OMRON H3DR-A

This is an analog multifunction time relay (timer) from the OMRON H3DR-A series.

This industrial device is used to automate processes that require switching loads on or off at specific intervals.

Key Features

• Model: OMRON H3DR-A.

• Power Supply: Universal - 24 VDC or 24 VAC, 50/60 Hz. Connects to terminals A1 (+) and A2 (-).

• Time Range: Adjustable from 0.1 seconds to 120 hours.

• Contact Capacity: The relay can handle up to 5 A at 250 VAC (resistive load).

Description of Operating Modes (Schemes A, B, C, D, E)

The housing shows timing diagrams for the different modes, which are selected by a switch on the front panel :

• A (ON-delay): On-delay. After a signal is applied, the relay is activated after a time of t.

• B (Flicker OFF start): Cyclic mode (flickering), begins with a pause.

• C (Signal ON/OFF-delay): On-delay and off-delay upon control signal.

• D (Signal OFF-delay): Off-delay after the control signal is opened.

• E (Interval): Interval mode. The relay is activated immediately upon signal application and is deactivated exactly after a time of t.

Contact Assignment (Pinout)

• A1 / A2: Power input.

• B1 (RESET): Timer reset.

• C1 (START): Start the timing.

• D1 (GATE): Pause (stop timing without reset).

• 15–16/18: First group of changeover contacts (15 – common, 16 – normally closed, 18 – normally open).

• 25–26/28: Second group of changeover contacts.

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