Electronic safety timer

We designed the MELI family of electronic safety timers for railway signalling applications. The devices perform timing tasks of different durations at different safety levels.

Our MELI-01 timers have two-channel monitored operation and a wide timing range, in the order of minutes.

Our MELI-02 timers are intended for shorter timing tasks in applications where a drastic shortening of the time must be ruled out.

The timers operate from a nominal 24 V DC supply and can be powered directly from a battery-backed supply. For other supply voltages, 24 V must be provided by an external converter (MA-DC/DC).

They are usually built as a unit matching the design and dimensions of the D55 single-width rack unit, but we also make a double Eurocard version under the type designation MELI-01p.

Technical data

• Supply voltage: 24 V DC
• Timing:
  • MELI-01: 1, 2, 3 or 6 minutes (set in production)
  • MELI-01p: 7.5 s – 24 min (programmable, 14 discrete values)
  • MELI-02: 12 s, 16 s
• Setting accuracy: 2%
• Built-in relays: H-462/1 safety relay