Description
This is a straightforward, electromechanical 24‑hour timer intended for one‑circuit switching where you need reliable daily on/off schedules rather than complex programming. The mechanism is a synchronous motor‑driven dial with captive tappets, giving 15‑minute resolution across a single 24‑hour cycle. It’s the kind of rugged, no‑nonsense timeswitch used to automate immersion heaters, simple lighting circuits and fan or heater circuits where a single daily programme is sufficient.
How it works and what it will control
The OP‑TS111.1 uses a mains synchronous motor so the dial runs in step with mains frequency and repeats the same 24‑hour programme every day. You set on/off periods by pushing the tappets in or out around the dial; there’s a manual selection that lets you force ON, OFF or timed/automatic. The switched output is a volt‑free SPDT contact, which means it provides a clean changeover contact suitable for switching a receiver or the control input of a boiler, panel heater or a contactor.
Load ratings are the practical constraint: the switch contacts are rated at 16 A for resistive loads and 8 A for inductive loads. The manufacturer listing also states suitability for LED lighting up to 100 W and an incandescent lamp load rating of about 1,300 W. Because the unit is an electromechanical timer with a single relay contact, larger or highly inductive loads (for example large motors or multiple heaters) should be switched via a suitably rated contactor rather than driven directly from the timeswitch.
Installation, mounting and practical points
The module is designed for use on UK mains (220–240 V AC, 50 Hz) and offers flexible mounting — surface, flush or DIN‑rail — so it will fit in a small utility cupboard, on a backboard or into distribution enclosures. The unit is compact and light, with typical dimensions around 106 × 72 × 52 mm and a weight in the region of 0.18 kg. The wiring is straightforward but, as with any mains device, wiring and commissioning should be carried out by a qualified electrician. The timer includes an earth park terminal and cable clamps for tidy installation.
Because it is a synchronous (non‑reserve) timer, the dial must be set and rotated in the correct direction (clockwise) when setting the current time; the mechanism is not designed to be rotated anti‑clockwise. Tappet intervals are 15 minutes, so short on/off bursts under that duration aren’t possible without auxiliary equipment.
Everyday suitability and limitations
Where this timeswitch excels is simple, repeatable daily schedules: immersion heaters, display lighting, ventilation fans or basic electric heaters that only need the same on/off programme each day. It’s reliable, inexpensive and uncomplicated — useful when you don’t want or need digital programming or multi‑day calendars.
Limitations to be aware of: the switching resolution is coarse (15‑minute steps), there’s no battery reserve for timekeeping (it’s synchronous with the mains so a power interruption will stop the timer), and it has modest contact ratings. The unit’s specification warns that discharge lamps should not be switched directly without a contactor; similarly, if you intend to control many LED fixtures or modern electronic loads, verify inrush currents and minimum load behaviour first — even though a maximum LED load of 100 W is quoted, some LED drivers behave oddly when switched by small mechanical relays.
Key specifications
- Cycle: 24‑hour synchronous dial (single daily programme)
- Resolution: 15‑minute tappet intervals; captive tappets
- Supply: 220–240 V AC, 50 Hz
- Contacts: volt‑free SPDT
- Load rating: 16 A resistive, 8 A inductive
- Quoted lamp/load guidance: LED up to 100 W; incandescent up to ~1,300 W
- Mounting: surface, flush or DIN‑rail
- Typical dimensions: 106 × 72 × 52 mm; weight ≈ 0.18 kg
- Manual selector: Timed / OFF / Constant (manual override)
Who this suits and a quick checklist
If you have a single circuit that needs a fixed daily schedule and you prefer an analogue, low‑complexity solution, this is a sensible choice. Installers and landlords often choose units like this for boiler timers, immersion heaters and security or display lighting where the same pattern repeats every day.
Before you buy, check these points: the circuit you intend to switch must be within the contact ratings (or be switched via a contactor); if you require multiple distinct programmes across the week or battery reserve through power outages, move to a multi‑day or quartz/reserve model; and for switching modern LED loads, verify compatibility or consider a small contactor to protect the timer contacts.
Summary
In short, the OP‑TS111.1 is a practical, low‑cost 24‑hour synchronous timeswitch for single‑circuit, repeatable daily control. Its mechanical simplicity and flexible mounting options make it easy to fit into domestic and light‑commercial installations, provided you respect the contact ratings and the limits of an analogue 15‑minute dial timer.
