The ATS01 (Altistart 01) series by Schneider Electric is a range of compact soft starters designed for starting and stopping asynchronous motors from 0.55 to 45 kW. With an integrated bypass contactor and a slim 45 mm housing, ATS01 easily integrates into standard motor starter assemblies and electrical cabinets. The series covers a current range from 3 to 85 A at voltages from 110 to 480 V, making it a versatile solution for pumps, fans, conveyors, and other industrial equipment. Browse all soft starters in our catalogue.

ATS01 Product Lineup

The Altistart 01 series includes models for single-phase and three-phase networks with various current ratings. Below are the main models available for order:

Model	Rated Current	Supply Voltage	Motor Power	Application
ATS01N103FT	3 A	110–480 V	0.55–1.1 kW	Small pumps, fans
ATS01N106FT	6 A	110–480 V	0.75–3 kW	Circulation pumps, compressors
ATS01N109FT	9 A	110–480 V	1.1–4 kW	HVAC systems
ATS01N112FT	12 A	110–480 V	1.5–5.5 kW	Industrial pumps, conveyors
ATS01N125FT	25 A	110–480 V	4–11 kW	Heavy-duty pump stations
ATS01N222QN	22 A	380–415 V	7.5–11 kW	Three-phase drives, conveyors
ATS01N232QN	32 A	380–415 V	15 kW	Industrial installations

Altistart 01 Key Advantages

Compact 45 mm housing — standard width for side-by-side mounting with contactors and circuit breakers
Integrated bypass contactor — automatic bypass after ramp-up, reducing heat dissipation
Wide voltage range — 110 to 480 V, suitable for single-phase and three-phase networks
Potentiometer adjustment — ramp time and starting current limit are set without additional tools
Motor protection — built-in thermal and overload protection

How to Select the Right ATS01

When choosing an ATS01 soft starter, consider the following parameters:

Motor rated current — select a model with a rated current equal to or exceeding your motor current. For example, a 5.5 kW motor (400 V) pairs well with the ATS01N212QN rated at 12 A.
Supply voltage — FT-suffix models operate across 110–480 V, QN-suffix models are rated for 380–415 V.
Phase count — N1xx series models are for single-phase supply, N2xx series for three-phase.
Starting conditions — for heavy-duty starts (compressors, crushers), consider the ATS22 or ATS48 series with advanced features.

Other Soft Starter Series

In addition to ATS01, our catalogue features other soft starter series for various applications:

Schneider Electric ATS22 — for motors up to 400 kW with advanced protection
Schneider Electric ATS48 — industrial soft starters with intelligent control
Schneider Electric ATS480 — next generation with communication protocol support
Danfoss MCD200 — alternative series for standard applications
Danfoss MCD500 — heavy-duty soft starters for demanding environments

Warranty & Support

All Schneider Electric ATS01 soft starters come with an official manufacturer warranty. We provide delivery across Ukraine via Nova Poshta and Ukrposhta. Bank transfer for businesses and cash on delivery for individuals are available. Our engineers will assist with equipment selection and commissioning.

Frequently Asked Questions

How is Altistart 22 different from ATS48 and the new ATS480?

ATS22 is the universal base Altistart series with internal bypass; it controls voltage during ramp-up and offers a plain stop ramp. ATS48 adds torque control (TQ-Control) and a full pump stop function for centrifugal pumps, but its bypass is external (a separate contactor in the panel). ATS480 is the new generation and effectively replaces ATS48: TQ-Control, pump stop, plus internal bypass and richer comms (Modbus, optional Profinet / Ethernet IP). For a new pump or conveyor project with torque control, pick ATS480; on new builds the ATS48 no longer makes sense.

How many starts per hour can a soft starter handle?

It depends on whether the unit has an internal bypass. Series with bypass (ATS22, ATS480, Danfoss MCD500, ABB PSR / PSE / PSTX, Veichi SS70) typically take 10-30 starts per hour, because the thyristors switch off after ramp-up and stop heating. Series without bypass (Schneider ATS01, Siemens SIRIUS 3RW30) tolerate 6-10 starts per hour. The exact figure is on the nameplate as AC-53a or AC-53b. If you need over 20 starts per hour with heavy torque, a VFD is more economical than paying for a premium soft starter.

Soft starter or VFD for a pump?

Driven by start frequency and the need to vary flow. If the pump runs in on / off mode by a pressure or level sensor, at up to 10-12 starts per hour, and does not need to hold constant pressure — a soft starter with pump stop (Schneider ATS48 / ATS480, Danfoss MCD500) is two to three times cheaper and fully removes water hammer. If the pump needs to hold network pressure, runs with frequent starts (drainage, sewage), or you need energy savings — pick a VFD with PID. A soft starter gives no savings under steady-state load.

Does a soft starter save energy?

Only on starting losses and through reduced mechanical wear. Under steady-state load the motor is fed straight from the mains via bypass, so consumption matches direct-on-line. Some series (Schneider ATS22, ABB PSTX) offer Inside Delta or Energy Saver, lowering voltage on underloaded motors — but real-world savings are 1-3% and only meaningful on motors permanently running below 50% load. If energy saving is the main goal, the right tool is a VFD with PID, not a soft starter.

What is pump stop and why use it?

Pump stop is a smooth pump-motor stopping function where the soft starter lowers voltage over 10-30 seconds so that pump speed and water-column speed in the pipeline decrease in step. Without pump stop the water column behind the check valve keeps moving by inertia, the valve slams shut and pressure spikes by 5-10 bar — that is water hammer, which breaks valves and welds. The function exists on Schneider ATS48, ATS480, ATS490, ATS430, Danfoss MCD500, ABB PSTX. It does not exist on ATS01, ATS22, MCD200, SIRIUS 3RW30 — these series should not be picked for pump applications.

Do I need an external bypass contactor?

It depends on the series and on start frequency. Series without internal bypass (Schneider ATS01, ATS48, Siemens SIRIUS 3RW30) — an external contactor is recommended for more than 6-10 starts per hour or for 24/7 service; otherwise the thyristors overheat from continuous commutation. Series with internal bypass (ATS22, ATS480, Danfoss MCD500, ABB PSR / PSE / PSTX, Veichi SS70) — no separate contactor needed, bypass engages automatically after ramp-up. The AC-53b figure on the nameplate already accounts for the bypass in start time and duty cycle.

Is a soft starter suitable for frequent starts of a drainage pump?

Usually not. Drainage and sewage pumps cycle dozens of times per hour by tank level — that is 30-60 start / stop cycles. No soft starter series will last that duty: thyristors and internal bypass contactors are typically rated for 10-30 starts per hour. The right tool is a pump VFD (Veichi AC10 with sleep mode, INVT GD20 with PID) running continuously at minimum speed and ramping up when the tank fills — there are effectively no real starts at all.