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1SCA022779R0360 ABB 250 A 4-Pole Fuse Switch Disconnector
ABB OS250B22N2 is a 250 A 4-pole front-operated fuse switch disconnector with a between-the-poles mechanism, switched solid-link fourth pole and British Standard B1–B3 fuse compatibility for industrial switching, isolation and protection.
£585.17
Why Choose the ABB OS250B22N2 Fuse Switch Disconnector?
The ABB OS250B22N2 is a robust 250 A, 4-pole fuse switch disconnector designed for reliable switching, isolation and fuse protection in industrial low-voltage electrical distribution systems. As part of the proven ABB OS switch fuse series, it provides dependable front-operated switching combined with British Standard fuse protection for demanding industrial applications. :chatgpt-content-reference{index="0"}
This model features a 22 operating mechanism positioned between the poles, a switched solid-link fourth pole on the right side and a front-operated configuration. The OS250B22N2 is designed for British Standard B1–B3 fuse links and is supplied without handle and shaft, allowing compatible ABB operating accessories to be selected separately. :chatgpt-content-reference{index="1"}
With a rated current of 250 A, a rated operational voltage of 690 V AC and AC-23A switching capability up to 250 kW, the OS250B22N2 provides dependable circuit isolation and fuse protection for industrial switchboards, machinery and power distribution systems. :chatgpt-content-reference{index="2"}
Key Advantages
- Heavy-duty 250 A fuse switch disconnector for industrial power systems.
- 4-pole configuration with switched solid-link fourth pole.
- 22 operating mechanism positioned between the poles.
- Compatible with British Standard B1–B3 fuse links.
- Top In – Bottom Out and Bottom In – Top Out terminal positions.
- Supplied without handle and shaft for flexible accessory selection.
Key Features
- ABB OS switch fuse series.
- 250 A rated current.
- 4-pole construction.
- Front-operated switch fuse arrangement.
- 22 mechanism between the poles.
- Switched fourth pole with solid link.
- Fourth pole positioned on the right side.
- British Standard fuse system.
- Suitable for B1, B2 and B3 fuse sizes.
- Base mounting construction.
- Lug terminal connections.
- Handle and shaft not included.
Reliable Switching, Isolation and Fuse Protection
Fuse switch disconnectors combine manual circuit switching and isolation with fuse-based protection against overcurrent and short-circuit conditions. This enables electrical circuits to be safely disconnected for maintenance while suitable fuse links protect connected equipment and conductors.
The ABB OS series is engineered for industrial electrical distribution where reliable switching performance, robust construction and flexible installation are required. The OS250B22N2 combines a 250 A rating, four-pole design and central operating mechanism for dependable operation in machinery, switchboards and industrial power systems. :chatgpt-content-reference{index="3"}
Typical Applications
- Industrial electrical distribution panels.
- Machinery and equipment isolation.
- Power feeder protection and switching.
- Industrial switchboards.
- Electrical control cabinets.
- OEM machinery and automation systems.
Technical Specifications
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| Mounting Type | Base / panel | |
|---|---|---|
| Series | OS Switch Fuses | |
| ABB order code | 1SCA022779R0360 | |
| Product type | Fuse switch disconnector | |
| Rated current | 250 A | |
| Number of poles | 4 | |
| Operation | Front operated | |
| Operating mechanism | 22 (between the poles) | |
| Fourth pole type | Switched with solid link | |
| Fourth pole position | Right side | |
| Fuse system | British Standard | |
| Fuse size | B1–B3 | |
| Rated operational voltage | 690 V AC | |
| Rated insulation voltage | 1000 V | |
| Rated impulse withstand voltage | 12 kV | |
| Rated short-time withstand current | 8 kA for 1 s | |
| Rated conditional short-circuit current | 80 kA at 690 V | |
| Rated operational power AC-23A | 75 kW at 220–240 V, 140 kW at 400 V, 145 kW at 415 V, 170 kW at 500 V, 250 kW at 690 V | |
| Mounting type | Base mounting | |
| Terminal type | Lug terminals | |
| Terminal width | 25 mm | |
| Tightening torque | 30–44 N·m | |
| Handle type | Pistol | |
| Dimensions (H × W × D) | approx. 200 × 219 × 130 mm | |
| Weight | approx. 4.7 kg | |
| Standard | IEC 60947-3 |
Frequently Asked Questions
What is the ABB OS250B22N2 used for?
The OS250B22N2 is used for switching, isolation and fuse protection in industrial low-voltage electrical distribution systems.
What is the rated current of the ABB OS250B22N2?
The ABB OS250B22N2 has a rated current of 250 A.
How many poles does the OS250B22N2 have?
The OS250B22N2 has a 4-pole configuration with a switched solid-link fourth pole.
Which fuse sizes are suitable for the OS250B22N2?
The OS250B22N2 is designed for British Standard B1, B2 and B3 fuse links.
Are the handle and shaft included?
No. The OS250B22N2 is supplied without handle and shaft, allowing compatible ABB operating accessories to be selected separately.
Trusted Industrial Circuit Protection from ABB
ABB OS switch fuses provide dependable switching, isolation and fuse protection for industrial low-voltage electrical systems, supporting safe operation and reliable power distribution.
