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OTM125F4CMA24D ABB 125 A 4-Pole 24 V DC Motorised Change-Over Switch 45 kW
ABB OTM125F4CMA24D is a 125 A four-pole motorised open-transition change-over switch with a 24 V DC motor operator and 45 kW AC-23A operational power rating for remote power source selection.
£1,074.02
Why Choose the ABB OTM125F4CMA24D Motorised Change-Over Switch?
The ABB OTM125F4CMA24D is a compact and reliable 125 A four-pole motorised change-over switch designed for controlled switching between two electrical power sources in industrial, commercial and standby power distribution systems. As part of the ABB OT Change-over Switches product group, it combines proven change-over switching technology with an integrated motor operator for convenient remote source selection.
The OTM125F4CMA24D provides open-transition I-O-II operation, ensuring that one source is disconnected before the alternative source is connected. Its integrated 24 V DC motor operator enables remote electrical operation, while the supplied direct-mounted handle provides manual operation when required for commissioning, maintenance or emergency intervention.
With a rated operational current of 125 A, a four-pole configuration and an AC-23A operational power rating of 45 kW, the OTM125F4CMA24D is well suited to demanding power transfer applications. Its compact base-mounted construction supports straightforward integration into switchboards, distribution panels and power control equipment.
Key Advantages
- Integrated motorised change-over switching for remote power source selection.
- 125 A four-pole configuration for simultaneous switching of four conductors.
- Integrated 24 V DC motor operator for low-voltage control systems.
- Open-transition I-O-II operation disconnects one source before connecting the alternative source.
- Supports both motorised and manual operation.
- 125 A AC-21A / AC-22A rating at voltages up to 690 V.
- 45 kW AC-23A operational power rating.
- Compact base-mounted construction for efficient switchboard integration.
Key Features
- ABB OT Change-over Switches product group.
- 125 A rated operational current.
- 4-pole configuration.
- Integrated 24 V DC motor drive.
- I-O-II open-transition change-over operation.
- 125 A AC-21A and AC-22A rating at 380–415 V, 500 V and 690 V.
- 90 A AC-23A rating at 380–415 V.
- 45 kW AC-23A operational power at 380–415 V, 500 V and 690 V.
- 800 V rated operational and insulation voltage.
- 8 kV rated impulse withstand voltage.
- 2.5 kA rms short-time withstand current for 1 s.
- Direct-mounted black handle for manual operation.
- Compact front-operated, base-mounted design.
Reliable Motorised Power Source Change-Over
Motorised change-over switches such as the ABB OTM125F4CMA24D enable electrical power sources to be selected remotely without requiring routine manual switching at the electrical panel. The integrated motor mechanism operates the switch while its open-transition design maintains a defined break between the two electrical sources during transfer.
The OTM125F4CMA24D combines 24 V DC motorised operation with a direct-mounted manual handle, providing flexibility for normal operation, commissioning and maintenance. Its four-pole configuration switches the fourth pole simultaneously with the other poles, making it suitable for power distribution arrangements where four conductors must be transferred together.
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 source-selection and power transfer systems.
Technical Specifications
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| Mounting Type | Base mounting | |
|---|---|---|
| Device Type | Motorised changeover switch | |
| Operation | Motorised | |
| Product group | OT Change-over Switches | |
| Product ID / SKU | 1SCA022873R1810 | |
| Product type | Motorised change-over switch | |
| Rated operational current | 125 A | |
| Number of poles | 4 | |
| Motor operational voltage | 24 V DC | |
| Motor drive | Integrated | |
| Operation | I-O-II | |
| Transition type | Open transition | |
| AC-21A rated current at 380–415 V | 125 A | |
| AC-21A rated current at 500 V | 125 A | |
| AC-21A rated current at 690 V | 125 A | |
| AC-22A rated current at 380–415 V | 125 A | |
| AC-22A rated current at 500 V | 125 A | |
| AC-22A rated current at 690 V | 125 A | |
| AC-23A rated current at 380–415 V | 90 A | |
| AC-23A rated current at 500 V | 70 A | |
| AC-23A rated current at 690 V | 50 A | |
| AC-23A operational power | 45 kW | |
| AC-31B rated current at 380–415 V | 125 A | |
| AC-33B rated current at 380–415 V | 80 A | |
| Rated operational voltage | 800 V | |
| Rated insulation voltage | 800 V | |
| Rated impulse withstand voltage | 8 kV | |
| Rated short-time withstand current | 2.5 kA rms for 1 s | |
| Conventional free-air thermal current | 125 A at 40 °C | |
| Conventional enclosed thermal current | 125 A | |
| Fourth pole position | Right side | |
| Fourth pole type | Switched, simultaneous function | |
| Switch operating mechanism | Mechanism at the end of the switch | |
| Mounting type | Base mounting | |
| Operating mode | Front operated | |
| Line terminal arrangement | Top in / bottom out or bottom in / top out | |
| Handle colour | Black | |
| Handle type | Direct mounted | |
| Pollution degree | 3 | |
| Power loss | 6.3 W | |
| Dimensions (W × H × D) | 283 × 100 × 116 mm | |
| Weight | approx. 1.86 kg |
Frequently Asked Questions
What is the ABB OTM125F4CMA24D used for?
The ABB OTM125F4CMA24D is a motorised change-over switch used for controlled switching between two electrical power sources in industrial, commercial and standby power distribution systems.
What is the current rating of the ABB OTM125F4CMA24D?
The OTM125F4CMA24D has a rated operational current of 125 A for AC-21A and AC-22A duty at voltages up to 690 V.
What voltage is required for the OTM125F4CMA24D motor operator?
The integrated motor operator is designed for a 24 V DC operating supply.
What is the power rating of the ABB OTM125F4CMA24D?
The OTM125F4CMA24D has an AC-23A operational power rating of 45 kW, with an AC-23A current rating of 90 A at 380–415 V.
How many poles does the ABB OTM125F4CMA24D have?
The OTM125F4CMA24D is a four-pole change-over switch, with the fourth pole positioned on the right side and switched simultaneously with the other poles.
Trusted ABB Motorised Switching Technology
ABB OTM motorised change-over switches combine proven OT switching technology with integrated motor operation, providing dependable remote source selection for industrial, commercial and standby power distribution systems.
