Why Choose the ABB OTP75A4M 37kW 4-Pole IP65 Enclosed Safety Switch?
The ABB OTP75A4M (1SCA022812R3780) is a robust 37 kW four-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 switching performance with a durable enclosure and a highly visible red/yellow operating handle.
With a 37 kW AC-23A motor switching rating at 415 V AC and a corresponding 80 A operational current rating, the OTP75A4M is suitable for demanding industrial applications involving motors and other inductive loads. Its four-pole switching configuration enables simultaneous disconnection of four conductors, making it particularly useful where three-phase and neutral isolation is required by the electrical installation design.
The switch features an IP65-rated, UV-protected, glass-fibre-reinforced polycarbonate enclosure and a distinctive red/yellow selector handle. The handle can accommodate up to three padlocks in the OFF position, while the interlocked enclosure cover helps control access to the internal switching components. These features make the OTP75A4M suitable for local machinery isolation in industrial and commercial environments.
Designed for straightforward installation, the enclosure provides two M50 cable entry knockouts and one M16 control cable entry knockout at both the top and bottom. The switch also includes one normally open (1NO) auxiliary contact, neutral and protective earth terminals, and a surface-mounted enclosure measuring 400 × 200 × 140 mm.
Key Advantages
- 37 kW motor switching capability at 415 V AC under AC-23A conditions.
- Four-pole switching configuration for simultaneous isolation of four conductors.
- 80 A AC-23A operational current rating at 415 V AC.
- Red/yellow operating handle provides clear identification of the local safety isolation point.
- Padlockable OFF position accommodates up to three padlocks for controlled maintenance isolation.
- IP65 enclosure protection against dust ingress and water jets when correctly installed.
- UV-protected, glass-fibre-reinforced polycarbonate enclosure suitable for appropriately installed indoor and outdoor applications.
- Integrated 1NO auxiliary contact for switch-position signalling or control circuit interlocking.
- Mechanically interlocked enclosure cover with an authorised defeat facility.
- Two M50 and one M16 cable entry provisions per side support power and control cable routing.
- Neutral and protective earth terminals included for convenient electrical installation.
- Surface-mounted construction provides an accessible local isolation point near machinery.
- ABB industrial switching technology designed for dependable manual operation.
Key Features
- ABB OTP plastic enclosed safety switch series.
- 37 kW AC-23A switching power at 415 V AC.
- 37 kW AC-23A switching power at 690 V AC.
- Four-pole (4P) main switching configuration.
- 80 A AC-23A operational current at 415 V AC.
- 40 A AC-23A operational current at 690 V AC.
- Manual I-O / ON-OFF operation.
- Red/yellow selector-type operating handle.
- OFF-position padlocking for up to three padlocks.
- Interlocked enclosure cover with defeatable interlock function.
- IP65 enclosure protection rating.
- UV-protected glass-fibre-reinforced polycarbonate enclosure.
- One normally open (1NO) auxiliary contact fitted.
- Maximum auxiliary contact configuration of 2NO + 2NC using compatible accessories.
- Two M50 and one M16 threaded cable entry knockouts at both the top and bottom.
- Neutral and protective earth terminals included.
- Surface-mounted, front-operated construction.
- 400 × 200 × 140 mm enclosure dimensions.
- Approximately 2.5 kg net weight.
Technical Specifications
- Manufacturer: ABB
- Series: OTP Plastic Enclosed Safety Switches
- Model: OTP75A4M
- ABB order code: OTP75A4M
- ABB product ID: 1SCA022812R3780
- ABB product group: 311004-Plastic Enclosed Switches (Otp)
- Product type: Plastic enclosed safety switch-disconnector
- Rated motor switching power AC-23A at 415 V AC: 37 kW
- Rated motor switching power AC-23A at 690 V AC: 37 kW
- Rated motor switching power AC-23A at 230 V AC: 22 kW
- Number of poles: 4
- Switching positions: I-O / ON-OFF
- Operating mechanism: Manual rotary selector
- Rated operational current AC-23A at 415 V AC: 80 A
- Rated operational current AC-23A at 690 V AC: 40 A
- Rated operational voltage: Up to 750 V AC
- Rated uninterrupted current (Iu): 115 A
- Rated short-time withstand current (Icw): 2.5 kA
- 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 OFF position
- Cover interlock: Yes
- Defeatable cover interlock: Yes, for authorised procedures
- Enclosure material: Glass-fibre-reinforced polycarbonate
- Enclosure UV protection: Yes
- Enclosure protection rating: IP65
- Enclosure colour: Grey
- Mounting type: Surface mounting
- Operating direction: Front operation
- Cable entry type: Metric threaded knockouts
- Cable entry configuration: 2 × M50 + M16 per side
- Cable entry positions: Top and bottom
- Compression cable glands: Ordered separately
- Main circuit terminal type: Screw clamp
- 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: Approximately 2.5 kg
- EAN / GTIN: 6417019274522
- Applicable product standard: IEC 60947-3
Reliable Four-Pole Machinery Isolation with Red/Yellow Safety Handle
The ABB OTP75A4M is designed to provide a clearly identifiable local electrical isolation point for industrial machinery and motor-driven equipment. Its four-pole switch-disconnector mechanism allows four conductors to be opened together, supporting three-phase installations where a switched neutral is required. Protective earth continuity must be maintained in accordance with the installation design.
The red/yellow selector handle provides clear visual identification of the switch operating position. It can be secured in the OFF position using up to three padlocks, helping prevent unintended re-energisation during maintenance. The enclosure cover is mechanically interlocked with the switch mechanism and incorporates a defeatable interlock facility for authorised inspection procedures carried out in accordance with ABB instructions.
The integrated 1NO auxiliary contact can be connected to an appropriately designed control circuit for switch-position indication or interlocking. This is particularly useful where a machinery controller needs to monitor the state of a local isolator. Additional compatible auxiliary contacts can be installed where required, subject to the maximum supported contact configuration.
The IP65 glass-fibre-reinforced polycarbonate enclosure offers resistance to dust ingress and water jets, while its UV-protected construction supports use in suitable indoor and outdoor environments. Correct selection and installation of cable glands, along with appropriate sealing of unused openings, are essential to preserving the enclosure protection rating.
The OTP75A4M is supplied with metric threaded cable entry knockouts for two M50 power cable entries and one M16 control cable entry at both the top and bottom. This arrangement provides flexibility when routing power and auxiliary control wiring. As a switch-disconnector, the OTP75A4M must be used with appropriately selected upstream short-circuit and overload protection.
Typical Applications
- Local isolation of three-phase industrial motors.
- 37 kW motor switching applications at 415 V AC.
- Four-pole machinery isolation installations.
- Industrial conveyor and material handling systems.
- Manufacturing and production equipment.
- 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 electrical control systems.
- Indoor and suitably installed outdoor machinery isolation points.
