OTM250E4CM110V ABB 250 A 4-Pole 110–125 V AC/DC Motorised Changeover Switch

Why Choose the ABB OTM250E4CM110V Motorised Changeover Switch?

The ABB OTM250E4CM110V is a 250 A four-pole motorised changeover switch designed for controlled transfer between two electrical supplies in low-voltage power distribution systems. Part of ABB's OTM motorised changeover range, it combines two mechanically interlocked switching paths with an integrated motor operator for dependable remote source selection.

The OTM250E4CM110V uses an open-transition I-0-II switching arrangement, ensuring the first supply is disconnected before the alternative supply is connected. Its four-pole construction switches all three phases and the neutral simultaneously, making it suitable for installations where complete source separation is required.

Rated at 250 A, the switch uses a 110–125 V AC/DC motor operating supply and provides AC-31B and AC-33B operational ratings of 250 A at 415 V. It is supplied with a handle for manual operation, terminal bolt hardware and male control-circuit connectors, providing a comprehensive solution for motorised changeover applications.

Key Advantages

• 250 A motorised changeover switch for remote source transfer applications.
• Four-pole switching provides simultaneous transfer of three phases and neutral.
• 110–125 V AC/DC motor operating voltage provides flexible control-supply compatibility.
• Open-transition I-0-II operation disconnects one source before connecting the other.
• Rated for 250 A AC-31B and AC-33B at 415 V.
• 8 kA short-time withstand current for 1 s supports demanding distribution applications.
• Integrated motor drive enables convenient remote switching and automation.
• Manual operating handle and installation hardware are supplied with the switch.

Key Features

• ABB OTM series motorised changeover switch.
• 250 A rated operational current.
• 4-pole construction.
• 110–125 V AC/DC motor operational voltage.
• Open-transition switching.
• I-0-II changeover functionality.
• 250 A AC-21A, AC-22A and AC-23A rating at 380–415 V, 500 V and 690 V.
• 250 A AC-31B and AC-33B rating at 415 V.
• Rated operational power of 140 kW at 380–415 V under AC-23A.
• 1000 V rated insulation voltage.
• 12 kV rated impulse withstand voltage.
• Direct-mounted black handle for manual operation.

Reliable Motorised Changeover for Power Distribution Systems

Motorised changeover switches provide controlled transfer between two power sources while maintaining electrical and mechanical separation between them. The ABB OTM250E4CM110V uses open-transition operation, moving through the OFF position before connecting the alternative source and thereby providing break-before-make source transfer.

Its integrated motor operator allows the changeover process to be controlled remotely, while the supplied handle enables manual operation when required. With 250 A four-pole switching, simultaneous neutral operation and robust AC-31B and AC-33B ratings, the OTM250E4CM110V is suited to distribution systems requiring dependable source selection and transfer.

Typical Applications

• Mains and generator changeover systems.
• Dual-supply electrical distribution boards.
• Standby power installations.
• Industrial power distribution systems.
• Commercial and infrastructure electrical systems.
• Remote-controlled source selection.
• OEM switchgear and power distribution assemblies.