Omron H3CR-A8E 8-Pin Timer with Instantaneous Contact

H3CR-A8E: timer with a time-limit and an instantaneous contact

The Omron H3CR-A8E is an 8-pin version of the H3CR-A timer that carries two single-pole changeover relay outputs in place of one double-pole output: one SPDT contact acts after the set time and the other SPDT contact follows the supply instantly. Seven Star LLC supplies the H3CR-A8E in Oman and the GCC as an independent supplier in Muscat. The page below explains the model code and what to confirm before ordering.

• H3CR-A is the multifunctional timer type.
• 8 means an 8-pin plug-in form.
• E means relay output SPDT with an additional instantaneous SPDT relay output.
• The supply is appended to the order: 100-240AC/100-125DC, or 24-48AC/DC for the low-voltage version.

The instantaneous contact lets a single timer both signal that power is present and control a delayed action, removing the need for an auxiliary relay in many small sequences.

H3CR-A8E technical specifications

Figures come from the Omron H3CR datasheet. The low-voltage version is listed as 24 to 48 VAC/VDC and is not the same voltage range as the other H3CR-A models, so do not substitute without checking.

How H3CR-A8E handles timing

The H3CR-A8E contains the same timing core as the other 8-pin timers: a clock and counter compare the elapsed time with the selected range, and the time-limit relay changes state when the preset is reached. The second relay is not under timer control; it is driven directly from the supply so its contact changes as soon as power is applied.

Five power-start modes are provided. In ON-delay the delayed contact closes after the set time. In interval mode the delayed contact is made at power-up and released at the set time. In flicker modes it alternates, and in one-shot it gives a single pulse. In all cases the instantaneous contact transfers at power-up regardless of the timing state.

The time unit and full-scale knobs combine to give 24 ranges on standard 0.05 s to 300 h models. Turning the set value below zero until the stop makes the output act instantly, which is a quick way to check wiring and sequence without waiting for a long time range to run out.

Sockets, accessories and related timers for H3CR-A8E

The H3CR-A8E sits beside the plain H3CR-A8, which gives two timed poles but no instantaneous pole. Choose A8E when the second contact must be live at once. It shares the 8-pin sockets and accessories of the family, and its shorter overall length with a P3G-08 socket helps in shallow cabinets.

Accessories listed for the family include the Y92F-30, Y92F-73 and Y92F-74 flush-mounting adapters, the Y92A-48B protective cover, Y92H-7 and Y92H-8 hold-down clips, Y92S-27 and Y92S-28 setting rings, Y92P-48GL and Y92P-48GB panel covers, and the Y92A-48G terminal cover for back-connecting screw sockets. The protective cover and flush adapters cannot be combined with the panel cover, so settle the front-panel arrangement before ordering.

Selection and ordering checklist for H3CR-A8E

Use this list before you send an enquiry for H3CR-A8E. Omron orders timers by model plus supply voltage, so the voltage is part of the order and cannot be added later.

• Confirm that one timed SPDT contact and one instantaneous SPDT contact meet the circuit; if two timed poles are needed use H3CR-A8.
• Choose the 100 to 240 VAC / 100 to 125 VDC version or the 24 to 48 VAC/VDC version.
• Pick the mode needed from A, B, B2, E and J, remembering all are power-start modes.
• Check contact loading against 5 A at 250 VAC / 30 VDC and 10 mA at 5 VDC minimum.
• Choose the 8-pin socket type and cover or flush adapter options.
• Note that the contact material is AgSnIn, which may suit inductive loads differently from the Ag-alloy used in other H3CR-A models.

Installation, commissioning and maintenance of H3CR-A8E

Install the H3CR-A8E in an 8-pin socket and fix it with the correct hold-down clip. With a P3G-08 back-connecting socket the unit protrudes 75 mm or less behind the panel on the high-voltage version, which is useful in shallow enclosures.

• Label which contact is time-limit and which is instantaneous on the panel drawing, since both are SPDT and easy to confuse.
• Verify the instantaneous contact at power-up before relying on the timed contact.
• Use the zero-set position to test timed output wiring quickly.
• Keep supply within 85% to 110% of the rated value.
• Stock a spare with the same voltage code, as the 24 to 48 VAC/VDC and 100 to 240 VAC versions are not interchangeable.

Typical H3CR-A8E applications in Oman and the GCC

Typical uses are interlocks where a lamp or contactor must come on at once and a second device is released after a delay: lubricating-oil pump pre-start with a delayed main motor, damper opening with delayed fan start, and boiler purge sequences on packaged heaters. The instantaneous contact can also feed a plant status input while the timed contact controls a valve.

In GCC process plants, space inside marshalling and local control boxes is limited, so a single timer that replaces a timer plus an auxiliary relay can simplify wiring and reduce terminal count. Ambient temperatures above the 55°C limit should be avoided with sunshades or ventilation.

H3CR family compared with H3CR-A8E

The table places H3CR-A8E next to the other timers in the same H3CR catalogue so you can confirm that you are asking for the right base model before the voltage is added.

Information to send with an RFQ for H3CR-A8E

• Part number H3CR-A8E, supply voltage version and quantity.
• Required mode and time range.
• Load on each contact, voltage and current.
• Socket and accessory choices.
• Whether a spare unit of identical voltage is required.
• Delivery location.

Documents and quotation

A datasheet for the H3CR series is attached on this page, covering the model legend, time ranges, ratings, timing charts, dimensions and safety precautions for H3CR-A8E and its siblings. Please read the precautions section before wiring.

Seven Star LLC is an independent supplier in Muscat and is not affiliated with the manufacturer. Send the part number H3CR-A8E, the supply voltage and the quantity, and we will confirm availability and lead time for Oman and the GCC.