Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
OT250E04CLK ABB 250A 4-Pole I-I+II-II Manual Change-Over Switch
ABB OT250E04CLK is a 250 A 4-pole I-I+II-II manual closed-transition change-over switch with a direct-mounted handle for controlled power source transfer.
£686.47
Why Choose the ABB OT250E04CLK Manual Change-Over Switch?
The ABB OT250E04CLK is a robust 250 A 4-pole manual change-over switch designed for controlled transfer between two electrical power sources. As part of the ABB OT change-over switch range, this model features I-I+II-II closed-transition operation and a direct-mounted handle for straightforward local switching in industrial and commercial power distribution systems.
Unlike conventional open-transition change-over switches, the OT250E04CLK provides an I+II overlap position between source positions I and II. This make-before-break switching arrangement allows both source contacts to be connected during the transition, making the switch suitable for specifically engineered applications where closed-transition manual change-over is required.
With a rated current of 250 A and a 4-pole configuration, the OT250E04CLK provides simultaneous switching across four poles. Its direct-mounted operating handle enables manual operation at the switch itself, while the ABB OT construction provides dependable switching performance for demanding electrical distribution installations.
Key Advantages
- Heavy-duty 250 A manual change-over switch for power distribution applications.
- 4-pole configuration for simultaneous switching across four conductors.
- I-I+II-II switching sequence provides closed-transition operation.
- Make-before-break operation provides an overlapping I+II position during transfer.
- Direct-mounted handle provides straightforward local manual operation.
- ABB OT construction provides reliable switching performance in demanding installations.
Key Features
- ABB OT change-over switch series.
- 250 A rated current.
- 4-pole manual change-over configuration.
- I-I+II-II closed-transition operation.
- Make-before-break source transfer arrangement.
- Direct-mounted operating handle.
- Front-operated switching arrangement.
- Base-mounted construction for electrical distribution assemblies.
- Designed for manual selection and transfer between two power sources.
Reliable Closed-Transition Power Source Change-Over
Closed-transition change-over switches use a make-before-break switching sequence in which the incoming source is connected before the outgoing source is disconnected. The ABB OT250E04CLK provides I-I+II-II operation, creating an overlapping I+II position during manual transfer between its two source positions.
This operating arrangement is intended for electrical systems specifically designed to permit closed-transition source transfer. The 250 A current rating, four-pole configuration and direct operating handle make the OT250E04CLK a practical solution for switchboards and distribution assemblies requiring local manual change-over control.
Typical Applications
- Manual transfer between compatible electrical power sources.
- Industrial low-voltage distribution switchboards.
- Generator and mains change-over systems designed for closed-transition operation.
- Commercial and infrastructure power distribution systems.
- Four-pole source-transfer applications.
- Electrical distribution assemblies requiring direct manual control.
Technical Specifications
Tick the specs you need, then view products that match.
| Mounting Type | Base mounting | |
|---|---|---|
| Device Type | Manual changeover switch | |
| Operation | Manual | |
| Series | OT Change-Over Switches | |
| ABB order code | 1SCA117787R1001 | |
| Product type | Manual change-over switch | |
| Rated current | 250 A | |
| Number of poles | 4 | |
| Operation | Manual | |
| Switch positions | I-I+II-II | |
| Transition type | Closed transition / make-before-break | |
| Handle type | Direct-mounted handle | |
| Operating mode | Front operated | |
| Mounting type | Base mounting | |
| Rated insulation voltage | 1000 V | |
| Rated impulse withstand voltage | 12 kV | |
| Rated short-time withstand current | 8 kA for 1 s | |
| Standard | IEC 60947-3 |
Frequently Asked Questions
What is the ABB OT250E04CLK used for?
The ABB OT250E04CLK is used for manual change-over between two electrical power sources in systems designed for closed-transition source transfer.
What is the rated current of the OT250E04CLK?
The OT250E04CLK has a rated current of 250 A.
How many poles does the ABB OT250E04CLK have?
The OT250E04CLK is a 4-pole manual change-over switch, allowing four conductors to be switched as part of the source-transfer operation.
What does I-I+II-II operation mean?
The I-I+II-II sequence means the switch provides source I, an overlapping I+II position and source II, creating a make-before-break or closed-transition switching sequence.
What type of handle does the OT250E04CLK use?
The OT250E04CLK is configured with a direct-mounted operating handle, allowing the switch to be operated manually at the device.
Trusted by Electrical Professionals Worldwide
ABB OT change-over switches are used in industrial and commercial electrical distribution systems where dependable source selection, robust switching performance and reliable manual operation are required.
