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1SCA107937R1001 ABB 1250A 4-Pole D1 Switch Fuse with Switched Neutral
ABB OS1250B22N2P is a 1250 A 4-pole front-operated BS-type switch fuse for D1 fuse links with a non-fused switched neutral on the right-hand side and an included shaft and pistol handle for high-current industrial isolation and fuse protection.
£2,483.20
Why Choose the ABB OS1250B22N2P Switch Fuse?
The ABB OS1250B22N2P is a heavy-duty 1250 A, 4-pole BS-type switch fuse designed for high-current industrial low-voltage distribution systems. With ABB order code 1SCA107937R1001, it forms part of the ABB OS switch-fuse range and combines dependable manual isolation with fuse-based circuit protection.
Designed for D1-size fuse links, the OS1250B22N2P uses a front-operated mechanism positioned between the poles. Its fourth pole is a non-fused switched neutral positioned on the right-hand side, providing simultaneous neutral switching while the three phase poles accommodate the protective fuse links.
The OS1250B22N2P is supplied with an OXP12X395 shaft, OHB274J12 black ON-OFF pistol handle and terminal bolt kit. The external handle is protected to IP65, padlockable in the OFF position and provides door interlocking in the ON position, supporting secure operation and isolation in demanding switchboard installations.
Key Advantages
- 1250 A rating for high-current industrial distribution applications.
- 4-pole arrangement incorporating a switched neutral.
- Non-fused switched neutral positioned on the right-hand side.
- Designed for compatible D1-size BS fuse links.
- Front-operated mechanism between the poles for switchboard integration.
- Supplied with shaft, external pistol handle and terminal bolt kit.
- IP65 handle with OFF-position padlocking and ON-position door interlocking.
Key Features
- ABB OS1250 series switch fuse.
- 1250 A rated operational current for AC-20A to AC-22A duty.
- 1000 A rated operational current for AC-23A duty.
- 4-pole configuration.
- BS-type D1 fuse compatibility.
- N2 non-fused switched neutral on the right-hand side.
- 22 operating mechanism positioned between the poles.
- 50 mm terminal width.
- Supplied with OXP12X395 shaft.
- Supplied with OHB274J12 pistol handle.
- ABB order code 1SCA107937R1001.
High-Current Switching with a Non-Fused Switched Neutral
The ABB OS1250B22N2P combines high-current manual switching with compatible D1 fuse links, enabling the phase conductors to be isolated while appropriately selected fuses provide overcurrent and short-circuit protection. The fourth pole is a non-fused switched neutral on the right-hand side, allowing the neutral conductor to be switched as part of the same operating action without placing a fuse in the neutral path.
Its mechanism is positioned between the poles, while the supplied OXP12X395 shaft and OHB274J12 external pistol handle provide through-door operation from outside the electrical enclosure. OFF-position padlocking and ON-position door interlocking support controlled isolation and maintenance procedures in high-current industrial distribution systems.
Typical Applications
- High-current industrial low-voltage distribution systems.
- Main switchboards and power-distribution assemblies.
- Four-pole circuits requiring a switched neutral.
- Industrial feeder switching, isolation and fuse protection.
- Large machinery and process installations.
- Commercial and industrial installations using compatible D1 BS fuse links.
Technical Specifications
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| Mounting Type | Base / panel | |
|---|---|---|
| Series | OS1250 | |
| ABB order code | 1SCA107937R1001 | |
| Product type | Switch fuse | |
| Fuse system | BS type | |
| Fuse size | D1 | |
| Rated current, AC-20A to AC-22A | 1250 A | |
| Rated current, AC-23A | 1000 A | |
| Rated operational power, AC-23A at 400/500/690 V | 560/710/1000 kW | |
| Number of poles | 4 | |
| Neutral configuration | Non-fused switched neutral | |
| Neutral position | Right-hand side | |
| Operation | Front operated | |
| Operating mechanism | 22 – between the poles | |
| Mounting | Base mounted | |
| Terminal width | 50 mm | |
| Included shaft | OXP12X395 | |
| Included handle | OHB274J12 pistol handle | |
| Handle protection | IP65 | |
| Padlocking | OFF position | |
| Door interlocking | ON position | |
| Included terminal bolts | M12 × 50 | |
| Product group | 311021-OS Fuse Switches |
Frequently Asked Questions
What is the ABB OS1250B22N2P?
The ABB OS1250B22N2P is a 1250 A, 4-pole BS-type switch fuse for D1-size fuse links, featuring a non-fused switched neutral on the right-hand side.
What fuse size does the ABB OS1250B22N2P use?
The OS1250B22N2P is designed for compatible D1-size BS fuse links.
What is the current rating of the ABB OS1250B22N2P?
The OS1250B22N2P is rated at 1250 A for AC-20A to AC-22A utilisation and 1000 A for AC-23A utilisation.
What type of neutral pole does the OS1250B22N2P have?
The fourth pole is a non-fused switched neutral positioned on the right-hand side of the switch fuse.
Where is the operating mechanism positioned on the OS1250B22N2P?
The OS1250B22N2P uses ABB's 22 configuration, with the front-operated switching mechanism positioned between the poles.
Are the handle and shaft included with the ABB OS1250B22N2P?
Yes. The OS1250B22N2P is supplied with an OXP12X395 shaft and an OHB274J12 pistol handle. The handle is protected to IP65, padlockable in the OFF position and provides door interlocking in the ON position.
Trusted by Electrical Professionals Worldwide
ABB OS switch fuses combine dependable high-current isolation with fuse-based circuit protection and flexible neutral switching arrangements, providing robust solutions for industrial switchboards, machinery and low-voltage power-distribution systems.
