Hager SFT240 40A 2 Pole Centre Off Changeover Switch Top Common Point

Description

40A across both poles, with a centre OFF.

The Hager SFT240 is a 2 pole, 40A centre-off modular changeover switch that transfers a circuit between two power sources across both the active and neutral, 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, and its 40A rating suits heavier mains-to-backup switching in caravans, RVs and residential panels.

Key Features

• 40A rated current (IN)
• 2 pole (2P) centre-off changeover, top common point
• Centre OFF isolating position (I-0-II)
• 2 modules (35mm) width
• Rated operational voltage 230V AC, 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 2 Pole Centre-Off Changeover Switch?

A two-pole changeover switch transfers both conductors of a single-phase circuit, typically active and neutral, between two power sources at once. The centre-off version adds a middle OFF position that isolates the circuit from both supplies. The SFT240 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).

Heavier Mains-to-Backup Switching

At 40A, the SFT240 handles larger single-phase loads than the 25A models in the range, making it a good fit where a full two-wire changeover is needed between a primary supply and a backup such as a generator. The centre OFF gives a clear point of isolation during transfer. At two modules wide it still fits compactly into a distribution board or a caravan sub-board, mounts on standard 35mm DIN rail, and accepts rigid conductors up to 16mm2 through screw terminals.

Built to Last

Rated for 200,000 mechanical operations and 25,000 electrical operations at nominal load, the SFT240 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 centre-off position on the SFT240 do?
A: It provides a middle OFF position that isolates the circuit from both power sources, so you can switch cleanly between supply A and supply B across both poles with a defined off point in between.

Q: What size cable can the SFT240 take?
A: Its screw terminals accept rigid conductors from 1.5 to 16mm2 and flexible conductors from 1.5 to 10mm2, tightened to 1.8Nm.

Q: What is the difference between the SFT240 and the SFT225?
A: Both are 2 pole centre-off changeover switches with a top common point and the same 2-module footprint. The SFT240 is rated 40A; the SFT225 is rated 25A.