ABB OT400DLRR3TX 400A 3-Pole ATEX IP65 Steel Enclosed Safety Switch-Disconnector
The ABB OT400DLRR3TX is a heavy-duty 400 A, three-pole ATEX enclosed safety switch-disconnector designed for reliable electrical isolation in industrial environments where combustible dust may create an explosion hazard. Featuring a robust IP65-rated steel enclosure, ATEX II 3D classification and a padlockable operating handle, this industrial safety switch provides a practical isolation solution for appropriately classified hazardous-area installations.
Identified by ABB manufacturer reference 1SCA022839R9850, the OT400DLRR3TX belongs to ABB's OT enclosed switch-disconnector family and is classified within the 311019-Metal Enclosed (Loadbreak) product group. Its three-pole configuration enables simultaneous disconnection of three phase conductors, supporting safe maintenance and operational isolation of suitable industrial electrical equipment.
The switch is rated at 400 A under AC-23A conditions at 400 V, 500 V and 690 V AC. It also offers a substantial motor switching capability of 220 kW at 400 V AC, making it suitable for appropriately rated industrial motors and other demanding inductive loads.
Designed for hazardous-area applications involving combustible dust, the OT400DLRR3TX features an ATEX II 3D classification and a specified maximum surface temperature of 80 °C. Its IP65 enclosure provides dust-tight protection and resistance to water jets when correctly installed and sealed.
The enclosure incorporates top and bottom ring-flange cable-entry positions, a black padlockable operating handle and auxiliary contacts for compatible control and indication circuits. These features make the ABB OT400DLRR3TX suitable for demanding industrial applications where electrical isolation, environmental protection and hazardous-area equipment selection are essential.
Key Advantages
- 400 A rated operational current under AC-23A conditions at 400 V, 500 V and 690 V AC.
- Three-pole (3P) switching for coordinated isolation of three-phase electrical circuits.
- ATEX II 3D classification for appropriately classified combustible-dust hazardous areas.
- IP65 steel enclosure providing dust-tight protection and resistance to water jets.
- Maximum surface temperature of 80 °C as specified for the ATEX enclosed switch range.
- 220 kW AC-23A motor switching rating at 400 V AC.
- Suitable for demanding industrial motor and machinery isolation applications.
- Black padlockable operating handle supporting controlled maintenance isolation.
- Top and bottom cable-entry arrangements for convenient installation.
- Four ring-flange cable-entry positions per side.
- Five ring-flange covers included in the specified assembly.
- 2 normally open and 1 normally closed auxiliary contacts for compatible signalling applications.
- Robust metal enclosure suitable for industrial operating environments.
- Designed for electrical installations where combustible dust hazards must be assessed.
- ABB industrial switch-disconnector technology and established OT product family.
Key Features
- ABB OT enclosed ATEX safety switch-disconnector.
- OT400DLRR3TX model designation.
- 400 A AC-23A operational current rating.
- Three main switching poles.
- Manual ON/OFF electrical switching and isolation.
- ATEX II 3D hazardous-area classification.
- Intended for suitably assessed combustible-dust hazardous areas.
- IP65 enclosure ingress protection.
- Steel enclosure construction.
- Grey enclosure finish.
- Black operating handle.
- Padlockable handle for maintenance isolation.
- 80 °C specified maximum surface temperature.
- Top and bottom cable-entry positions.
- Ring-flange cable-entry arrangement.
- Four ring-flange positions per side.
- Five ring-flange covers included.
- 2 NO + 1 NC auxiliary contacts.
- Fixed enclosed industrial installation.
- 27 kg listed product weight.
- ABB manufacturer reference 1SCA022839R9850.
Technical Specifications
- Manufacturer: ABB
- Series: OT Enclosed Switch-Disconnectors
- Model: OT400DLRR3TX
- ABB order code: OT400DLRR3TX
- ABB manufacturer reference: 1SCA022839R9850
- Product group: 311019-Metal Enclosed (Loadbreak)
- Product type: ATEX steel enclosed safety switch-disconnector
- Rated operational current AC-23A at 400 V AC: 400 A
- Rated operational current AC-23A at 500 V AC: 400 A
- Rated operational current AC-23A at 690 V AC: 400 A
- Rated operational power AC-23A at 230 V AC: 110 kW
- Rated operational power AC-23A at 400 V AC: 220 kW
- Rated operational power AC-23A at 500 V AC: 280 kW
- Rated operational power AC-23A at 690 V AC: 355 kW
- Number of poles: 3
- Pole configuration: 3P
- Switching function: Manual loadbreak switching and isolation
- Utilisation category: AC-23A
- ATEX classification: II 3D
- Hazardous-area application: Combustible-dust environments within the applicable equipment classification
- Maximum surface temperature: 80 °C
- Ingress protection: IP65
- Enclosure material: Steel
- Enclosure colour: Grey
- Handle colour: Black
- Handle locking: Padlockable
- Operating method: Manual ON/OFF
- Cable-entry positions: Top and bottom
- Cable-entry type: Ring-flange arrangement
- Ring-flange positions: 4 per side
- Ring-flange covers included: 5
- Auxiliary contact configuration: 2 NO + 1 NC
- Product weight: 27 kg
- GTIN / EAN: 6417019293813
- Relevant switch-disconnector standard: IEC/EN 60947-3
ATEX Safety Switching for Combustible-Dust Environments
The ABB OT400DLRR3TX is specifically identified as an ATEX safety switch, making it suitable for consideration in industrial installations where combustible dust can create an explosive atmosphere.
Its ATEX II 3D classification identifies the switch as Group II, Category 3 equipment intended for dust-related hazardous atmospheres within the limits of its certified equipment marking and installation conditions.
Category 3D equipment is generally associated with Zone 22 combustible-dust applications, where an explosive dust atmosphere is not likely during normal operation and, if it occurs, is expected to persist only for a short period.
The switch must only be installed in a hazardous area where its complete equipment marking, temperature limitations, environmental ratings and installation instructions are compatible with the site-specific hazardous-area classification.
The specified maximum surface temperature of 80 °C is an important selection parameter. Electrical designers must ensure that this temperature is suitable for the ignition characteristics of the combustible dust present, taking into account dust layers and the applicable safety margins.
The IP65 enclosure helps prevent dust ingress and protects the switching assembly from water jets. Appropriate cable glands, ring flanges, seals and installation practices are essential to preserve the enclosure's protection and hazardous-area suitability.
Important: The ATEX II 3D designation does not establish suitability for explosive gas atmospheres or higher-risk dust zones. The complete manufacturer marking and applicable approval documentation must be checked before hazardous-area installation.
400A Three-Pole Loadbreak Switching and Isolation
The OT400DLRR3TX provides a 400 A AC-23A operational current rating at 400 V, 500 V and 690 V AC, making it suitable for appropriately designed industrial electrical switching applications.
The AC-23A utilisation category applies to switching motor loads and other highly inductive loads under the relevant IEC switching requirements. This distinguishes the product from isolators intended only for less demanding resistive-load switching.
Its motor power ratings include 110 kW at 230 V AC, 220 kW at 400 V AC, 280 kW at 500 V AC and 355 kW at 690 V AC.
These ratings allow electrical engineers to assess the switch against connected motor and machinery loads. Final selection must also consider motor starting conditions, operational duty, upstream protective devices and the prospective short-circuit current.
The three-pole mechanism enables coordinated disconnection of three phase conductors. Any neutral conductor and protective earth arrangement must be addressed separately in accordance with the electrical installation design.
The OT400DLRR3TX is a switch-disconnector rather than an automatic circuit breaker. It does not independently provide overload or short-circuit protection.
IP65 Steel Enclosure with Ring-Flange Cable Entries
The ABB OT400DLRR3TX is supplied in a robust grey steel enclosure designed for demanding industrial environments. Its metal construction protects the enclosed switching mechanism while providing a durable installation housing.
The enclosure incorporates top and bottom cable-entry arrangements, with four ring-flange positions per side. This allows the installer to configure appropriate cable entries for the required power and auxiliary wiring.
The specified assembly includes five ring-flange covers. Additional ring-flange components and suitable hazardous-area cable-entry accessories may need to be selected separately according to the installation requirements.
Its IP65 rating provides dust-tight protection and resistance to water jets when correctly assembled. The integrity of the enclosure depends on appropriate cable glands, seals, unused-entry closures and correct installation.
With a listed weight of 27 kg, the assembly is intended for secure fixed mounting using suitable supports and installation methods.
Padlockable Operation and Auxiliary Contact Integration
The black padlockable operating handle provides a clearly identifiable manual isolation point. Padlocking helps prevent unintended operation while authorised personnel carry out maintenance or servicing.
The switch includes a 2 NO + 1 NC auxiliary contact arrangement, allowing compatible control and indication circuits to monitor or respond to the switch position.
Auxiliary contacts may be incorporated into equipment monitoring, control interlocking or status indication arrangements, provided the circuit design complies with the manufacturer's contact ratings and hazardous-area installation requirements.
In potentially explosive atmospheres, maintenance procedures must address both electrical hazards and ignition risks. Personnel should follow the site's hazardous-area procedures and verify safe isolation before opening or working on electrical equipment.
Typical Applications
- Industrial electrical isolation in appropriately classified ATEX dust environments.
- Zone 22 combustible-dust installations where the complete equipment marking permits use.
- Grain handling and processing facilities.
- Flour milling and bulk powder handling equipment.
- Food processing installations with combustible-dust hazards.
- Industrial dust extraction and collection systems.
- Woodworking and timber processing facilities.
- Chemical powder handling installations.
- Bulk material conveyors and handling machinery.
- Industrial motor isolation within the applicable AC-23A ratings.
- Manufacturing and processing equipment.
- Maintenance isolation points in hazardous-area installations.
- Applications requiring a 400 A three-pole ATEX steel enclosed safety switch.
