OS250B21LR

Name: OS250B21LR
Brand: ABB
SKU: OS250B21LR

The OS250B21LR switch fuse from ABB provides exceptional reliability and high protection, ensuring rapid fault clearance and maintaining protection levels even after faults occur. Suitable for AC-22B applications up to 415V, it is designed to meet the demands of various electrical systems.

Product ModelOS250B21LR

Material Number1SCA022854R5510

Product ID77444

Stock on Request

Last updated: 8/29/2026

Quantity

Key Features

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1. High Protection and ReliabilityThe OS250B21LR switch fuse is engineered to provide high levels of protection and reliability, ensuring that electrical systems operate safely and efficiently.
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2. Rapid Fault ClearanceDesigned to clear faults quickly, this switch fuse minimizes downtime and maintains system integrity, making it ideal for critical applications.
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3. Versatile ApplicationSuitable for AC-22B applications up to 415V, the OS250B21LR switch fuse can be used in a variety of electrical systems, including those requiring high current ratings.
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4. Compact DesignThe modular design of the OS250B21LR switch fuse allows for easy installation and flexibility in various mounting configurations, including wall horizontal, totally enclosed, and ceiling mounting.

Technical Specifications

Detailed engineering parameters based on manufacturer documentation

Specifications may be subject to change without notice

Parameter

Value

Parameter

Value

Pollution Degree

Product Net Width

297 mm

Product Net Height

150 mm

Product Net Depth / Length

218 mm

Product Net Weight

5.08 kg 11.2 lb

Conventional Free-air Thermal Current (Ith)

Î = 40 Â°C 250 A

5. High-Performance MaterialsConstructed with high-performance materials, the OS250B21LR switch fuse ensures long-lasting performance and durability, even under demanding conditions.

Conventional Thermal Current (Ithe)

Fully Enclosed 315 A

Fuse System

British Standard

Handle Type

Handle and shaft not included

Mounting Type

Base mounting

Number of Poles

Operating Mode

Front Operated

Pollution Degree

Position of Line Terminals

Left In - Right Out

Power Loss

at Rated Operating Conditions per Pole 17 W

Rated Conditional Short-Circuit Current (Inc)

(690 V) 80 kA

Rated Current (In)

Main Circuit 250 A

Rated Impulse Withstand Voltage (Uimp)

12 kV

Rated Insulation Voltage (Ui)

1000 V

Rated Operational Current AC-21A (Ie)

(500 V) 250 A (690 V) 250 A

Rated Operational Current AC-22A (Ie)

(380 ... 415 V) 250 A (500 V) 250 A (690 V) 250 A

Rated Operational Current AC-23A (Ie)

(380 ... 415 V) 250 A (500 V) 250 A (690 V) 250 A

Rated Operational Power AC-23A (Pe)

(220 ... 240 V) 75 kW (400 V) 140 kW (415 V) 145 kW (500 V) 170 kW (690 V) 250 kW

Rated Operational Voltage

Main Circuit 690 V AC

Rated Short-time Withstand Current Low Voltage (Icw)

for 1 s 8 kiloampere rms

Standards

IEC 60947-3

Switches Operating Mechanism

21 (Between the Poles)

Terminal Type

Lug terminals

Terminal Width

25 mm

Tightening Torque

30 ... 44 NÂ·m

Tightening Torque

30 ... 44 NÂ·m

Object Classification Code

ETIM 8

EC001040 - Fuse switch disconnector

ETIM 9

EC001040 - Fuse switch disconnector

UNSPSC

39122233

IDEA Granular Category Code (IGCC)

5291 >> Fuse switch disconnector

eClass

V11.1 : 27371401

WEEE Category

5. Small Equipment (No External Dimension More Than 50 cm)

Manufacturer ID

1SCA022854R5510