Why Choose the ABB OTP75T3M 37kW 3-Pole IP65 Plastic Enclosed Switch Disconnector?
The ABB OTP75T3M, manufacturer order code 1SCA022812R2890, is a heavy-duty three-pole plastic enclosed safety switch disconnector designed for reliable manual switching and electrical isolation in industrial and commercial installations. Part of the established ABB OTP enclosed switch range, it combines a robust switching mechanism, protective IP65 enclosure and externally operated handle in a complete assembly suitable for mounting near machinery and electrical equipment.
With a 37 kW AC-23A motor switching rating at 380–415 V AC and a corresponding 80 A operational current rating, the OTP75T3M is designed for demanding industrial motor applications. It also offers an AC-22A operational current rating of 100 A at 380–415 V AC, making it suitable for appropriately rated mixed resistive and inductive loads. Its three-pole configuration allows simultaneous disconnection of three phase conductors through a single operating mechanism.
A key feature of the OTP75T3M is its metric threaded cable-entry knockout arrangement, providing two M50 openings and one M16 opening at both the top and bottom of the enclosure. The switch is supplied with a black selector handle, an interlocked cover, a fixed neutral terminal, protective earth terminals and one normally open auxiliary contact. Its rigid glass-fibre-reinforced polycarbonate enclosure measures 400 × 200 × 140 mm and provides IP65 protection when correctly installed.
Key Advantages
- Three-pole switching configuration provides simultaneous isolation of three phase conductors.
- 37 kW AC-23A motor switching capability at 380–415 V AC.
- 80 A AC-23A operational current rating at 380–415 V AC.
- 100 A AC-22A operational current rating for suitable mixed resistive and inductive loads.
- IP65 enclosure protection against dust ingress and water jets.
- IK08 impact resistance provides additional mechanical protection.
- Black selector operating handle offers clear external ON/OFF control.
- Padlockable OFF position supports controlled maintenance isolation procedures.
- Interlocked enclosure cover helps restrict access during normal operation.
- Metric threaded cable-entry knockouts provide convenient power and control cable routing.
- One normally open auxiliary contact included for supplementary indication or control functions.
- Neutral and protective earth terminals included for associated conductor connections.
- UV-protected polycarbonate construction supports use in suitably assessed indoor and outdoor environments.
- Surface-mounted enclosed design provides a practical local machinery isolation solution.
Key Features
- Manufacturer: ABB.
- Model: OTP75T3M.
- Manufacturer order code: 1SCA022812R2890.
- Product series: OTP Plastic Enclosed Safety Switches.
- Product type: Enclosed switch disconnector.
- Number of switched poles: 3.
- AC-23A operational current at 380–415 V: 80 A.
- AC-22A operational current at 380–415 V: 100 A.
- AC-23A motor switching power at 380–415 V: 37 kW.
- AC-23A motor switching power at 690 V: 37 kW.
- Conventional enclosed thermal current: 115 A.
- Rated insulation voltage: 750 V.
- Enclosure ingress protection: IP65.
- Enclosure impact resistance: IK08.
- Enclosure material: Glass-fibre-reinforced polycarbonate.
- Enclosure colour: Grey.
- Operating handle: Black selector handle.
- Operating indication: I–0 / ON–OFF.
- Cover interlocking: Included, with defeatable interlocking.
- Cable-entry configuration: Metric threaded knockouts.
- Cable-entry arrangement: 2 × M50 + M16 at the top and bottom.
- Auxiliary contacts supplied: 1 NO.
- Maximum auxiliary contact configuration: 2 NO + 2 NC.
- Neutral terminal: Fixed neutral terminal included.
- Protective earth terminals: Included.
- Mounting: Surface mounting.
Technical Specifications
- Manufacturer: ABB
- Model: OTP75T3M
- Manufacturer order code: 1SCA022812R2890
- ABB product group: 311004 – Plastic Enclosed Switches (OTP)
- Product description: 3-pole, 37 kW, IP65 plastic enclosed switch with metric cable-entry knockouts
- Product category: Enclosed safety switches and switch disconnectors
- Product series: ABB OTP
- Number of switched poles: 3
- Rated operational current (AC-22A, 380–415 V): 100 A
- Rated operational current (AC-22A, 500 V): 100 A
- Rated operational current (AC-22A, 690 V): 100 A
- Rated operational current (AC-23A, 380–415 V): 80 A
- Rated operational current (AC-23A, 500 V): 60 A
- Rated operational current (AC-23A, 690 V): 40 A
- Rated operational motor power (AC-23A, 230 V): 22 kW
- Rated operational motor power (AC-23A, 380–415 V): 37 kW
- Rated operational motor power (AC-23A, 500 V): 37 kW
- Rated operational motor power (AC-23A, 690 V): 37 kW
- Conventional enclosed thermal current: 115 A
- Rated insulation voltage: 750 V
- Rated operational voltage, main circuit: 750 V
- Rated short-time withstand current (1 s): 2.5 kA
- Rated short-circuit making capacity at 690 V AC: 3.6 kA
- Power loss at rated operating conditions: 4 W per pole
- Pollution degree: 3
- Enclosure protection rating: IP65
- Enclosure impact resistance: IK08
- Enclosure material: Glass-fibre-reinforced polycarbonate
- Enclosure colour: Grey
- Operating handle type: Selector handle
- Handle colour: Black
- Handle indication: I–0 / ON–OFF
- Cover interlocking: Included
- Interlock override: Defeatable by authorised personnel
- Operating arrangement: Front operated
- Mounting arrangement: Surface mounting
- Cable-entry positions: Top and bottom
- Cable-entry type: Metric threaded knockouts
- Cable-entry arrangement per side: 2 × M50 + M16
- Compression cable glands: Ordered separately
- Main circuit terminal type: Screw clamp
- Main circuit conductor capacity: 10–70 mm²
- Main circuit wire stripping length: 20 mm
- Main circuit tightening torque: 6 N·m
- Recommended terminal tool: Hexagon 4
- Auxiliary contacts included: 1 NO + 0 NC
- Maximum auxiliary contacts: 2 NO + 2 NC
- Neutral terminal: Fixed neutral terminal included
- Protective earth terminals: Included
- Enclosure height: 400 mm
- Enclosure width: 200 mm
- Enclosure depth: 140 mm
- Approximate catalogue unit weight: 2.4 kg
- Applicable standards: IEC 60947-1 and IEC 60947-3
37kW Motor Isolation with IP65 Protection and Metric Cable Entries
The ABB OTP75T3M provides a convenient means of manually disconnecting three-phase industrial equipment from its electrical supply. Its three-pole switching mechanism operates the three phase conductors together, while the externally mounted selector handle allows the switching mechanism to be operated without opening the enclosure. This makes the device suitable for machinery isolation points where straightforward operation and clear switch-position indication are important.
The OTP75T3M is rated for 37 kW motor switching at 380–415 V AC under AC-23A conditions, with an associated operational current of 80 A. Its AC-23A current rating reduces to 60 A at 500 V AC and 40 A at 690 V AC, although the published motor power rating remains 37 kW at those voltages. Under AC-22A conditions, the switch provides a 100 A operational current rating across the specified voltage range. These ratings demonstrate why the utilisation category, supply voltage and connected load must all be considered during equipment selection.
The IP65 enclosure is constructed from rigid, glass-fibre-reinforced polycarbonate and provides protection against dust ingress and water jets when correctly installed. Its IK08 impact resistance offers additional durability in industrial environments. The enclosure is UV protected, making it suitable for appropriately assessed indoor and outdoor installations. Correct cable gland selection, mounting and sealing remain essential for maintaining the specified environmental protection.
The OTP75T3M incorporates two M50 threaded cable-entry knockouts and one M16 knockout at both the top and bottom of the enclosure. This arrangement supports routing of main power cables and associated auxiliary wiring. Suitable compression cable glands must be selected separately. The switch is supplied with a fixed neutral terminal, protective earth terminals and one normally open auxiliary contact, which can be incorporated into a suitable indication or control circuit.
The black selector handle provides clear ON/OFF indication, while the interlocked cover helps restrict access to the switching assembly during normal operation. A defeatable interlock allows authorised access where permitted by the manufacturer's instructions and applicable safe working procedures. As a switch disconnector rather than an automatic overcurrent protective device, the OTP75T3M must be used with appropriately selected fuses, circuit breakers or other protective devices as required by the installation.
Typical Applications
- Three-phase industrial motor isolation.
- 37 kW motor circuits at 380–415 V AC under AC-23A conditions.
- Industrial machinery and production equipment.
- Manufacturing plants and automated production lines.
- Conveyor systems and material handling machinery.
- Industrial pumps, fans and compressors.
- HVAC plant and mechanical services equipment.
- Packaging machinery and processing equipment.
- Industrial electrical distribution and control installations.
- OEM machinery and equipment manufacturing.
- Maintenance isolation points requiring an IP65 enclosed switch.
- Installations requiring M50 and M16 metric cable-entry knockouts.
