ABB OS250D03 High-Performance Fuse Switch Disconnector

ABB OS250D03 is a high-quality fuse switch disconnector designed for demanding industrial and commercial electrical systems. As part of ABB's renowned OS series, this 3-pole switch fuse delivers exceptional reliability, safety, and performance in extreme operating conditions. Whether you need motor circuit protection, main switch disconnection, or safe load isolation, the OS250D03 provides a robust solution that meets international standards .

Key Features

Superior Design and Construction

Self-cleaning contacts ensure world-class performance even in demanding applications, maintaining reliable electrical connectivity over extended service life 

Knife contact design provides long, reliable electrical life without damaging the switch mechanism

Modular architecture enables easy and cost-efficient installation with adjustable shafts and snap-on auxiliary contacts 

Advanced Safety Mechanisms

Interlocking fuse covers prevent opening while the switch is in the "ON" position, significantly reducing electric shock risk during maintenance

Clear visual indication of switch status enhances operator safety

Padlockable handle capability (when equipped) provides lockout/tagout compliance for safe maintenance procedures 

Versatile Installation Options

Available in 2-, 3-, and 4-pole configurations with different switching mechanism positions

Flexible mounting: base mounting compatible with standard industrial enclosures 

Multiple handle options available (pistol handle with shaft included on OS250D03P variant) 

Technical Specifications

Parameter Value

Rated Current (In) 250 A

Rated Operational Voltage 690 V AC

Rated Insulation Voltage (Ui) 1000 V

Rated Impulse Withstand Voltage (Uimp) 12 kV

Number of Poles 3

Fuse Size Compatibility NH0, NH1 (DIN type)

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

Rated Short-time Withstand Current (Icw) 8 kA for 1 second

Power Loss 13 W per pole at rated operating conditions

Terminal Type Lug terminals (25 mm width)

Tightening Torque 30–44 N·m

Pollution Degree 3

Dimensions (W x H x D) 208 mm x 193 mm x 189 mm

Weight Approximately 4.3 kg

Specifications based on manufacturer documentation 

Performance Ratings

AC-23A Motor Switching Applications

The OS250D03 delivers impressive motor switching capabilities across various voltage levels :

Voltage Rated Operational Power (Pe)

220–240 V 75 kW

400 V 140 kW

415 V 145 kW

500 V 170 kW

690 V 250 kW

AC-21A and AC-22A Ratings

AC-21A (500 V / 690 V): 250 A – Suitable for resistive loads including slight overloads

AC-22A (380–690 V): 250 A – Ideal for mixed resistive and inductive loads

Standards and Certifications

The ABB OS250D03 complies with IEC 60947-3, the international standard for low-voltage switchgear and controlgear - switches, disconnectors, switch-disconnectors, and fuse-combination units .

Additional compliance includes:

RoHS Compliant – Environmentally friendly construction

Country of Origin: Finland 

CCC Certificate available for Chinese market compliance

DNV GL Certificate for marine and offshore applications 

Variants and Configurations

The OS250D03 is available in several configurations to meet specific application requirements:

Model Handle/Shaft Key Features

OS250D03 Not included Base model for custom handle integration

OS250D03BB Not included Black housing variant

OS250D03BBP Pistol handle and shaft included Ready-to-use solution with handle

OS250D03P Pistol handle and shaft included Complete assembly with pistol handle

OS250D03N3P Handle and shaft included, 4-pole 4-pole configuration with neutral

Alternative part numbers: 1SCA022720R7080 (OS250D03), 1SCA022719R0090 (OS250D03P)