Detailed description - Timer relay ERV-08M (0.1 s - 100 h), Un: 12-230 V AC/DC

The ERV-08M timer relay is a universal delay relay designed to control delayed switching on after power supply voltage is applied. It offers a wide time range from 0.1 seconds to 100 hours, a universal 12-230 V AC/DC power supply, simple operation, and DIN rail mounting.

Suitable for automation applications, controlling fans, motors, lighting, contactors, and other devices requiring delayed start.

Main features

• Delayed NO contact activation function upon voltage application

• Wide time range: 0,1 s - 100 h

• Universal power supply: 12-230 V AC/DC (4 VA)

• 1× SPDT switching contact ( NO/NC), 5A/250VAC

• Two LED indicators:

  • ON (red) - power presence

  • OUT (green) - output relay status

• Time setting with two rotary potentiometers

• Mountable on DIN rail 35 mm

• IP20 protection

• Compact dimensions: 91 × 18 × 65 mm

Controls and functions

LED indicator

• ON (red) - relay is powered

• OUT (green, steady on) - output relay is energized (contact 2-3 connected).

• OUT (green, flashing) - countdown in progress for switching

Time setting

The timer relay allows creating an accurate delay using two potentiometers:

1. Potentiometer "t" (0.1 to 10)
   - fine adjustment in percentage of the full range
   - 0.1 = 1%, 10 = 100%.

2. Potentiometer "TS" - range selection:

   • A = 10 s

   • B = 100 s

   • C = 10 min

   • D = 100 min

   • E = 10 h

   • F = 100 h

Time change is activated on the next power connection.

Switching function

1) ON Delay - delayed turn-on (terminals 2-3, NO)

• When power is connected , the set time countdown begins

• After the time elapses, the turn-off relay (RLY) is activated - contact 2-3 (NO → COM) switches on.

2) Turn-off delay via NC contact (terminals 2-1)

• Contact 2-1 (NC) switches even without power supply.

• When power is connected, the countdown begins

• Contacts open after the time elapses 1-2

Using

ERV-08M timing relays are used in applications where delayed activation is needed after an event occurs:

• The fan turns on only after the light is switched on (WC, bathroom)

• Lighting in the garage or corridor after the door is opened

• Gradual motor start

• Delayed switching of contactors

• Sequential switching of multiple circuits

• Delayed device start

The countdown always starts when current is supplied to the relay.