One of the main reasons for the Zelio Logic Relays turning off automatically is input supply voltage fluctuation.
The voltage limit for Zelio Logic Relays like SR2 B121JD, SR2 B201JD and SR3 B261JD, with standard input voltage 12V DC, is 10.4 VDC to 14.4 VDC.
The Zelio Logic Relays work properly within the band 10.4 VDC to 14.4 VDC. The moment the input voltage either falls below the lower limit (10.4 VDC) or goes above upper limit (14.4 VDC), the Zelio Logic Relay does not behave properly and turns off.
If problem of voltage fluctuation is present suggestion is to use Constant Voltage Transformer (CVT) or Automatic Voltage Stabilizer along with Regulated Power Supply module.