABB OS400D03 Switch Disconnector Fuse Unit

ABB OS400D03 is a high-performance fuse switch disconnector belonging to ABB's renowned OS series. This 3-pole switch fuse unit is designed for industrial applications requiring reliable circuit protection and safe isolation, with a rated operational current of 400A and voltage rating of 690V AC .

As a professional-grade electrical protection device, the OS400D03 complies with IEC 60947-3 standards and offers exceptional breaking capacity and durability for demanding industrial environments .

Key Specifications at a Glance

Parameter Value

Product Type Fuse Switch Disconnector

Number of Poles 3

Rated Current (In) 400 A

Rated Operational Voltage 690 V AC

Rated Insulation Voltage (Ui) 1000 V

Rated Impulse Withstand Voltage (Uimp) 12 kV

Conditional Short-Circuit Current (Inc) 80 kA at 690V

Short-time Withstand Current (Icw) 14 kA for 1 second

Fuse System DIN (NH0, NH1, NH2)

Standards IEC 60947-3

Protection Degree IP20 (front IP65 with handle)

Detailed Technical Specifications

Electrical Ratings

The OS400D03 delivers impressive electrical performance across various operational categories :

Rated Operational Current (Ie):

AC-21A: 400A at 500V / 690V

AC-22A: 400A at 380-415V / 500V / 690V

AC-23A: 400A at 380-415V / 500V / 690V

Rated Operational Power (Pe) - AC-23A:

220-240V: 132 kW

400V: 220 kW

415V: 230 kW

Mechanical Specifications

Dimension Value

Width 255 mm

Height 230 mm

Depth 193–230 mm (varies by variant)

Weight Approx. 6.5–7.1 kg

Terminal Details:

Terminal Type: Lug terminals

Terminal Width: 25 mm

Tightening Torque: 30–44 N·m

Environmental Ratings:

Pollution Degree: 3

Temperature Rating: Standard industrial range

WEEE Category: 5 (Small Equipment)