Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
OTM250E3CM230C ABB 250A 3-Pole Motorised Change-Over Switch 230V AC I-0-II
ABB OTM250E3CM230C 250 A three-pole motorised change-over switch with 220–240 V AC motor operation, I-0-II open-transition switching, remote electrical control and manual operating capability for industrial power distribution and mains-to-generator changeover systems.
£2,125.67
Why Choose the ABB OTM250E3CM230C 250A Motorised Change-Over Switch?
The ABB OTM250E3CM230C is a robust and reliable 250 A three-pole motorised change-over switch designed for remote-controlled switching between two electrical power supplies in industrial, commercial and low-voltage distribution systems. As part of the ABB OTM motorised change-over switch series, it provides efficient power source selection for mains-to-generator changeover, alternative feeder switching and industrial electrical distribution applications.
This motorised change-over switch features a three-position I-0-II operating mechanism, allowing the connected load to be supplied from either of two sources or disconnected in the central OFF position. Its open-transition, break-before-make switching arrangement disconnects the active source before connecting the alternative supply, preventing intentional paralleling of the two sources during normal changeover operation.
With a rated operational current of 250 A, a three-pole configuration and a 220–240 V AC motor operating supply, the OTM250E3CM230C is suitable for remotely operated power distribution systems. Its integrated motor operator, robust base-mounted construction and provision for manual operation make it a practical solution for industrial switchboards, generator changeover installations and electrical control cabinets.
Key Advantages
- Reliable 250 A motorised change-over switch for industrial and commercial power distribution.
- Three-pole switching configuration for simultaneous switching of three electrical conductors.
- 220–240 V AC motor operating voltage for electrically controlled source changeover.
- Three-position I-0-II operation provides two supply selections and a central OFF position.
- Open-transition switching prevents simultaneous connection of independent power supplies during normal operation.
- Remote electrical operation enables integration with external control systems.
- Manual operating capability provides an alternative means of switching when required.
- 250 A AC-21A and AC-22A ratings at supply voltages up to 415 V AC.
- 250 A AC-31B and AC-33B ratings at 415 V AC.
- Base-mounted construction supports installation inside industrial switchboards.
- Integrated motor operator eliminates the need for a separate motorised switching actuator.
- Suitable for mains-to-generator changeover and alternative power supply selection.
Key Features
- ABB OTM motorised change-over switch series.
- 250 A rated operational current.
- Three-pole (3P) configuration.
- I-0-II switching positions.
- Motorised electrical operation with manual operating capability.
- 220–240 V AC motor operating supply.
- Open-transition, break-before-make switching mechanism.
- Rated insulation voltage of 1000 V.
- Rated impulse withstand voltage of 12 kV.
- Rated short-time withstand current of 8 kA for 1 s.
- 170 kVA rated switching power at 400 V under the specified AC-21A/AC-22A conditions.
- 250 A AC-31B and AC-33B operational current at 415 V AC.
- Standard phase-distance construction.
- Front-operated, base-mounted design for electrical switchboards.
- IP20 front protection rating for the switch assembly.
- Direct-mounted black manual operating handle.
- Control circuit connectors and terminal connection hardware supplied with the switch.
- Suitable for integration with appropriately designed automatic transfer control systems.
Technical Specifications
- Manufacturer: ABB
- Series: OTM Motorised Change-Over Switches
- Model: OTM250E3CM230C
- ABB order code: OTM250E3CM230C
- ABB catalogue product ID: 1SCA022845R9260
- ABB product group: OT Change over Switches
- Product type: Motorised change-over switch
- Rated operational current: 250 A
- Number of poles: 3
- Switching positions: I-0-II
- Transition type: Open transition
- Switching principle: Break-before-make
- Operating mechanism: Motorised with manual operation capability
- Motor operating voltage: 220–240 V AC
- Motor voltage type: AC
- Rated operational voltage (Ue): Up to 1000 V AC
- Rated insulation voltage (Ui): 1000 V
- Rated impulse withstand voltage (Uimp): 12 kV
- Conventional free-air thermal current (Ith): 250 A at 40 °C
- Conventional enclosed thermal current (Ithe): 250 A
- Rated operational current AC-21A at 380–415 V AC: 250 A
- Rated operational current AC-22A at 380–415 V AC: 250 A
- Rated operational current AC-31B at 415 V AC: 250 A
- Rated operational current AC-33B at 415 V AC: 250 A
- Rated switching power at 400 V: 170 kVA
- Rated short-time withstand current (Icw): 8 kA for 1 s
- Power loss per pole: 6.5 W at rated operating conditions
- Switch front protection rating: IP20
- Phase spacing: Standard
- Mounting type: Base mounting
- Operating direction: Front operation
- Manual handle type: Direct-mounted handle
- Handle colour: Black
- Line terminal arrangement: Top incoming / bottom outgoing or bottom incoming / top outgoing
- Pollution degree: 3
- Included accessories: Manual operating handle, terminal bolt kit, control circuit connectors, handle storage clamp and spare fuses
- Product net depth: 197 mm
- Net weight: approx. 5.6 kg
- Package dimensions (H × W × D): 215 × 215 × 395 mm
- Package gross weight: approx. 6.9 kg
- EAN: 6417019296616
- Country of origin: Finland
Reliable Motorised Power Source Changeover
Motorised change-over switches such as the ABB OTM250E3CM230C enable electrical loads to be transferred between two independent power supplies using an electrically operated switching mechanism. The integrated motor operator allows switching commands to be issued from a suitable external control circuit, reducing the need for an operator to physically operate the switch during normal source changeover.
The I-0-II switching arrangement provides three defined positions. Position I connects the load to the first power source, position 0 disconnects the load from both sources, and position II connects the load to the alternative source. The open-transition mechanism ensures that the first supply is disconnected before the second supply is connected.
The 220–240 V AC motor operator allows the switch to be integrated into remote-controlled electrical distribution systems. When combined with a suitable automatic transfer controller, voltage monitoring equipment and correctly designed control circuitry, the OTM250E3CM230C can form part of an automatic mains-to-generator transfer installation. The motorised switch itself should not be confused with a complete automatic transfer switch assembly incorporating independent supply monitoring and generator management.
The three-pole configuration provides simultaneous switching of three conductors, making the device suitable for three-phase distribution systems where the neutral arrangement is managed separately in accordance with the installation design. Its base-mounted construction, standard phase spacing and included manual operating handle support installation, operation and maintenance within industrial switchboards.
Typical Applications
- Motorised mains-to-generator changeover installations.
- Remote-controlled power source selection systems.
- Industrial and commercial electrical distribution boards.
- Automatic transfer systems incorporating external controllers.
- Alternative feeder switching and dual-supply installations.
- Manufacturing plants and industrial production facilities.
- Commercial building electrical infrastructure.
- Standby generator and backup power distribution systems.
- Industrial switchgear and electrical control cabinets.
- Water treatment and pumping station power distribution.
- Building services and facility management electrical systems.
- OEM switchboard manufacturing and electrical panel building.
Technical Specifications
Tick the specs you need, then view products that match.
| Device Type | Motorised changeover switch | |
|---|---|---|
| Operation | Motorised | |
| Mounting Type | Base mounting |
Frequently Asked Questions
What is the ABB OTM250E3CM230C used for?
The ABB OTM250E3CM230C is a 250 A three-pole motorised change-over switch used to transfer electrical loads between two separate power supplies. Typical applications include mains-to-generator changeover, alternative feeder selection and remotely controlled industrial power distribution.
What is the rated current of the ABB OTM250E3CM230C?
The switch has a 250 A rated operational current, including 250 A AC-21A and AC-22A ratings at 380–415 V AC. It also supports 250 A AC-31B and AC-33B operation at 415 V AC.
How many poles does the ABB OTM250E3CM230C have?
The OTM250E3CM230C features a three-pole (3P) configuration. It switches three electrical conductors simultaneously and is suitable for appropriately designed three-phase electrical distribution systems.
What voltage is required to operate the motorised mechanism?
The integrated motor operator requires a 220–240 V AC supply. This is the motor control supply voltage and is separate from the rated operational voltage of the main power switching contacts.
What does I-0-II mean on the ABB OTM250E3CM230C?
The I-0-II designation identifies the three switching positions. Position I connects the load to the first supply, position 0 disconnects the load from both supplies, and position II connects the load to the second supply.
Can the ABB OTM250E3CM230C be used for automatic generator changeover?
Yes. The OTM250E3CM230C can be integrated into an automatic generator changeover system when combined with a suitable external transfer controller, supply monitoring equipment and correctly designed control circuitry. The switch provides the motorised changeover function but does not independently provide a complete automatic transfer control system.
Can the ABB OTM250E3CM230C be operated manually?
Yes. The switch includes a manual operating handle that provides an alternative means of operating the change-over mechanism when required. Manual operation must be carried out in accordance with the manufacturer's operating instructions and safety procedures.
What is the rated insulation voltage of the ABB OTM250E3CM230C?
The switch has a rated insulation voltage of 1000 V and a rated impulse withstand voltage of 12 kV. The applicable operational current must be selected according to the supply voltage, utilisation category and connected load.
What is the short-time withstand current of the ABB OTM250E3CM230C?
The OTM250E3CM230C has a rated short-time withstand current of 8 kA for 1 s. Suitable upstream short-circuit protective devices must be selected according to the electrical installation requirements.
Where is the ABB OTM250E3CM230C typically installed?
The switch is typically base-mounted inside an industrial electrical switchboard, distribution cabinet or control panel. Its integrated motor operator enables remote electrical switching, while the included manual handle supports local operation when required.
Trusted by Electrical Engineers and Industrial Automation Professionals Worldwide
ABB OTM motorised change-over switches provide dependable electrical power source selection for industrial and commercial distribution systems. The OTM250E3CM230C combines a robust 250 A three-pole switching mechanism, 220–240 V AC motor operation, open-transition I-0-II switching and manual operating capability to support reliable remote-controlled power transfer in modern electrical installations.
