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OTM1250E3CM230C ABB 1250A 3-Pole Motorised Changeover Switch 230V AC
ABB OTM1250E3CM230C 1250 A three-pole motorised changeover switch with an integrated 220–240 V AC motor operator, open-transition I–0–II switching, 1000 V rated insulation voltage and manual operating provision for industrial power source transfer applications.
£5,607.47
Why Choose the ABB OTM1250E3CM230C 1250A Motorised Changeover Switch?
The ABB OTM1250E3CM230C is a heavy-duty 1250 A three-pole motorised changeover switch designed for reliable electrical power source transfer in industrial and commercial low-voltage distribution systems. Part of the ABB OTM motorised changeover switch range, it combines high-current switching capability with an integrated motor operator, enabling electrically controlled transfer between two alternative power supplies.
Featuring a 220–240 V AC motor operating supply, the OTM1250E3CM230C provides a practical solution for applications requiring remote or electrically initiated changeover operations. Its I–0–II switching arrangement allows selection between Source I, an isolated centre-off position and Source II. The open-transition mechanism disconnects one supply before connecting the other, helping prevent unintended parallel operation of independent electrical sources.
With a rated operational current of 1250 A for AC-21A and AC-22A applications at voltages up to 690 V AC, the OTM1250E3CM230C is suitable for substantial electrical distribution loads. Its integrated motor operator, manual operating handle and robust switch-disconnector construction make it suitable for generator changeover systems, industrial switchboards, commercial buildings and electrical installations requiring dependable power source management.
Key Advantages
- 1250 A rated operational current for high-capacity industrial and commercial power distribution.
- Three-pole configuration suitable for switching three-phase electrical supplies.
- Integrated motor operator enables electrically controlled and remote changeover operation.
- 220–240 V AC motor supply suitable for compatible industrial control systems.
- I–0–II switching positions provide selection between two supplies and a centre-off position.
- Open-transition operation disconnects one source before connecting the alternative source.
- 1250 A AC-21A and AC-22A ratings at 380–415 V, 500 V and 690 V AC.
- 50 kA short-time withstand current for 1 s supports appropriately coordinated electrical distribution installations.
- 1000 V rated insulation voltage for low-voltage switchgear applications.
- Supplied with a manual operating handle for local operation when required.
- Includes terminal fastening hardware and control circuit connectors.
- Compatible with suitable external automatic transfer controllers for ATS applications.
- Robust ABB OT-series construction designed for industrial switchboard integration.
Key Features
- ABB OTM motorised changeover switch series.
- OTM1250E3CM230C motor-operated changeover switch.
- 1250 A rated current.
- Three-pole (3P) switching arrangement.
- 220–240 V AC motor operating voltage.
- I–0–II operating positions.
- Open-transition, break-before-make switching principle.
- Integrated electrical motor drive.
- Manual operation using the supplied handle.
- Base-mounted construction for switchboard installation.
- 1000 V rated operational and insulation voltage.
- 12 kV rated impulse withstand voltage.
- 50 kA / 1 s short-time withstand current.
- 1250 A AC-23A operational rating at 380–415 V AC.
- 1000 A AC-33B operational rating at 415 V AC.
- Supplied with manual operating handle, terminal bolt kit and control circuit connectors.
- Suitable for integration with compatible power source monitoring and transfer control equipment.
Technical Specifications
- Manufacturer: ABB
- Series: OTM Motorised Changeover Switches
- Product family: OT Changeover Switches
- Model: OTM1250E3CM230C
- ABB order code: OTM1250E3CM230C
- ABB catalogue product ID: 1SCA112676R1001
- Product type: Motorised changeover switch
- Product group: OT Change over Switches
- Rated operational current: 1250 A
- Number of poles: 3
- Pole configuration: 3P
- Motor operating voltage: 220–240 V AC
- Nominal motor supply: 230 V AC
- Motor operator: Integrated
- Operating positions: I–0–II
- Changeover type: Open transition
- Operating method: Electrical motor operation with manual operating provision
- Rated operational voltage: Up to 1000 V AC
- Rated insulation voltage (Ui): 1000 V
- Rated impulse withstand voltage (Uimp): 12 kV
- Rated operational current AC-21A: 1250 A at 380–415 V, 500 V and 690 V AC
- Rated operational current AC-22A: 1250 A at 380–415 V, 500 V and 690 V AC
- Rated operational current AC-23A: 1250 A at 380–415 V, 500 V and 690 V AC
- Rated operational current AC-31B: 1250 A at 415 V AC
- Rated operational current AC-33B: 1000 A at 415 V AC
- Rated operational power at 400 V: 710 kW (AC-23A)
- Rated operational power at 500 V: 900 kW (AC-23A)
- Rated operational power at 690 V: 1200 kW (AC-23A)
- Rated short-time withstand current (Icw): 50 kA rms for 1 s
- Conventional free-air thermal current: 1250 A at 40 °C
- Power loss: 29 W per pole at rated operating conditions
- Mounting type: Base mounting
- Operating mechanism location: End of switch
- Product dimensions (W × H × D): 507 × 306 × 297 mm
- Net weight: Approximately 55 kg
- Supplied accessories: Manual operating handle, terminal bolt kit, control circuit connectors, handle storage clip and spare fuses
- Country of origin: Finland
- EAN / GTIN: 6417019453910
- Applicable product standard: IEC/EN 60947-3
Reliable Motorised Power Source Transfer for High-Current Installations
The ABB OTM1250E3CM230C provides an electrically operated solution for transferring electrical loads between two alternative supplies. In a typical mains-to-generator installation, Source I represents the normal electrical supply and Source II represents the standby generator. The integrated motor operator allows the changeover mechanism to be operated through a compatible control circuit rather than requiring every transfer to be performed manually.
Its I–0–II operating sequence provides a defined centre-off position between the two supply selections. The open-transition arrangement ensures that the first source is disconnected before the alternative source is connected, making the switch suitable for systems where independent electrical supplies must remain separated.
The 1250 A three-pole switching arrangement is intended for substantial three-phase electrical loads. ABB specifies operational current ratings according to IEC utilisation categories, including AC-21A, AC-22A, AC-23A, AC-31B and AC-33B. These classifications help engineers select the switch according to the characteristics of the connected load rather than relying solely on its nominal current rating.
The OTM1250E3CM230C incorporates an integrated 230 V AC motor operator, but it is not by itself a complete automatic transfer switch controller. Automatic mains failure detection, generator start commands, transfer timing and supply monitoring require a suitably designed external control system or compatible ABB automatic transfer control equipment.
For maintenance and commissioning, the supplied manual operating handle provides an alternative means of operating the switch in accordance with ABB's operating instructions. Its base-mounted design, supplied terminal fastening hardware and control connectors support integration into purpose-built low-voltage switchboards and electrical distribution assemblies.
Typical Applications
- Industrial mains-to-generator changeover installations.
- Motorised transfer between normal and standby electrical supplies.
- Commercial building electrical distribution systems.
- Industrial low-voltage switchboards and switchgear assemblies.
- Automatic transfer switch systems with suitable external controllers.
- Manufacturing plants and production facilities.
- Data centres and critical infrastructure power distribution.
- Hospital and healthcare facility standby power systems.
- Industrial pumping stations and water treatment facilities.
- Large commercial and institutional electrical installations.
- Utility and infrastructure power distribution systems.
- Remote-controlled power source selection applications.
- OEM electrical switchgear and industrial 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 OTM1250E3CM230C used for?
The ABB OTM1250E3CM230C is a 1250 A three-pole motorised changeover switch used to transfer electrical loads between two alternative power sources in industrial and commercial low-voltage distribution systems.
What is the rated current of the OTM1250E3CM230C?
The switch has a rated operational current of 1250 A for AC-21A, AC-22A and AC-23A applications at 380–415 V AC, subject to the manufacturer's specified operating conditions.
How many poles does the ABB OTM1250E3CM230C have?
The OTM1250E3CM230C has three poles (3P), allowing it to switch the three phase conductors of a suitable three-phase electrical installation.
What motor supply voltage does the OTM1250E3CM230C require?
The integrated motor operator is designed for a 220–240 V AC supply, with a nominal operating voltage of 230 V AC.
Can the OTM1250E3CM230C be used for generator changeover?
Yes. The switch is suitable for mains-to-generator changeover where a 1250 A three-pole motorised transfer device meets the installation's electrical requirements. Generator monitoring and automatic transfer control require suitable additional equipment.
Is the ABB OTM1250E3CM230C a complete automatic transfer switch?
No. The OTM1250E3CM230C includes an integrated motor operator for electrically controlled changeover, but automatic source monitoring and transfer decisions require a compatible external automatic transfer controller or control system.
What do the I–0–II positions mean?
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.
Does the OTM1250E3CM230C use open-transition switching?
Yes. The switch uses an open-transition, break-before-make arrangement, disconnecting one supply before connecting the alternative source.
Can the OTM1250E3CM230C be operated manually?
Yes. ABB supplies a manual operating handle with the motorised changeover switch, allowing manual operation in accordance with the manufacturer's operating and safety instructions.
What is the short-time withstand current of the OTM1250E3CM230C?
The switch has a rated short-time withstand current of 50 kA rms for 1 s. Appropriate upstream protective devices and fault-current coordination are required.
What accessories are supplied with the OTM1250E3CM230C?
ABB specifies a manual operating handle, terminal bolt kit with nuts and washers, control circuit connectors, handle storage clip and spare fuses as standard supplied equipment for this motorised changeover switch.
What is the ABB order code for the OTM1250E3CM230C?
The supplied ABB order code is OTM1250E3CM230C. ABB's manufacturer catalogue also identifies the model under product ID 1SCA112676R1001.
Trusted by Industrial Electrical and Power Distribution Professionals
ABB OTM motorised changeover switches provide dependable electrically operated source transfer solutions for industrial switchboards, standby power systems and commercial electrical installations. With its 1250 A three-pole switching capability, integrated 230 V AC motor operator and open-transition I–0–II mechanism, the OTM1250E3CM230C supports reliable power source management in demanding low-voltage distribution applications.
