Why Choose the ABB OS125TPN-A 125 A 3P+N IP65 Steel Enclosed Switch Fuse?
The ABB OS125TPN-A is a 125 A, 3-pole plus neutral steel enclosed switch fuse designed for electrical isolation, load switching and fuse-based circuit protection in industrial and commercial low-voltage installations. Part of ABB's metal enclosed load-break switching range, it combines a robust switch-fuse mechanism with a protective steel enclosure, making it suitable for electrical distribution and machinery supply applications.
Featuring an IP65-rated steel enclosure, a detachable neutral link and a padlockable pistol-grip operating handle, the OS125TPN-A provides a practical solution for installations requiring local electrical isolation and coordinated fuse protection. Its enclosure incorporates removable gland plates and a lockable hinged cover to support installation and maintenance.
The OS125TPN-A is specified for 125 A and accommodates BS88 A2/A3 fuse sizes. ABB's catalogue lists AC-23 motor switching powers of 55 kW at 400 V, 75 kW at 500 V and 110 kW at 690 V. Identified by ABB order code OS125TPN-A, the unit provides an enclosed switching and protection solution for appropriately rated industrial electrical circuits.
Key Advantages
- 125 A current rating for compatible industrial and commercial electrical installations.
- 3-pole plus neutral configuration suitable for three-phase electrical distribution systems.
- Detachable neutral link provides a dedicated neutral connection arrangement.
- Integrated switch-fuse functionality combines manual isolation with fuse-based circuit protection.
- IP65-rated steel enclosure provides dust-tight protection and resistance to low-pressure water jets.
- Powder-coated RAL 7035 finish provides a durable enclosure surface.
- Padlockable pistol-grip handle supports controlled isolation during maintenance.
- Lockable hinged enclosure cover provides controlled access to internal components.
- Removable gland plates simplify the planning and installation of cable entries.
- BS88 A2/A3 fuse compatibility supports suitable circuit protection arrangements.
- 400 × 300 × 150 mm enclosure dimensions support installation planning.
- Supplied with fuse links according to ABB's enclosed switch-fuse catalogue.
- Suitable for appropriately rated electrical distribution and industrial motor applications.
Key Features
- ABB OS125TPN-A steel enclosed switch fuse.
- 125 A rated current.
- 3P+N configuration with detachable neutral link.
- IP65 enclosure protection rating.
- Steel enclosure with powder-coated textured finish.
- RAL 7035 enclosure colour.
- Padlockable pistol-grip operating handle.
- Hinged cover with lock.
- Removable cable gland plates.
- BS88 A2/A3 fuse size compatibility.
- 55 kW AC-23 motor switching power at 400 V.
- 75 kW AC-23 motor switching power at 500 V.
- 110 kW AC-23 motor switching power at 690 V.
- 400 mm enclosure height.
- 300 mm enclosure width.
- 150 mm enclosure depth.
- Designed for surface-mounted electrical installations.
- Suitable for local electrical isolation and fused load switching.
Technical Specifications
- Manufacturer: ABB
- Series: OS Enclosed Switch Fuses
- Model: OS125TPN-A
- ABB order code: OS125TPN-A
- Product group: 311019 – Metal Enclosed (Loadbreak)
- Product type: Steel enclosed switch fuse
- Rated current: 125 A
- Electrical configuration: 3P+N
- Number of switched phase poles: 3
- Neutral arrangement: Detachable neutral link
- Enclosure protection rating: IP65
- Enclosure material: Steel
- Enclosure finish: Powder-coated textured finish
- Enclosure colour: RAL 7035
- Fuse size: BS88 A2/A3
- Fuse arrangement: Switch fuse
- Fuse supply: Supplied with fuses
- AC-23 motor switching power at 400 V: 55 kW
- AC-23 motor switching power at 500 V: 75 kW
- AC-23 motor switching power at 690 V: 110 kW
- Operating handle: Pistol-grip handle
- Handle locking: Padlockable
- Enclosure cover: Hinged, lockable
- Cable entry provision: Removable gland plates
- Mounting arrangement: Surface mounting
- Enclosure height: 400 mm
- Enclosure width: 300 mm
- Enclosure depth: 150 mm
- Dimensions (H × W × D): 400 × 300 × 150 mm
- Primary function: Electrical isolation, load switching and fuse-based protection
- Product family: ABB OS metal enclosed switch fuses
Reliable Fused Isolation for Industrial Electrical Distribution and Motor Control
The ABB OS125TPN-A provides a combined switching and fuse-based protection arrangement for compatible low-voltage electrical systems. Enclosed switch fuses are commonly used as local isolation points or main switching devices in industrial distribution installations, where equipment requires both manual disconnection and correctly coordinated fuse protection.
Its 125 A rating and 3P+N configuration make it suitable for appropriately designed three-phase electrical circuits. The three phase poles provide the switching function, while the detachable neutral link provides a separate neutral connection. The neutral link should not be treated as a fourth switched pole.
The OS125TPN-A accommodates BS88 A2/A3 fuse sizes, allowing suitable fuse protection to be selected for the connected electrical circuit. Correct fuse selection must consider the required current rating, breaking capacity, conductor protection, prospective short-circuit current and coordination with downstream equipment.
The IP65 steel enclosure provides protection against dust ingress and low-pressure water jets when correctly installed. Its padlockable operating handle, lockable hinged cover and removable gland plates support practical installation and maintenance. ABB's enclosed switch-fuse catalogue identifies this IP65 steel enclosure range as not suitable for external installation, so environmental suitability must be assessed before selecting an installation location.
Typical Applications
- Industrial low-voltage electrical distribution.
- Commercial building electrical supply installations.
- Local fused isolation of industrial machinery.
- Three-phase equipment supply circuits.
- Industrial motor control and motor supply isolation.
- Manufacturing and production facilities.
- Industrial pump and ventilation installations.
- Electrical distribution and control equipment.
- Machinery maintenance and servicing isolation points.
- Electrical installations requiring BS88 fuse protection.
- Industrial plant rooms and equipment areas.
- Installations requiring IP65 steel enclosed switch-fuse equipment.
