Why Choose the ABB OTP75A3B 37kW 3-Pole IP65 Enclosed Safety Switch?
The ABB OTP75A3B (1SCA022382R0550) is a robust 37 kW three-pole plastic enclosed safety switch-disconnector designed for reliable local electrical isolation of industrial motors, machinery and three-phase equipment. Part of the ABB OTP enclosed safety switch range, it combines dependable manual switching, a highly visible red/yellow operating handle and an I-flange cable entry arrangement for flexible installation.
Designed for demanding industrial applications, the OTP75A3B provides a 37 kW AC-23A motor switching capability at 400 V AC, with a corresponding 80 A operational current rating at 380–415 V AC. Its three-pole switching mechanism allows the three phase conductors to be disconnected together, supporting machinery maintenance, inspection and electrical isolation procedures.
The switch is housed in a UV-protected, glass-fibre-reinforced polycarbonate enclosure with an IP65 protection rating. Its distinctive red/yellow selector handle provides clear ON/OFF operation and can accommodate up to three padlocks in the OFF position. The enclosure cover incorporates a mechanical interlock, helping control access to internal switching components.
A distinguishing feature of the OTP75A3B is its I-flange cable entry arrangement, with cable entry provisions at the top and bottom of the enclosure. Compatible I-flanges are selected separately to suit the installation. The switch also includes one normally open (1NO) auxiliary contact, fixed neutral and protective earth terminals, and a surface-mounted enclosure measuring 400 × 200 × 140 mm.
Key Advantages
- 37 kW AC-23A motor switching capability at 400 V AC for suitable industrial motor loads.
- Three-pole switching configuration enables simultaneous disconnection of three phase conductors.
- 80 A AC-23A operational current at 380–415 V AC supports demanding machinery applications.
- Red/yellow selector handle provides highly visible identification of the local safety isolation point.
- Padlockable OFF position accommodates up to three padlocks for controlled maintenance isolation.
- IP65-rated enclosure provides protection against dust ingress and water jets when correctly installed.
- UV-protected, glass-fibre-reinforced polycarbonate housing supports appropriately designed indoor and outdoor installations.
- I-flange cable entry arrangement provides flexibility for selecting suitable cable entry accessories.
- Top and bottom cable entry provisions simplify cable routing around machinery.
- Integrated 1NO auxiliary contact supports switch-position indication and control circuit interlocking.
- Mechanically interlocked enclosure cover helps control access while the switch is energised.
- Fixed neutral and protective earth terminals support convenient installation in suitable electrical systems.
- Surface-mounted construction allows installation close to motors, machinery and electrical equipment.
Key Features
- ABB OTP enclosed safety switch series.
- 37 kW maximum AC-23A motor output at 400 V AC.
- 37 kW maximum AC-23A motor output at 500 V AC.
- 37 kW maximum AC-23A motor output at 690 V AC.
- 22 kW maximum AC-23A motor output at 230 V AC.
- Three-pole (3P) main switching configuration.
- 80 A AC-23A operational current at 380–415 V AC.
- 60 A AC-23A operational current at 500 V AC.
- 40 A AC-23A operational current at 690 V AC.
- 100 A AC-22A operational current at 500–690 V AC.
- Manual I-O / ON-OFF operation.
- Red/yellow selector-type operating handle.
- Padlockable OFF position for up to three padlocks.
- Interlocked enclosure cover with an authorised defeat facility.
- IP65 enclosure protection rating.
- UV-protected glass-fibre-reinforced polycarbonate enclosure.
- I-flange cable entry provisions at the top and bottom.
- One normally open (1NO) auxiliary contact fitted.
- Maximum auxiliary contact configuration of 2NO + 2NC using compatible accessories.
- Fixed neutral and protective earth terminals.
- Surface-mounted, front-operated construction.
- 400 × 200 × 140 mm enclosure dimensions.
Technical Specifications
- Manufacturer: ABB
- Series: OTP Enclosed Safety Switches
- Switch series: OT75
- Model: OTP75A3B
- ABB order code: OTP75A3B
- ABB product ID: 1SCA022382R0550
- ABB product group: 311004-Plastic Enclosed Switches (Otp)
- Product type: Plastic enclosed safety switch-disconnector
- Rated motor power AC-23A at 230 V AC: 22 kW
- Rated motor power AC-23A at 400 V AC: 37 kW
- Rated motor power AC-23A at 500 V AC: 37 kW
- Rated motor power AC-23A at 690 V AC: 37 kW
- Number of poles: 3
- Switching positions: I-O / ON-OFF
- Operating mechanism: Manual rotary selector
- Rated operational current AC-23A at 380–415 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
- Rated operational current AC-22A at 500 V AC: 100 A
- Rated operational current AC-22A at 690 V AC: 100 A
- Conventional enclosed thermal current (Ithe): 80 A
- Rated uninterrupted current (Iu): 115 A
- Rated operational voltage: 750 V AC
- Auxiliary contacts fitted: 1NO + 0NC
- Maximum auxiliary contact configuration: 2NO + 2NC
- Handle type: Selector-type rotary handle
- Handle colour: Red/yellow
- Handle padlocking: Up to 3 padlocks in the OFF position
- Cover interlock: Mechanically interlocked, with authorised defeat facility
- Enclosure material: UV-protected glass-fibre-reinforced polycarbonate
- Enclosure protection rating: IP65
- Mounting type: Surface mounting
- Operating direction: Front operation
- Cable entry type: I-flange arrangement
- Cable entry positions: Top and bottom
- Compatible I-flanges: Selected separately according to installation requirements
- Main circuit terminal type: Screw clamp
- Maximum listed conductor cross-section: 70 mm²
- Neutral terminal: Fixed neutral terminal included
- Protective earth terminal: Included
- Enclosure height: 400 mm
- Enclosure width: 200 mm
- Enclosure depth: 140 mm
- Dimensions (H × W × D): 400 × 200 × 140 mm
- Net weight: 2.4 kg
- EAN / GTIN: 6417019124643
- Country of origin: Finland
- Applicable product standard: IEC 60947-3
- ABB catalogue reference: 1SCC340006C0201
Dependable Three-Phase Machinery Isolation with I-Flange Cable Entries
The ABB OTP75A3B provides a clearly identifiable local isolation point for industrial machinery and motor-driven equipment. Its three-pole switch-disconnector mechanism allows the three phase conductors to be opened together, supporting electrical isolation procedures during servicing, inspection and repair. The fixed neutral and protective earth terminals provide separate connection facilities, while the protective earth conductor must remain continuous.
The red/yellow operating handle offers clear visual identification of the switch and its operating position. It can be secured in the OFF position using up to three padlocks, helping prevent unintended re-energisation during maintenance. The mechanically interlocked enclosure cover also helps control access to internal components, with an authorised defeat facility provided for procedures permitted by ABB.
The integrated 1NO auxiliary contact allows the switch to be incorporated into appropriately designed control circuits. It can provide switch-position signalling or assist with machinery control interlocking. Compatible additional auxiliary contacts may be installed where required, subject to the maximum supported configuration of 2NO + 2NC.
The IP65-rated, UV-protected polycarbonate enclosure protects the internal switching mechanism against dust and water jets when correctly installed. Its rigid glass-fibre-reinforced construction supports industrial use, including appropriately designed outdoor applications. Environmental suitability depends on correct mounting, sealing and cable entry arrangements.
A key installation advantage is the I-flange cable entry system. Unlike the OTP75A3M variant, which uses metric threaded knockouts, the OTP75A3B provides I-flange openings at the top and bottom. This allows compatible flange accessories to be selected according to the cable sizes and installation layout. I-flange accessories must be ordered separately, and the chosen fittings must maintain the required enclosure protection rating.
The OTP75A3B is a switch-disconnector rather than an automatic circuit protection device. It does not replace a circuit breaker, fuse or motor overload relay. Suitable upstream short-circuit and overload protection must therefore be incorporated into the electrical installation, with the switch selected according to its operational current, voltage and utilisation-category ratings.
Typical Applications
- Local isolation of three-phase industrial motors.
- 37 kW motor switching applications at 400 V AC.
- Industrial machinery maintenance isolation points.
- Conveyor and material handling equipment.
- Manufacturing and production machinery.
- Industrial pumps and pumping stations.
- Fans, ventilation and extraction systems.
- Heating, ventilation and air conditioning machinery.
- Packaging and processing equipment.
- Water treatment and wastewater processing installations.
- Industrial plant rooms and maintenance facilities.
- Commercial building services equipment.
- OEM machinery and industrial control systems.
- Installations requiring I-flange cable entry arrangements.
- Indoor and appropriately designed outdoor machinery isolation points.
