Motorised transfer switch

A motorised source-transfer switch is a switching and isolating device fitted with a built-in operating motor, designed to switch manually or remotely between two electrical power supplies. Socomec's ATyS d range covers ratings from 40 A to 6300 A and complies with IEC 60947-6-1. Its motorisation guarantees a constant, repeatable switching time, without incorporating automatic network-fault detection logic.

Operating principle and remote control of the motorised source-transfer switch

Motorised architecture and consistent switching time

The operating motor built into the motorised source-transfer switch ensures the same switching time from one operation to the next. Our installation experience confirms that this repeatability is essential for sequences synchronised with PLCs or supervision systems. The reinforced polyamide body and silver-plated copper contacts contribute to the device's mechanical and electrical strength in continuous service.

Control modes compatible with the ATyS d motorised source-transfer switch

The ATyS d accepts commands from a remote push-button, an industrial PLC or a supervision interface. In the field, we find that this control flexibility meets the needs of installations where the switching decision comes from external logic, programmed according to the site's specific operational constraints. The absence of built-in automatic detection logic distinguishes this motorised source-transfer switch from the ATyS M, S, G or p versions, which incorporate this function.

Ranges and ratings available for the Socomec ATyS d motorised source-transfer switch

Rated current range and adaptability to installations

The ATyS d range extends from 40 A to 6300 A, covering the needs of both tertiary panels and high-power industrial distribution. Feedback from design offices shows that this range of ratings makes it possible to standardise the choice of motorised source-transfer switch on a single project despite different current levels across outgoing circuits.

Distinction from other motorised devices in the ATyS range

Unlike the ATyS M motorised source-transfer switch, which incorporates automatic detection and control logic, or the ATyS S with its static transfer solution, the ATyS d is limited to the motorised execution of an external command. Our standard practice favours this version when the building's energy management system or the industrial DCS already handles all the switching intelligence.

Typical applications and implementation of the motorised source-transfer switch

Tertiary installations with centralised supervision

In office buildings, shopping centres or hospital infrastructure, the ATyS d motorised source-transfer switch allows scheduled switching to be carried out from a control room. We find that this function removes the need for an operator to travel to the electrical panels, particularly during transfer drills or planned maintenance operations on one of the sources.

Industrial processes controlled by a programmable logic controller

In industrial environments, the motorised source-transfer switch integrates into PLC control chains for transfers triggered by production criteria rather than network faults. Our installation feedback shows that this approach preserves continuity of service for sensitive processes while maintaining full traceability of operations in the SCADA system.

Frequently asked questions

What is the difference between an ATyS d motorised source-transfer switch and an ATyS M automatic transfer switch?

The ATyS d only executes an external switching command via its motorisation, whereas the ATyS M incorporates network-fault detection logic and automatically triggers the transfer. The choice depends on whether an external energy management system is present on the installation.

Can the ATyS d motorised source-transfer switch be controlled by a simple push-button?

Yes, the motorisation accepts a wired push-button command, in addition to PLC or supervision interfaces. This dual control capability allows a gradual commissioning process, starting locally then moving to integrated mode.

Which standard applies specifically to motorised source-transfer switches?

The IEC 60947-6-1 standard defines the construction and test rules for connection devices, including source-transfer switches operating in switching duty. It guarantees the device's breaking capacity and short-circuit withstand.

Is the switching time of the motorised source-transfer switch guaranteed across the whole rating range?

The built-in motorisation ensures a constant, repeatable operating time regardless of position within the 40 A to 6300 A range. This characteristic is essential for timing coordination with upstream circuit breakers and protective relays.