Why Choose the ABB OTP63T3MX 3-Pole 63A ATEX Enclosed Safety Switch?
The ABB OTP63T3MX (1SCA022839R8700) is a 3-pole, 63 A ATEX plastic enclosed safety switch-disconnector designed for manual electrical switching and isolation in industrial environments where combustible dust may create an explosive atmosphere. Part of the ABB OTP range, this specialist enclosed switch combines a protective plastic housing, black selector operating handle and metric cable-entry knockouts.
The OTP63T3MX is specified for ATEX equipment category II 3D applications, with an IP65 enclosure and a stated maximum surface temperature of 60 °C. It provides a rated operational current of 63 A under AC-23A conditions at 400 V AC, together with a 30 kW motor switching rating at the same voltage. These characteristics make it suitable for appropriately engineered industrial motor and electrical isolation applications in designated dust-hazardous environments.
The switch is housed in a grey polycarbonate plastic enclosure measuring 200 × 145 × 90 mm. It features a black, padlockable selector handle, one included normally open auxiliary contact, neutral and protective earth connections, and 2 × M32 + M16 metric cable-entry knockouts per side. The enclosure and switching assembly provide a practical solution for industrial installations requiring both electrical isolation and suitable equipment selection for ATEX-designated dust areas.
Key Advantages
- ATEX II 3D equipment designation for appropriately assessed dust-hazardous environments.
- 3-pole switching configuration for simultaneous disconnection of three electrical conductors.
- 63 A AC-23A operational current rating at 400 V AC.
- 30 kW AC-23A motor switching capability at 400 V AC.
- IP65 enclosure protection against dust ingress and water jets when correctly installed.
- Maximum specified surface temperature of 60 °C under the applicable ATEX conditions.
- Grey polycarbonate enclosure designed for industrial electrical installations.
- Black selector operating handle with clear ON/OFF indication.
- Padlockable operation supporting controlled maintenance isolation procedures.
- One normally open auxiliary contact included for compatible indication and control circuits.
- Neutral and protective earth terminals included for suitable wiring arrangements.
- Metric cable-entry knockouts allow the installation of appropriately selected cable glands.
- Top and bottom cable-entry positions provide flexibility when routing incoming and outgoing cables.
- Compact enclosed construction suitable for industrial machinery and electrical distribution applications.
- ABB switch-disconnector design for reliable manual switching and isolation.
Key Features
- Manufacturer: ABB.
- Model: OTP63T3MX.
- ABB order code: OTP63T3MX.
- Manufacturer identification number: 1SCA022839R8700.
- Product series: ABB OTP.
- Product type: ATEX enclosed safety switch-disconnector.
- Number of poles: 3.
- Rated operational current AC-23A at 400 V AC: 63 A.
- Rated operational current AC-23A at 500 V AC: 50 A.
- Rated operational current AC-23A at 690 V AC: 35 A.
- Rated motor switching power AC-23A at 400 V AC: 30 kW.
- Rated motor switching power AC-23A at 500 V AC: 30 kW.
- Rated motor switching power AC-23A at 690 V AC: 30 kW.
- Conventional enclosed thermal current: 80 A.
- ATEX equipment designation: II 3D.
- Maximum specified surface temperature: 60 °C.
- Enclosure material: Polycarbonate plastic.
- Enclosure colour: Grey.
- Ingress protection: IP65.
- Handle type: Rotary selector.
- Handle colour: Black.
- Handle locking: Padlockable.
- Auxiliary contact supplied: 1 normally open (1 NO).
- Maximum auxiliary contact configuration: 2 NO + 2 NC.
- Neutral terminal: Included.
- Protective earth terminal: Included.
- Cable-entry knockouts: 2 × M32 + M16 per side.
- Enclosure dimensions: 200 × 145 × 90 mm.
- Net weight: Approximately 1.0 kg.
Technical Specifications
- Manufacturer: ABB
- Product series: OTP Plastic Enclosed Switches
- Model: OTP63T3MX
- Manufacturer part number: 1SCA022839R8700
- ABB order code: OTP63T3MX
- ABB product group: 311004 – Plastic Enclosed Switches (OTP)
- Product description: 3P 63A ATEX Plastic Enclosed Switch with Knockouts IP65
- Product type: ATEX enclosed switch-disconnector
- Number of main poles: 3
- ATEX equipment group and category: II 3D
- Hazardous atmosphere type: Combustible dust
- Maximum specified surface temperature: 60 °C
- Rated operational current AC-23A at 400 V: 63 A
- Rated operational current AC-23A at 500 V: 50 A
- Rated operational current AC-23A at 690 V: 35 A
- Rated operational current AC-22A: 63 A
- Rated operational power AC-23A at 230 V: 18.5 kW
- Rated operational power AC-23A at 400 V: 30 kW
- Rated operational power AC-23A at 500 V: 30 kW
- Rated operational power AC-23A at 690 V: 30 kW
- Conventional thermal current, fully enclosed: 80 A
- Rated operational voltage, main circuit: 750 V
- Enclosure material: Polycarbonate plastic
- Enclosure colour: Grey
- Enclosure protection rating: IP65
- Operating handle type: Selector-type rotary handle
- Operating handle colour: Black
- Handle padlocking: Yes
- Operating position indication: I–O / ON–OFF
- Auxiliary contacts included: 1 NO
- Maximum auxiliary contact configuration: 2 NO + 2 NC
- Neutral terminal: Included
- Protective earth terminal: Included
- Main conductor connection capacity: Up to 35 mm²
- Cable-entry type: Metric threaded knockouts
- Cable-entry positions: Top and bottom
- Cable-entry knockouts per side: 2 × M32 + M16
- Cable glands: Ordered separately
- Enclosure height: 200 mm
- Enclosure width: 145 mm
- Enclosure depth: 90 mm
- Dimensions (H × W × D): 200 × 145 × 90 mm
- Net weight: Approximately 1.0 kg
- EAN: 6417019293707
- Product classification: ATEX plastic enclosed safety switch
- Applicable installation requirements: Relevant low-voltage electrical and hazardous-area installation standards
ATEX Electrical Isolation for Dust-Hazardous Industrial Environments
The ABB OTP63T3MX is designed for industrial installations where electrical equipment must be selected with consideration for potentially explosive dust atmospheres. Its ATEX II 3D designation identifies equipment intended for relevant Group II dust applications, subject to the installation's hazardous-area classification and the exact conditions specified by the manufacturer.
ATEX equipment category 3D is generally associated with Zone 22 combustible-dust environments. However, the suitability of the OTP63T3MX must be confirmed against the actual dust properties, ignition temperature, ambient conditions, equipment marking and installation requirements. The II 3D designation must not be interpreted as approval for every hazardous atmosphere or for gas-hazardous zones.
The OTP63T3MX has a specified maximum surface temperature of 60 °C under the applicable conditions. This is particularly relevant in dust-hazardous environments, where the maximum temperature of exposed equipment surfaces must be assessed against the ignition characteristics of the combustible dust present.
For electrical switching duties, the OTP63T3MX provides a 63 A AC-23A operational current rating at 400 V AC and a corresponding 30 kW motor switching rating. At 500 V AC, its AC-23A operational current rating is 50 A, while at 690 V AC it is 35 A. These ratings allow the switch to be selected according to the supply voltage and switching duty.
The three-pole switching mechanism enables simultaneous manual disconnection of three main conductors through a single external selector handle. The black operating handle provides clear ON/OFF indication and can be padlocked to support controlled maintenance isolation procedures.
The grey IP65 polycarbonate enclosure protects the switching mechanism against dust ingress and water jets when correctly installed. Its top and bottom metric cable-entry knockouts allow suitable cable glands to be selected for the installation. In hazardous areas, the glands, unused-entry closures and complete cable-entry arrangement must also satisfy the applicable protection requirements.
The OTP63T3MX includes one normally open auxiliary contact for compatible control or indication circuits. A neutral terminal and protective earth connection are also provided. Any additional auxiliary components must be compatible with the switch and appropriate for the complete hazardous-area installation.
Although described as a safety switch, the OTP63T3MX is a manual switch-disconnector, not an automatic circuit breaker or motor overload relay. It does not independently provide automatic overload or short-circuit tripping. Suitable protective devices must be incorporated into the electrical installation.
Important ATEX selection note: The OTP63T3MX should only be installed in a hazardous area after confirming its complete ATEX marking, certification documentation, installation instructions and suitability for the site's zone classification and combustible-dust conditions. Installation and maintenance should be performed by personnel competent in hazardous-area electrical systems.
Typical Applications
- ATEX Zone 22 installations: Manual isolation in suitably assessed combustible-dust environments.
- Industrial dust-handling equipment: Electrical switching for appropriately rated machinery in designated dust-hazardous areas.
- Bulk material processing: Isolation of suitable equipment in installations handling combustible powders or particulates.
- Grain-handling facilities: Switching of compatible machinery where the hazardous-area assessment permits the equipment category.
- Food-processing machinery: Manual electrical isolation in suitably classified dust environments.
- Woodworking and timber processing: Isolation of compatible equipment in areas where combustible wood dust may be present.
- Powder-handling installations: Providing enclosed switching for suitable motor and machinery circuits.
- Industrial motor isolation: Disconnecting appropriately rated three-phase motor supplies.
- Machinery maintenance: Supporting controlled electrical isolation before servicing equipment.
- Industrial electrical distribution: Providing manual switching of suitable low-voltage circuits.
- OEM equipment: Integrating an ATEX-designated enclosed switch into appropriately engineered machinery.
- Hazardous-area equipment upgrades: Replacing compatible switches where the electrical ratings and hazardous-area requirements are satisfied.
