ABB OT switch-disconnectors provide manual isolation and switching for low-voltage power systems. The family spans 16–4000 A nominal frame sizes, with 3-, 4-, 6- and 8-pole configurations and AC/DC variants across selected ranges.
The ABB OT Manual Switch-Disconnectors are designed for reliable manual switching and electrical isolation in low-voltage power distribution systems. Covering rated current options from 16 A to 4,000 A, the series offers flexible configurations for industrial machinery, electrical switchboards, motor control centers and power distribution applications. Featuring a modular construction, robust switching mechanisms and a comprehensive range of installation accessories, ABB OT switches support efficient circuit isolation and load switching across different electrical installations.
The OT series is designed to make, carry and interrupt electrical currents under specified operating conditions. Available utilization categories, including AC-20, AC-21, AC-22 and AC-23, support different switching requirements ranging from isolation without load switching to the operation of mixed resistive and inductive loads, including motor loads. Its reliable manual operating mechanism provides clear ON/OFF control and supports safe electrical isolation during inspection and maintenance.
Designed for flexible integration into electrical enclosures and switchboards, the OT series features a compact modular structure with multiple frame sizes and pole configurations. Depending on the selected model, 2-pole, 3-pole and 4-pole arrangements are available. The modular design allows different switching mechanisms, connection arrangements and mounting orientations to accommodate various panel layouts and installation requirements.
The ABB OT series supports a wide range of installation accessories, including direct and external rotary handles, adjustable shafts, auxiliary contacts, terminal shrouds and mounting components. These accessories provide flexibility for front-door operation, remote handle positioning, electrical status indication and customized switchboard assembly. Selected models also support DIN-rail or base mounting, simplifying integration into industrial control panels and distribution enclosures.
ABB OT Manual Switch-Disconnectors are suitable for manual switching and isolation in a wide range of low-voltage electrical applications, including:
Power Distribution: Main and sub-distribution circuit isolation in electrical switchboards.
Industrial Machinery: Manual disconnection of motors and industrial equipment.
Motor Control Centers: Switching and isolation arrangements for motor feeder circuits.
HVAC Systems: Electrical isolation for pumps, fans and ventilation equipment.
Renewable Energy: Switching and isolation in compatible electrical and photovoltaic installations.
Industrial Control Panels: Manual circuit isolation and load switching in OEM electrical enclosures.
Power Generation: Switching and isolation arrangements in generator and auxiliary power systems.
Product Range: OT16–OT4000.
Rated Current: 16–4,000 A across the product family, depending on utilization category and model.
Pole Configuration: 2P, 3P and 4P for applicable standard models; selected OT Plus versions also offer 6P and 8P configurations.
Operating Method: Manual operation.
Utilization Categories: AC-20, AC-21, AC-22 and AC-23, depending on model and electrical ratings.
Mounting Options: DIN-rail and base mounting for selected models; panel and switchboard mounting for larger versions.
Operating Accessories: Direct and external rotary handles, adjustable shafts and locking devices.
Electrical Accessories: Auxiliary con
| Item | Specification |
| Series | OT switch-disconnectors |
| Rated Current Range | 16–4000 A family range; frame-specific ratings apply |
| Rated Insulation Voltage | 750 V for compact OT16 / OT25 frames; 1000 V for listed larger frames |
| Impulse Withstand | 8 kV for OT16 / OT25; 12 kV for listed larger frames |
| Switching Categories | AC-21 / AC-22 / AC-23 ratings depend on frame, current and voltage |
| Pole Options | 3P / 4P / 6P / 8P / 3+N, depending on model |
| Operating Mechanism | Manual handle or OTM motor-operated mechanism |
| Mounting | Panel mounting; door-coupled operation available by configuration |
| Large-Frame Short-Time Withstand | Up to 60 kA at 690 V for the listed OT3200 / OT4000 configuration |
| Standards | IEC 60947-3 and applicable UL / CSA versions by product |
| Model Family | Rated Current | Poles / Configuration | Switching Rating Reference | Ordering Code Example |
| OT16F3–OT125F3 | 16–125 A | 3P; 4P options by range | AC-22A / AC-23A varies by frame | OT16F3, OT25F3, OT63F3 |
| OT160–OT400 | 160–400 A | 3P / 4P; direct or door handle | Up to AC-23A at 400 V by model | OT160EV03P, OT250E03P, OT400E03P |
| OT630–OT1250 | 630–1250 A | 3P / 4P; accessory options | AC-23A at 400 V by model | OT630E03P, OT800E03P, OT1250E03P |
| OT1600–OT2500 | 1600–2500 A | 3P / 4P; N3 neutral option | Frame-specific AC ratings; neutral pole may be lower-rated | OT1600E03P, OT2000E03P |
| OT3200 / OT4000 | 3200 / 3800 A standard | 3P / 4P variants by version | AC-21B / AC-22B up to 415 V; W version reaches 4000 A | OT3200E03, OT4000E03 |
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