> ## Documentation Index
> Fetch the complete documentation index at: https://docs.totemdigital.ro/llms.txt
> Use this file to discover all available pages before exploring further.

# Installing and wiring the ZYT16G-2a/3a timer

> Mounting dimensions of the ZYT16G-2a/3a timer and its three wiring methods: direct single-phase, single-phase with contactor, and three-phase.

The ZYT16G-2a/3a timer mounts on a rail and can control single-phase loads directly or, through a contactor, larger single-phase loads and three-phase loads.

<Warning>
  Disconnect mains power before any mounting or wiring work.
</Warning>

## Installation dimensions

| Dimension | Value |
| :- | :- |
| Width | 72 mm |
| Height | 120 mm |
| Distance between mounting holes | 100 mm |
| Mounting hole diameter | Φ4 mm |
| Width of the central clamping area | 35 mm |

## Wiring methods

### 1. Direct single-phase control

The controlled electrical system must be powered by single-phase current, and its power consumption must not exceed the rated capacity of the switch (3A resistive load).

Connect the power supply to the **POWER** terminals and the loads to the **OUT1** and **OUT2** outputs (plus **OUT3** on the ZYT16G-3a model).

### 2. Single-phase with contactor

The controlled electrical system is powered by single-phase current, but its power consumption exceeds the rated capacity of the switch (3A resistive load). In this case, connect the timer to an AC contactor.

### 3. Three-phase connection

The controlled electrical system is powered by three phases (N, A, B, C). Connect the timer to a three-phase contactor with a 220V/50Hz coil voltage.

<Note>
  The wiring diagrams (fig. 1, fig. 2, and fig. 3) are in the printed timer manual.
</Note>


## Related topics

- [ZYT16G-2a/3a timer: description and technical specifications](/en/timere-electronice/zyt16g/prezentare.md)
- [ZYT16G timer not working: replacing the AA battery](/en/timere-electronice/zyt16g/inlocuire-baterie.md)
- [Programming the ZYT16G timer: clock and on/off groups](/en/timere-electronice/zyt16g/programare.md)
- [Electronic timer user manuals by Totem Digital Romania](/en/timere-electronice/prezentare.md)
- [Installing the CN101 Timer: Dimensions and Wiring Diagrams](/en/timere-electronice/cn101/instalare-conectare.md)


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