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.
