Hager SFT440 40A 4 Pole Centre Off Changeover Switch Top Common Point

Description

Full three-phase changeover, with a centre OFF.

The Hager SFT440 is a 4 pole, 40A centre-off modular changeover switch that transfers a three-phase circuit between two power sources, switching all four conductors at once with a clear OFF isolating position in the middle. With its common point at the top, it gives a positive three-position transfer between supply A, OFF, and supply B (I-0-II), making it well suited to mains-to-generator switching on three-phase boards in commercial, event and RV settings.

Key Features

• 40A rated current (IN)
• 4 pole (4P) centre-off changeover, top common point
• Centre OFF isolating position (I-0-II)
• 4 modules width
• Rated operational voltage 400V AC (three-phase), 50-60Hz
• Utilisation categories AC21 and AC22 at 40A
• Screw terminals, 1.5-16mm2 rigid / 1.5-10mm2 flexible
• 200,000 mechanical operations, 25,000 electrical (AC21/AC22)
• IP20, DIN rail mounting
• Rated insulation voltage Ui 440V, impulse withstand Uimp 4kV

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What Is a 4 Pole Centre-Off Changeover Switch?

A four-pole changeover switch transfers all four conductors of a three-phase circuit, the three phases plus neutral, between two power sources at once. The centre-off version adds a middle OFF position that isolates the circuit from both supplies. The SFT440 places the common point at the top, so the shared connections land above and the two selectable sources connect below, with a defined OFF between them (I-0-II).

Three-Phase Mains-to-Generator Transfer

Rated 400V and switching four poles, the SFT440 handles a full three-phase transfer between a primary supply and a backup such as a generator. The centre OFF ensures both sources are isolated before you switch across. At four modules wide it mounts on standard 35mm DIN rail and accepts rigid conductors up to 16mm2 through screw terminals, making it a practical fit for three-phase distribution boards and event power setups.

Built to Last

Rated for 200,000 mechanical operations and 25,000 electrical operations at nominal load, the SFT440 is built for repeated switching over a long service life. An operating temperature range of -20 to 50 degrees Celsius suits it to a range of Australian installation environments.

Q: What does the Hager SFT440 do?
A: It is a four-pole manual changeover switch that transfers a three-phase circuit between two power sources, switching all four conductors at once with a centre-off position for safe isolation during transfer.

Q: What voltage is the SFT440 rated for?
A: It has a rated operational voltage of 400V AC, suiting three-phase supply, and a rated insulation voltage Ui of 440V.

Q: What is the difference between the SFT440 and the SFT240?
A: Both are 40A centre-off changeover switches with a top common point. The SFT440 is four-pole (4P, 4 modules) for three-phase circuits; the SFT240 is two-pole (2P, 2 modules) for single-phase.