OT400FP-A ABB 400A 4-Pole IP65 Steel Enclosed Switch-Disconnector

Why Choose the ABB OT400FP-A 400A 4-Pole IP65 Steel Enclosed Switch-Disconnector?

The ABB OT400FP-A is a heavy-duty 400 A, 4-pole steel enclosed switch-disconnector designed for reliable manual electrical switching and isolation in industrial and commercial low-voltage installations. Part of ABB's established OT enclosed load-break switch range, it combines high-current switching capability with a durable mild steel enclosure, IP65 ingress protection and a practical padlockable operating handle.

Designed for demanding electrical distribution applications, the ABB OT400FP-A enclosed isolator provides simultaneous manual operation of four switching poles. This makes it suitable for appropriately engineered three-phase systems where the installation requires four conductors to be switched together, including applications involving a switched neutral.

The switch is housed in a RAL 7035 light grey, powder-coated steel enclosure measuring 500 mm high × 400 mm wide × 200 mm deep. It features a hinged enclosure door with a double-bit locking arrangement, removable gland plates at the top and bottom, and an externally accessible pistol-grip operating handle.

With its IP65 protection rating, robust steel construction and convenient cable-entry arrangement, the OT400FP-A is a practical solution for electrical contractors, industrial maintenance engineers, panel builders and equipment manufacturers requiring a complete enclosed 400 A switch-disconnector.

Key Advantages

• 400 A current rating for substantial industrial and commercial electrical loads.
• Four-pole switching configuration for coordinated manual operation of four conductors.
• IP65-rated steel enclosure provides protection against dust ingress and water jets when correctly installed.
• Durable mild steel construction offers mechanical protection in industrial electrical environments.
• RAL 7035 light grey powder-coated finish provides a professional, durable enclosure surface.
• Padlockable pistol-grip handle supports controlled electrical isolation procedures.
• Clear ON/OFF operation allows straightforward identification of the switching position.
• Hinged enclosure door provides practical access for authorised installation and maintenance.
• Double-bit door lock helps restrict casual access to internal electrical components.
• Removable top and bottom gland plates allow flexible cable-entry preparation.
• Surface-mounted design supports installation on suitable walls or mounting structures.
• Complete enclosed switch-disconnector reduces the need to separately specify a switch mechanism and enclosure.
• Non-fused construction provides manual load-break switching without integrated fuse protection.
• Compact high-current enclosure measuring 500 × 400 × 200 mm.
• Genuine ABB OT equipment with clearly identifiable manufacturer order code.
• Suitable for industrial maintenance isolation when incorporated into a correctly designed electrical installation.

Key Features

• Manufacturer: ABB.
• Model: OT400FP-A.
• ABB order code: OT400FP-A.
• Product range: ABB OT.
• Product type: Steel enclosed switch-disconnector.
• Rated current: 400 A.
• Number of poles: 4.
• Switching function: Manual ON/OFF load-break switching.
• Fuse arrangement: Non-fused.
• Enclosure material: Mild steel.
• Enclosure finish: Powder-coated.
• Enclosure colour: RAL 7035 light grey.
• Ingress protection: IP65.
• Operating handle: Pistol-grip type.
• Handle padlocking: Yes.
• Enclosure door: Hinged.
• Door locking arrangement: Double-bit lock.
• Cable-entry arrangement: Removable gland plates.
• Cable-entry positions: Top and bottom.
• Mounting method: Surface mounting.
• Enclosure height: 500 mm.
• Enclosure width: 400 mm.
• Enclosure depth: 200 mm.
• Product classification: ABB 311019 – Metal Enclosed (Loadbreak).

Technical Specifications

• Manufacturer: ABB
• Brand: ABB
• Product series: OT Enclosed Switch-Disconnectors
• Model number: OT400FP-A
• ABB order code: OT400FP-A
• ABB product group: 311019 – Metal Enclosed (Loadbreak)
• Product description: 400A 4P Steel Enclosed Switch-Disconnector IP65
• Product category: Enclosed load-break switch
• Product type: Manual switch-disconnector
• Rated current: 400 A
• Number of switching poles: 4
• Switching positions: ON / OFF
• Changeover switching: No
• Integrated fuses: No
• Automatic overload tripping: No
• Automatic short-circuit tripping: No
• Enclosure material: Mild steel
• Enclosure surface finish: Powder-coated textured finish
• Enclosure colour: RAL 7035 light grey
• Ingress protection rating: IP65
• Operating method: Manual
• Operating handle: Pistol grip
• Handle padlocking: Yes
• Enclosure access: Hinged door
• Door lock: Double-bit locking arrangement
• Cable-entry positions: Top and bottom
• Cable-entry arrangement: Removable gland plates
• Mounting type: Surface mounting
• Enclosure height: 500 mm
• Enclosure width: 400 mm
• Enclosure depth: 200 mm
• Dimensions (H × W × D): 500 × 400 × 200 mm
• Compatible spreader box reference: ABB SRN5420K, subject to installation requirements
• Compatible spreader box gasket reference: ABB GZ4020
• Wall mounting bracket reference: ABB AA1206
• Primary application: Manual switching and electrical isolation
• Associated equipment: Industrial and commercial low-voltage electrical installations

Reliable 400A Electrical Isolation for Industrial Power Distribution

The ABB OT400FP-A is designed to provide a dependable manual switching point in installations carrying substantial electrical loads. Its 400 A current rating makes it relevant to industrial distribution systems, machinery supplies and other suitably rated low-voltage electrical circuits.

Unlike a circuit breaker, the OT400FP-A is a manually operated switch-disconnector. Its purpose is to connect or disconnect the supply through a mechanical switching action, rather than automatically detect and clear electrical faults.

The switch can therefore form part of a properly engineered electrical isolation arrangement, provided that suitable overload and short-circuit protection is installed elsewhere in the system.

The applicable operating voltage, utilisation category, load characteristics and short-circuit coordination must be verified against ABB's technical documentation before installation. The nominal 400 A rating alone does not establish suitability for every switching duty.

Four-Pole Switching for Three-Phase Electrical Systems

The four-pole configuration of the ABB OT400FP-A enables four main conductors to be switched through one operating mechanism.

In suitable three-phase installations, this may allow the three phase conductors and a neutral conductor to be switched together. This can be useful where the electrical design requires a four-pole isolator rather than a three-pole switch with an unswitched neutral link.

The correct neutral-switching arrangement depends on the supply earthing system, applicable wiring regulations and the intended electrical application.

Important: The protective earth conductor must not be interrupted by the switch. Earthing and bonding arrangements must be maintained in accordance with the electrical installation design.

The OT400FP-A is a four-pole ON/OFF switch-disconnector, not a changeover switch. It does not provide the I–O–II operating positions required for manual selection between two separate electrical supplies.

IP65 Steel Enclosure for Demanding Indoor Installations

The OT400FP-A is housed in a powder-coated mild steel enclosure finished in RAL 7035 light grey.

Steel construction provides mechanical protection for the internal switch-disconnector and its power connections, while the powder-coated finish offers a durable surface suitable for many industrial electrical environments.

The enclosure has an IP65 ingress protection rating, indicating protection against dust ingress and water jets when the complete assembly is correctly installed.

ABB's UK enclosed load-break switch catalogue identifies this steel-enclosed IP65 range as not suitable for external installation. The OT400FP-A should therefore not be assumed suitable for exposed outdoor use solely because it has an IP65 rating.

Where outdoor installation is required, a suitably specified enclosure arrangement or an alternative product explicitly approved for the environmental conditions should be selected.

IP65 protection must also be maintained through appropriate cable glands, seals, gland plate preparation and enclosure assembly.

Padlockable Pistol-Grip Handle for Controlled Isolation

The ABB OT400FP-A is fitted with a pistol-grip operating handle designed for straightforward manual ON/OFF switching.

The handle is padlockable, allowing it to be incorporated into suitable lockout and maintenance isolation procedures.

This feature is valuable in industrial environments where machinery or electrical equipment must remain isolated while authorised personnel perform maintenance or servicing.

The operating handle provides a clearly identifiable external control point, reducing the need for routine access to the enclosure interior.

Padlocking must be used as part of a complete safe isolation procedure. Before work begins, the electrical supply must be isolated, secured against reconnection and verified dead in accordance with the relevant safety requirements.

Hinged Door and Double-Bit Lock

The OT400FP-A features a hinged steel enclosure door with a double-bit locking arrangement.

This provides convenient access for authorised installation, inspection and maintenance while helping prevent casual access to internal electrical components.

The hinged door is particularly practical for a high-current enclosure because it allows the cover to remain attached to the assembly during access.

Before opening the enclosure, authorised personnel must follow the required electrical isolation procedures. The presence of a door lock does not establish that internal conductors are de-energised.

Removable Top and Bottom Gland Plates

The ABB OT400FP-A is supplied with removable gland plates at the top and bottom of the enclosure.

This arrangement gives installers flexibility when preparing cable entries for incoming and outgoing power cables.

The gland plates can be prepared for appropriately selected cable glands, allowing the cable-entry layout to be matched to the installation requirements.

Correct cable gland selection must consider conductor size, cable outside diameter, gland material, mechanical retention and the required environmental protection.

Any openings made in the gland plates must be correctly finished and sealed. The completed cable-entry arrangement must preserve the enclosure's IP65 protection.

For installations requiring additional cable termination space, ABB identifies compatible spreader box accessories within its enclosed switch range. These should be selected according to the applicable enclosure and installation requirements.

Compact 500 × 400 × 200mm Enclosure

The OT400FP-A measures 500 mm high × 400 mm wide × 200 mm deep.

These dimensions make it possible to plan the mounting position, cable routing and operating clearances before installation.

The switch is intended for surface mounting on a suitable wall or support structure.

When planning the installation, allowance should be made for cable bending radii, conductor termination space, gland plate access, door opening clearance and convenient operation of the handle.

Mounting hardware and structural support should be selected according to the complete equipment weight and the requirements of the installation.

Non-Fused Switch-Disconnector Versus Switch Fuse

The ABB OT400FP-A is a non-fused switch-disconnector.

This means that the product provides manual switching and isolation but does not contain integrated fuse links for circuit protection.

A switch fuse incorporates fuse protection alongside its switching function. A non-fused switch-disconnector such as the OT400FP-A instead relies on appropriately selected protective devices elsewhere in the installation.

Engineers must ensure that the protective devices, conductor sizes, switch ratings and prospective fault current are properly coordinated.

The OT400FP-A should not be described as an automatic circuit breaker, motor protection device or fused switch.

Typical Applications

• Industrial power distribution: Manual isolation of appropriately rated high-current electrical supplies.
• Commercial electrical installations: Enclosed switching for suitable three-phase distribution circuits.
• Four-pole isolation: Applications requiring simultaneous switching of four conductors.
• Industrial machinery: Local or main electrical isolation for suitable equipment.
• Manufacturing facilities: Manual switching of production and processing machinery supplies.
• Electrical plant rooms: Enclosed load-break switching for industrial distribution equipment.
• Motor supply isolation: Manual disconnection of appropriately rated motor circuits.
• Industrial maintenance: Supporting controlled isolation before servicing electrical equipment.
• OEM equipment: Integration into engineered electrical machinery installations.
• Distribution system upgrades: Replacement of compatible enclosed switch-disconnectors.
• Building services: Isolation of suitable high-current electrical plant.
• Electrical contracting: Installation of complete steel enclosed switching assemblies.
• Panel-building projects: Providing a separate surface-mounted isolation point for suitable circuits.