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OTM250E3CM24D ABB 250 A 3-Pole 24 V DC Motorised Change-Over Switch
ABB OTM250E3CM24D is a 250 A three-pole motorised open-transition change-over switch with I-O-II operation and an integrated 24 V DC motor operator for remote power source selection.
£2,125.67
Why Choose the ABB OTM250E3CM24D Motorised Change-Over Switch?
The ABB OTM250E3CM24D is a 250 A three-pole motorised change-over switch designed for controlled switching between two electrical power sources. Part of the ABB OT Change-over Switches range, it combines ABB's OT switching platform with an integrated motor operator for industrial, commercial and standby power distribution applications.
The OTM250E3CM24D provides I-O-II open-transition operation, giving a defined OFF position between the two source positions so that one supply is disconnected before the alternative supply is connected. Its integrated 24 V DC motor operator enables remote electrical operation, while a supplied handle allows manual operation when required.
Rated at 250 A with a three-pole configuration, the OTM250E3CM24D has a rated apparent power of 170 kVA at 400 V and AC-31B / AC-33B ratings of 250 A at 415 V. It is supplied with a manual operating handle, terminal bolt hardware and control-circuit connectors for practical switchboard integration.
Key Advantages
- 250 A motorised change-over switching for remote power source selection.
- Three-pole configuration for simultaneous switching of three conductors.
- Integrated 24 V DC motor operator for low-voltage control systems.
- I-O-II open-transition operation provides a defined OFF position between sources.
- Supports both motorised and manual operation.
- 250 A AC-21A / AC-22A rating at up to 415 V.
- 250 A AC-31B / AC-33B rating at 415 V.
- 170 kVA rated apparent power at 400 V.
Key Features
- ABB OT Change-over Switches product group.
- 250 A rated operational current.
- 3-pole configuration.
- Integrated 24 V DC motor drive.
- I-O-II operating positions.
- Open-transition source switching.
- 250 A AC-21A / AC-22A rating at up to 415 V.
- 170 kVA rated apparent power at 400 V.
- 250 A AC-31B rating at 415 V.
- 250 A AC-33B rating at 415 V.
- Manual operating handle included.
- Terminal bolt kit with nuts and washers included.
- Male connectors for control circuits included.
Reliable 24 V DC Motorised Power Source Change-Over
Motorised change-over switches such as the ABB OTM250E3CM24D enable electrical power sources to be selected remotely without requiring routine manual switching at the electrical panel. The integrated 24 V DC motor operator actuates the switch while its I-O-II open-transition arrangement provides a defined OFF position between the two source positions.
The OTM250E3CM24D combines a 250 A rating with three-pole switching and low-voltage 24 V DC motor control. ABB supplies the switch with a handle for manual operation, a bolt kit with nuts and washers for the terminals, male control-circuit connectors, a handle storage clip and spare fuses, providing the principal operating and installation hardware for switchboard integration.
Typical Applications
- Motorised mains-to-generator change-over systems.
- Standby and alternative power supply switching.
- Industrial electrical distribution systems.
- Commercial building power distribution.
- Switchboards and electrical distribution panels.
- Remote 24 V DC controlled source-selection systems.
Technical Specifications
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| Operation | Motorised | |
|---|---|---|
| Device Type | Motorised changeover switch | |
| Product group | OT Change-over Switches | |
| Product ID / SKU | 1SCA022845R8370 | |
| Product type | Motorised change-over switch | |
| Rated operational current | 250 A | |
| Number of poles | 3 | |
| Motor operational voltage | 24 V DC | |
| Motor drive | Integrated | |
| Operation | I-O-II | |
| Transition type | Open transition | |
| AC-21A / AC-22A rated current at up to 415 V | 250 A | |
| Rated apparent power at 400 V | 170 kVA | |
| AC-31B rated current at 415 V | 250 A | |
| AC-33B rated current at 415 V | 250 A | |
| Manual operation | Handle included | |
| Standard handle | OTV250ECMK | |
| Standard terminal bolt kit | M8 × 25 | |
| Terminal hardware | Nuts and washers included | |
| Control-circuit connections | Male connectors included | |
| Handle storage | Storage clip included | |
| Spare fuses | Included | |
| Unit weight | approx. 6.6 kg |
Frequently Asked Questions
What is the ABB OTM250E3CM24D used for?
The ABB OTM250E3CM24D is a motorised change-over switch designed for controlled switching between two electrical power sources in industrial, commercial and standby power distribution systems.
What is the current rating of the ABB OTM250E3CM24D?
The OTM250E3CM24D has a rated operational current of 250 A and an AC-21A / AC-22A rating of 250 A at up to 415 V.
What voltage is required for the OTM250E3CM24D motor operator?
The integrated motor operator is designed for a 24 V DC operating supply.
How many poles does the ABB OTM250E3CM24D have?
The OTM250E3CM24D is a three-pole motorised change-over switch, allowing three conductors to be switched as part of the change-over operation.
Is the ABB OTM250E3CM24D an open-transition switch?
Yes. The OTM250E3CM24D provides I-O-II open-transition operation, with a defined OFF position between the two electrical source positions.
Trusted ABB Motorised Switching Technology
ABB OTM motorised change-over switches combine established OT switching technology with integrated motor operation, providing remote source selection for industrial, commercial and standby power distribution systems.
