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OTM250E4CM24D ABB 250A 4-Pole Motorised Changeover Switch 24V DC
ABB OTM250E4CM24D is a 250 A four-pole open-transition motorised changeover switch with a 24 V DC motor operator for industrial and commercial electrical power source transfer applications.
£2,165.39
Why Choose the ABB OTM250E4CM24D Motorised Changeover Switch?
The ABB OTM250E4CM24D is a robust 250 A four-pole motorised changeover switch designed for controlled transfer between two electrical power sources. As part of the ABB OT motorised changeover switch range, it combines dependable power switching with an integrated motor operator for remote source selection in industrial and commercial electrical distribution systems.
The OTM250E4CM24D provides open-transition changeover operation, disconnecting one supply before connecting the alternative source. Its four-pole configuration allows simultaneous switching of four conductors, while the integrated motor operator enables electrical operation from a control system and the supplied manual handle provides local operating capability when required.
With a rated current of 250 A, four-pole configuration and 24 V DC motor operating voltage, the OTM250E4CM24D is well suited to mains/generator transfer, standby power systems and alternative supply selection. It provides a rated operational power of 140 kW at 400 V AC under AC-23A and is designed for base mounting within electrical switchboards and distribution assemblies.
Key Advantages
- Reliable 250 A motorised changeover switching for power distribution applications.
- Four-pole configuration for applications requiring four switched conductors.
- 24 V DC motor operator suitable for low-voltage control systems.
- Open-transition operation disconnects one source before connecting the alternative supply.
- Integrated motor drive enables remote electrical source selection.
- Manual operating handle provides local operation when required.
- Base-mounted construction simplifies integration into switchboards and electrical distribution assemblies.
Key Features
- ABB OT motorised changeover switch range.
- 250 A rated operational current.
- 4-pole switching configuration.
- 24 V DC motor operating voltage.
- Open-transition changeover operation.
- 140 kW AC-23A rated operational power at 380–415 V.
- 1000 V rated insulation voltage (Ui).
- 12 kV rated impulse withstand voltage (Uimp).
- 8 kA RMS short-time withstand current for 1 s.
- IP20 front protection.
- Direct-mounted black manual operating handle.
- Fourth pole positioned on the right with simultaneous switching function.
Reliable Motorised Power Source Changeover
Motorised changeover switches such as the ABB OTM250E4CM24D provide a controlled method of transferring an electrical load between two independent power sources. The open-transition mechanism disconnects the active source before connecting the alternative supply, helping maintain defined separation between the two sources during the transfer sequence.
The integrated 24 V DC motor operator allows the switch to be controlled remotely as part of a power management or transfer control system. ABB also provides manual operating capability, making the OTM250E4CM24D suitable for installations requiring both automated source selection and local intervention during commissioning, maintenance or control-system outages.
Typical Applications
- Mains and generator power source changeover systems.
- Standby and emergency power distribution.
- Industrial electrical switchboards.
- Commercial building power distribution systems.
- Alternative supply selection and transfer systems.
- Four-pole power transfer applications requiring motorised operation.
Technical Specifications
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| Mounting Type | Base mounting | |
|---|---|---|
| Device Type | Motorised changeover switch | |
| Operation | Motorised | |
| Series | OT Motorised Changeover Switches | |
| ABB product ID | 1SCA022846R1670 | |
| Product type | Motorised changeover switch | |
| Rated current | 250 A | |
| Number of poles | 4 | |
| Motor operating voltage | 24 V DC | |
| Transition type | Open transition | |
| Rated operational current AC-21A | 250 A at 380–415 V / 500 V / 690 V | |
| Rated operational current AC-22A | 250 A at 380–415 V / 500 V / 690 V | |
| Rated operational current AC-23A | 250 A at 380–415 V / 500 V / 690 V | |
| Rated operational power AC-23A | 140 kW at 380–415 V | |
| Rated operational power AC-23A at 500 V | 170 kW | |
| Rated operational power AC-23A at 690 V | 250 kW | |
| Rated operational voltage | 1000 V | |
| Rated insulation voltage (Ui) | 1000 V | |
| Rated impulse withstand voltage (Uimp) | 12 kV | |
| Rated short-time withstand current (Icw) | 8 kA RMS for 1 s | |
| Protection rating | IP20 front | |
| Mounting type | Base mounting | |
| Operating mode | Front operation | |
| Terminal type | Screw terminals | |
| Fourth pole position | Right side | |
| Fourth pole function | Switched, simultaneous | |
| Dimensions (H × W × D) | 150 × 307 × 197 mm |
Frequently Asked Questions
What is the ABB OTM250E4CM24D used for?
The ABB OTM250E4CM24D is used for motorised transfer between two electrical power sources in industrial, commercial and standby power distribution systems.
What is the rated current of the OTM250E4CM24D?
The OTM250E4CM24D has a rated operational current of 250 A.
How many poles does the ABB OTM250E4CM24D have?
This model has a four-pole configuration, with the fourth pole located on the right and providing simultaneous switching.
What motor operating voltage does the OTM250E4CM24D use?
The integrated motor operator is designed for a 24 V DC control supply.
Is the OTM250E4CM24D an open-transition changeover switch?
Yes. The OTM250E4CM24D uses open-transition switching, so the connected source is disconnected before the alternative source is connected.
What is the AC-23A power rating of the OTM250E4CM24D?
The switch has an AC-23A rated operational power of 140 kW at 380–415 V, with ratings of 170 kW at 500 V and 250 kW at 690 V.
Trusted by Electrical Distribution Professionals Worldwide
ABB OT motorised changeover switches are designed for dependable power source transfer, combining robust switching performance, integrated motor operation and manual control capability for industrial and commercial electrical distribution systems.
