Project Description

Audio Frequency(AF) Track curcuit

It is a non-insulated track circuit device designed for AC or DC train section where there is electromagnetic interference (mainly generated from the harmonic wave of the electric line power supply). It detects the presence/absence of the train, does not carry a speed code.

Transmitter module

Transmitter module

Product Information

The transmission module used in the stations and for relay and block generates a stable track detection signal and sends it to the rail through the tuning unit.

Online Inquiry


  • Detecting the presence of trains to prevent accidents
  • Achieve safe operation of trains by communicating the train speed and vehicle operation information to the locomotive


Category Rating
Rated Voltage DC 24V
Operating Voltage DC 22.5V~30.5V
Current Consumption Less than 2.2A
Modulation Rate 174㎳~260㎳(4.8㎐)
Insulation Resistance More than DC 500V/50㏁
Size(㎜) 73(W)×300(L)×177(H)
Type A(1,699㎐), B(2,296㎐), C(1,996㎐), D(2,593㎐)
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