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1SCA105258R1001 ABB 1250A 4-Pole BS Switch Fuse with Fused and Switched Neutral
ABB OS1250B04FP is a 1250 A 4-pole front-operated BS-type switch fuse for D1 fuse links with a fused and switched neutral, supplied with a 395 mm shaft and OHB274J12 external handle for high-current industrial isolation and fuse protection.
£2,834.12
Why Choose the ABB OS1250B04FP Switch Fuse?
The ABB OS1250B04FP 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 1SCA105258R1001, it forms part of the ABB OS switch-fuse range and combines manual circuit isolation with fuse-based protection.
Designed for D1 fuse links, the OS1250B04FP uses a front-operated configuration with the operating mechanism located at the end of the switch. The fourth pole is a fused and switched neutral, providing simultaneous switching of the three phase conductors and neutral while retaining fuse protection in the neutral pole.
This configuration is supplied with a 395 mm shaft and OHB274J12 external handle. The handle is IP65 protected, padlockable in the OFF position and provides door interlocking in the ON position, making the OS1250B04FP suitable for demanding switchboard and power-distribution installations.
Key Advantages
- 1250 A rating for high-current industrial distribution applications.
- 4-pole configuration with a fused and switched neutral.
- Designed for compatible D1 BS-type fuse links.
- Combines circuit switching, isolation and fuse protection in one assembly.
- Front-operated design for switchboard and enclosure installations.
- Supplied with a 395 mm shaft and OHB274J12 external handle.
- IP65 handle with OFF-position padlocking and ON-position door interlocking.
Key Features
- ABB OS1250 series switch fuse.
- 1250 A for AC-20A to AC-22A utilisation.
- 1000 A for AC-23A utilisation.
- 4 poles.
- Fused and switched neutral.
- BS-type D1 fuse compatibility.
- Front-operated configuration.
- Operating mechanism located at the end of the switch.
- Includes terminal bolt set.
- Includes 395 mm shaft and OHB274J12 handle.
- ABB order code 1SCA105258R1001.
High-Current Four-Pole Isolation and Fuse Protection
The ABB OS1250B04FP combines a high-current switching mechanism with compatible D1 fuse links, enabling the circuit to be manually switched and isolated while the installed fuses provide overcurrent and short-circuit protection. Its 4-pole arrangement incorporates a fused and switched neutral, allowing all four conductors to be operated through the switch-fuse assembly.
The supplied 395 mm shaft and external OHB274J12 handle provide through-door operation from outside the electrical enclosure. OFF-position padlocking supports secure isolation procedures, while ON-position door interlocking helps control enclosure access when the switch fuse is operating.
Typical Applications
- High-current industrial low-voltage distribution systems.
- Main switchboards and power-distribution assemblies.
- Four-pole circuits requiring a fused and switched neutral.
- Industrial feeder isolation and fuse protection.
- Large machinery and process installations.
- Commercial and industrial installations using compatible D1 BS fuse links.
Technical Specifications
| Series | OS1250 |
|---|---|
| ABB order code | 1SCA105258R1001 |
| 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 |
| Number of poles | 4 |
| Neutral configuration | Fused and switched neutral |
| Operation | Front operated |
| Mechanism position | End of switch |
| Included shaft | 395 mm |
| Included handle | OHB274J12 external handle |
| Handle protection | IP65 |
| Padlocking | OFF position |
| Door interlocking | ON position |
| Terminal hardware | M12 × 50 terminal bolt set |
| Product group | 311021-OS Fuse Switches |
Frequently Asked Questions
What is the ABB OS1250B04FP?
The ABB OS1250B04FP is a 1250 A, 4-pole BS-type switch fuse designed for high-current switching, isolation and fuse protection, with a fused and switched neutral.
What fuse size does the ABB OS1250B04FP use?
The OS1250B04FP is designed for compatible D1 BS-type fuse links.
What is the current rating of the ABB OS1250B04FP?
The OS1250B04FP is rated at 1250 A for AC-20A to AC-22A utilisation and 1000 A for AC-23A utilisation.
What does the fourth pole do on the ABB OS1250B04FP?
The fourth pole provides a fused and switched neutral, allowing the neutral conductor to be switched together with the three phase conductors while also incorporating fuse protection.
Are the handle and shaft included with the ABB OS1250B04FP?
Yes. The OS1250B04FP is supplied with a 395 mm shaft and an OHB274J12 external handle.
Can the ABB OS1250B04FP be padlocked for isolation?
Yes. The supplied external handle is padlockable in the OFF position and provides door interlocking in the ON position. The handle is also protected to IP65.
Trusted by Electrical Professionals Worldwide
ABB OS switch fuses combine dependable high-current isolation with fuse-based circuit protection, providing robust switching solutions for industrial switchboards, power-distribution systems and demanding low-voltage installations.
