Hager SFT125 25A 1 Pole Centre Off Changeover Switch Top Common Point

Description

Two supplies, a centre OFF, one module.

The Hager SFT125 is a 1 pole, 25A centre-off modular changeover switch that selects between two power sources for one circuit, 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 on a single DIN rail module, suited to caravans, RVs and modular sub-boards.

Key Features

• 25A rated current (IN)
• 1 pole (1P) centre-off changeover, top common point
• Centre OFF isolating position
• Single module (17.5mm) width
• Rated operational voltage 230V AC, 50-60Hz
• Utilisation categories AC21 and AC22 at 25A
• 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 Centre-Off Changeover Switch?

A centre-off changeover switch selects between two power sources for the same circuit, with a middle OFF position that isolates both. The SFT125 is a single-pole version with the common terminal at the top, so the shared connection lands above and the two selectable sources connect below. The OFF position gives a clear point of isolation between the two supplies.

Compact Sub-Board and RV Fit

At one module wide, the SFT125 fits neatly into a distribution board or a caravan sub-board without consuming space. It mounts on standard 35mm DIN rail, accepts rigid conductors up to 16mm2 through screw terminals, and is rated for utilisation categories AC21 and AC22 at 25A, covering resistive and mixed inductive loads.

Built to Last

Rated for 200,000 mechanical operations and 25,000 electrical operations at nominal load, the SFT125 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 SFT125 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 with a defined off point in between.

Q: What size cable can the SFT125 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 SFT125 and the SFL125?
A: Both are 1 pole 25A changeover switches with a top and bottom common point respectively. The SFT125 is centre-off with an OFF isolating position and a top common point; the SFL125 has a bottom common point and no centre-off position.