Why Choose the ABB OTP75T3MX 75 A 3-Pole ATEX Enclosed Safety Switch?
The ABB OTP75T3MX is a 3-pole ATEX plastic enclosed safety switch-disconnector designed for local electrical isolation of industrial machinery, motors and equipment in suitable potentially explosive dust atmospheres. Part of the ABB OTP enclosed safety switch range, it combines manual isolation functionality with an IP65 protective enclosure and an ATEX classification for specified hazardous-area applications.
Featuring ATEX Ex II 3D classification, an IP65-rated plastic enclosure and threaded metric cable knock-outs, the OTP75T3MX is designed for applications requiring an appropriately classified enclosed switching device. Its black operating handle is padlockable, while the enclosure includes a neutral terminal, protective earth terminal and one normally open auxiliary contact.
Identified by ABB manufacturer product ID 1SCA022839R8880 and order code OTP75T3MX, the switch provides an 80 A AC-23A operational current rating at 400 V AC and a 37 kW motor switching capability at 400 V AC. Its three-pole switching arrangement, 70 mm² terminal capacity and 2 × M50 + M16 cable entry configuration per side make it suitable for appropriately designed industrial electrical isolation systems.
Key Advantages
- ATEX Ex II 3D classification for suitable potentially explosive dust atmospheres.
- 3-pole safety switch-disconnector for industrial three-phase electrical isolation.
- 80 A AC-23A operational current rating at 400 V AC.
- 37 kW AC-23A motor switching capability at 400 V AC.
- IP65-rated plastic enclosure provides protection against dust ingress and low-pressure water jets.
- Maximum specified surface temperature of 60 °C under the applicable ATEX conditions.
- Black padlockable operating handle supports controlled maintenance isolation.
- Threaded metric cable knock-outs allow top and bottom cable entry.
- 2 × M50 + M16 cable openings per side support power and auxiliary wiring.
- 70 mm² terminal capacity accommodates suitable power conductors.
- One normally open auxiliary contact included for compatible indication and control circuits.
- Neutral and protective earth terminals support electrical installation.
- Suitable for appropriately classified industrial dust-handling and processing environments.
Key Features
- ABB OTP75T3MX ATEX enclosed safety switch.
- 3-pole main switching configuration.
- ATEX equipment classification: Ex II 3D.
- Maximum specified surface temperature: 60 °C.
- IP65 enclosure protection rating.
- 80 A AC-23A at 400 V AC.
- 60 A AC-23A at 500 V AC.
- 40 A AC-23A at 690 V AC.
- 37 kW AC-23A motor output at 400 V AC.
- 37 kW AC-23A motor output at 690 V AC.
- Black manual operating handle.
- Padlockable isolation mechanism.
- One normally open auxiliary contact included.
- Neutral and protective earth terminals included.
- 2 × M50 + M16 threaded knock-out cable openings per side.
- 70 mm² terminal conductor capacity.
- 400 × 200 × 140 mm enclosure dimensions.
Technical Specifications
- Manufacturer: ABB
- Series: OTP Enclosed Safety Switches
- Model: OTP75T3MX
- ABB order code: OTP75T3MX
- ABB manufacturer product ID: 1SCA022839R8880
- Product group: 311004 – Plastic Enclosed Switches (OTP)
- Product type: ATEX plastic enclosed safety switch-disconnector
- Product current designation: 75 A
- Number of poles: 3
- ATEX classification: Ex II 3D
- Maximum specified surface temperature: 60 °C
- Enclosure protection rating: IP65
- Rated operational current AC-23A at 400 V AC: 80 A
- Rated operational current AC-23A at 500 V AC: 60 A
- Rated operational current AC-23A at 690 V AC: 40 A
- Maximum motor output AC-23A at 230 V: 22 kW
- Maximum motor output AC-23A at 400 V: 37 kW
- Maximum motor output AC-23A at 500 V: 37 kW
- Maximum motor output AC-23A at 690 V: 37 kW
- Enclosure material: Plastic
- Enclosure colour: Grey
- Operating handle colour: Black
- Operating method: Manual ON/OFF switching
- Handle locking: Padlockable
- Auxiliary contacts included: 1 NO
- Maximum auxiliary contact configuration: 2 NO + 2 NC
- Neutral terminal: Included
- Protective earth terminal: Included
- Cable entry type: Threaded metric knock-outs
- Cable entry configuration: 2 × M50 + M16 per side
- Cable entry positions: Top and bottom
- Specified terminal capacity: 70 mm²
- Enclosure height: 400 mm
- Enclosure width: 200 mm
- Enclosure depth: 140 mm
- Dimensions (H × W × D): 400 × 200 × 140 mm
- Catalogue weight: 2.4 kg
ATEX Electrical Isolation for Industrial Machinery and Dust-Handling Environments
The ABB OTP75T3MX provides a local means of disconnecting electrical machinery and equipment from its power supply in installations requiring a suitably classified ATEX switching device. Its Ex II 3D classification identifies it as Category 3 equipment for explosive dust atmospheres, typically associated with Zone 22 applications when the complete installation and environmental conditions satisfy the applicable requirements.
The switch's three-pole arrangement enables simultaneous disconnection of three phase conductors in compatible electrical systems. With an 80 A AC-23A operational current rating at 400 V AC, it is suitable for appropriately rated industrial motor and inductive-load switching applications. The included normally open auxiliary contact can be incorporated into compatible signalling or control circuits.
The IP65 enclosure provides protection against dust ingress and low-pressure water jets when correctly installed. Threaded M50 and M16 cable knock-outs allow suitable cable entry arrangements, although cable glands must be selected separately and must preserve the required environmental protection and hazardous-area suitability.
ATEX equipment selection requires assessment of the hazardous-area zone, dust characteristics, ignition temperature, maximum surface temperature and applicable installation standards. The OTP75T3MX must not be assumed suitable for every explosive atmosphere, particularly gas hazardous areas or dust zones requiring a higher equipment category. Appropriate upstream circuit protection and electrical isolation procedures must also be provided.
Typical Applications
- Electrical isolation in appropriately classified ATEX Zone 22 installations.
- Industrial dust extraction and collection equipment.
- Powder handling and processing machinery.
- Grain handling and agricultural processing equipment.
- Industrial conveying systems handling combustible dusts.
- Food processing machinery in suitably classified dust environments.
- Woodworking and timber processing facilities.
- Industrial mixing and blending equipment.
- Packaging machinery in dust-generating processes.
- Industrial fans, pumps and motors requiring local isolation.
- Maintenance isolation points in appropriately classified hazardous areas.
- OEM machinery and industrial electrical installations requiring suitable ATEX equipment.
