Why Choose the ABB OT250KLUU4BZ 250A 4-Pole IP65 Steel Enclosed Switch Disconnector?
The ABB OT250KLUU4BZ (ABB product ID 1SCA022800R7360) is a heavy-duty 250 A, 4-pole steel enclosed switch disconnector designed for reliable manual load switching and electrical isolation in industrial and commercial low-voltage installations. Part of the ABB OT enclosed switch-disconnector range, this assembly combines a durable sheet-steel enclosure, black pistol-type operating handle, blank cable entry areas and IP65 ingress protection for demanding industrial environments.
Designed for industrial machinery and electrical distribution applications, the OT250KLUU4BZ offers a 250 A AC-23A operational current rating at 415 V AC and a corresponding 110 kW AC-23A motor-load switching rating. At 690 V AC, its AC-23A rating is 250 A and 200 kW. The four-pole configuration enables simultaneous disconnection of four conductors, making the switch suitable for compatible three-phase installations requiring switched-neutral isolation.
The switch is supplied in a 600 × 400 × 230 mm grey steel enclosure with blank top and bottom cable entry areas. This arrangement allows installers to prepare suitable cable openings and select glands or flange accessories according to the installation requirements. A black padlockable pistol handle, interlocked enclosure cover, neutral and protective earth terminals complete the assembly. With a catalogue weight of 17 kg, the OT250KLUU4BZ provides a substantial enclosed switching solution for industrial electrical contractors, machinery manufacturers and maintenance engineers.
Key Advantages
- 250 A four-pole switching and isolation for industrial low-voltage electrical equipment.
- 110 kW AC-23A motor-load switching capability at 415 V AC for compatible industrial applications.
- 200 kW AC-23A operational power rating at 690 V AC.
- Four mechanically linked switching poles enable simultaneous isolation of four conductors.
- IP65-rated steel enclosure provides protection against dust and water jets when correctly installed.
- Blank cable entry areas allow customised cable gland and conduit positioning.
- Top and bottom cable entry arrangements support flexible installation layouts.
- Black pistol-type operating handle provides clear ON/OFF control.
- Padlockable operating mechanism supports controlled maintenance isolation procedures.
- Interlocked enclosure cover helps restrict normal access while the switch is ON.
- Neutral and protective earth terminals included for convenient electrical installation.
- Optional auxiliary contacts allow integration with compatible indication and monitoring circuits.
- 600 × 400 × 230 mm enclosure provides space for the switching assembly and cable terminations.
- Robust sheet-steel construction supports demanding industrial applications.
Key Features
- ABB OT enclosed switch-disconnector series.
- Four-pole switch-disconnector configuration.
- 250 A rated operational current for the specified AC-23A switching duties.
- 110 kW AC-23A operational power at 415 V AC.
- 200 kW AC-23A operational power at 690 V AC.
- IP65 ingress protection according to IEC 60529.
- Grey sheet-steel enclosure.
- Black pistol-type manual operating handle.
- I-O / ON-OFF position indication.
- Padlockable handle for maintenance isolation.
- Cover interlocking arrangement with defeatable interlock function.
- Blank top and bottom cable entry areas.
- Installer-prepared cable openings for application-specific gland arrangements.
- Neutral terminal included.
- Protective earth terminals included.
- No auxiliary contacts fitted as standard.
- Maximum auxiliary contact configuration of 2 NO + 1 NC.
- 8 kA rated short-time withstand current.
- Surface-mounted enclosed construction.
- Designed for industrial load switching and electrical isolation in accordance with IEC 60947 switch-disconnector requirements.
Technical Specifications
- Manufacturer: ABB
- Series: OT Enclosed Switch Disconnectors
- Model: OT250KLUU4BZ
- ABB order code: OT250KLUU4BZ
- ABB product ID: 1SCA022800R7360
- Product group: 311019 – Metal Enclosed (Loadbreak)
- Product type: Steel enclosed load-break switch disconnector
- Number of poles: 4
- Number of switching mechanisms: 1
- Operating positions: I-O / ON-OFF
- Operating mechanism: Manual
- Handle type: Pistol-type rotary handle
- Handle colour: Black
- Enclosure material: Sheet steel
- Enclosure colour: Grey
- Ingress protection: IP65
- Rated continuous current (Iu): 250 A
- Rated operational current AC-22A at 400 V AC: 250 A
- Rated operational current AC-23A at 415 V AC: 250 A
- Rated operational current AC-23A at 690 V AC: 250 A
- Rated operational power AC-23A at 415 V AC: 110 kW
- Rated operational power AC-23A at 690 V AC: 200 kW
- Rated short-time withstand current (Icw): 8 kA
- Switching function: Manual load-break switching and electrical isolation
- Cable entry arrangement: Blank cable entries
- Cable entry positions: Top and bottom
- Cable entry preparation: Installer-prepared to suit cable glands or flange accessories
- Cable glands and flanges: Ordered separately
- Neutral terminal: Included
- Protective earth terminals: Included
- Cover arrangement: Interlocked with defeatable interlock
- Padlocking compatibility: Yes
- Auxiliary contacts included: None
- Maximum auxiliary contact configuration: 2 NO + 1 NC
- Enclosure height: 600 mm
- Enclosure width: 400 mm
- Enclosure depth: 230 mm
- Catalogue unit weight: 17 kg
- Mounting arrangement: Enclosed surface-mounted assembly
- Applicable product standards: IEC 60947-1 and IEC 60947-3
- Ingress protection standard: IEC 60529
Reliable Four-Pole Industrial Isolation with Flexible Blank Cable Entries
The ABB OT250KLUU4BZ provides a dependable means of manually disconnecting industrial electrical equipment from its power supply. Its four mechanically linked main poles open together when the black operating handle is moved to the OFF position. This enables simultaneous disconnection of four conductors, making the switch suitable for compatible three-phase systems requiring a switched neutral or other four-pole isolation arrangements.
The switch is designed for AC-23A motor-load switching duties within its specified electrical ratings. At 415 V AC, it provides a 250 A operational current rating and 110 kW operational power rating. At 690 V AC, the corresponding AC-23A rating is 250 A and 200 kW. These ratings support selection for industrial machinery, motor circuits and other inductive loads, provided the actual operating current, voltage and switching duty are compatible.
The IP65 sheet-steel enclosure provides robust mechanical protection and resistance to dust and water ingress when correctly installed. Its substantial construction is suitable for industrial environments where electrical switching equipment must be protected from contamination and incidental contact. The enclosure can be mounted near machinery or incorporated into appropriately designed electrical distribution installations.
A key advantage of the OT250KLUU4BZ is its blank cable entry configuration. Unlike enclosed switch-disconnector variants with predefined cable entry knockouts or ring-flange arrangements, this model allows the installer to prepare suitable openings in the enclosure. This provides flexibility when selecting cable glands, conduit connections and cable entry positions for larger power conductors.
The blank cable entry areas are located at the top and bottom of the enclosure and are also associated with the enclosure's mounting arrangement. Cable entry preparation must therefore follow the manufacturer's installation instructions to avoid interfering with mounting points, internal clearances or the enclosure's mechanical integrity. Suitable sealing accessories are essential to maintain IP65 protection.
The black pistol-type operating handle provides clear ON/OFF operation and supports padlocking in the OFF position for controlled maintenance isolation. The enclosure cover is interlocked with the operating mechanism, helping restrict normal access to internal electrical components while the switch is ON. A defeatable interlock function allows authorised access under appropriate electrical safety procedures.
The assembly includes neutral and protective earth terminals for compatible four-pole electrical installations. No auxiliary contacts are fitted as standard, but compatible accessories can be installed where switch-position indication or control-system feedback is required. The maximum auxiliary contact arrangement is 2 normally open and 1 normally closed contact.
As a switch disconnector, the OT250KLUU4BZ provides manual load switching and electrical isolation rather than automatic overload or short-circuit protection. Suitable protective devices must be selected and installed separately according to the electrical installation requirements and the manufacturer's coordination guidance.
Typical Applications
- High-current industrial machinery isolation.
- Four-pole switching in three-phase electrical systems.
- Electrical installations requiring switched-neutral isolation.
- Industrial motor isolation and local disconnecting points.
- Low-voltage electrical distribution equipment.
- Manufacturing plants and production machinery.
- Industrial pumps and pumping stations.
- Large ventilation fans and HVAC plant.
- Compressors and auxiliary machinery.
- Conveyor and material handling systems.
- Industrial processing and packaging equipment.
- Maintenance isolation for industrial electrical equipment.
- Installations requiring customised cable entry positions.
- Industrial control panels and distribution assemblies.
- OEM machinery and electrical equipment manufacturing.
