Omron H3CR-A Solid-state Timer — Specs, Variants & Buyer Guide

By Abdullah Zahid
14 min read
Omron H3CR-A solid-state multifunction timer relay, 48x48mm DIN plug-in, used in industrial control panels

Omron H3CR-A Solid-state Multi-functional Timer: Specs, Wiring, Modes, and Buying Guide

Controls engineers and maintenance teams searching for the Omron H3CR-A are typically at one of two crossroads: replacing a failed timer in an existing panel without redesigning the circuit, or specifying a versatile analog timer for a new panel build. The H3CR-A is a DIN 48 x 48 mm, 11-pin plug-in solid-state multifunction timer relay supporting eight selectable operating modes — ON-delay, flicker, interval, signal ON/OFF delay, and one-shot among them — across a wide AC/DC supply range. Verifying the exact variant before ordering is the single most important step, and this guide walks through everything you need to make that call with confidence.

If you have already confirmed this is the right part, check current pricing and availability at LeadTime.ca — ships worldwide.

Who Should Buy the Omron H3CR-A — and Who Shouldn't

The H3CR-A is the right choice when all of the following apply to your application:

  • Your panel supply is AC100–240 V (50/60 Hz) or DC100–125 V and matches the H3CR-A variant you are ordering.
  • You require an 11-pin plug-in socket and a DPDT relay output configuration — not the 8-pin SPDT layout of the H3CR-A8 family.
  • Your required timing functions are covered by modes A, B, B2, C, D, E, G, or J — which include ON-delay, flicker, interval, signal ON/OFF delay, and one-shot.
  • Your time range requirement falls within the H3CR-A's selectable spans, from fractions of a second up to 300 hours.
  • You need UL, CSA, and CE approved hardware for a regulated industrial control panel.
  • Field swap-out speed matters — the plug-in base allows like-for-like replacement without rewiring the socket.

If you need an 8-pin SPDT configuration, a transistor output, a power-ON start behavior, or a digital display with numeric setpoint readout, the H3CR-A is not the right variant. Look instead at the H3CR-A8, H3CR-AS, H3CR-AP, or the H3DK and H5 series digital timers.

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What the H3CR-A Actually Does in a Control System

The H3CR-A sits between a control signal — whether that is a PLC output, a pushbutton, a relay contact, or a sensor — and the power device it is controlling, typically a contactor coil, pilot relay, solenoid, or lamp circuit. Its job is to introduce a precisely set time delay or interval between the control event and the output action. That single capability covers a surprisingly wide range of real automation problems: staggering motor starts to limit inrush, running a heater for a fixed interval, generating a flicker output for alarm annunciators, debouncing noisy sensor signals, and creating single-shot pulse outputs for sequencing logic.

What makes the H3CR-A particularly useful in general-purpose panels is that all eight operating modes — A, B, B2, C, D, E, G, and J — are accessible on the same physical unit through front-panel selector switches. A maintenance technician replacing a failed timer does not need to stock multiple mode-specific variants; one H3CR-A with the correct supply voltage and pin configuration covers the majority of timing functions encountered in relay-based and semi-PLC panels. Time ranges span from fractions of a second to 300 hours, selectable via a front-panel range switch, with final adjustment made by rotating the analog dial. Operation and timing status are indicated by front-panel LEDs, which aids both commissioning and fault diagnosis without the need for external instruments.

Typical System Architecture for the H3CR-A

The H3CR-A occupies the timing layer between a supervisory signal source and the load-side device it enables. In most installations the chain looks like this:

  • Panel supply (AC100–240 V or DC100–125 V) feeds the H3CR-A through the 11-pin socket power terminals, protected by an external fuse or circuit breaker as required by applicable standards.
  • A control signal — from a PLC discrete output, a pushbutton, a float switch, or a relay contact — is applied to the timer trigger input terminals.
  • The H3CR-A's internal solid-state timing circuit processes the input according to the selected mode and set time, then closes or opens the DPDT relay output contacts at the appropriate moment.
  • The relay output contacts switch the coil of a downstream contactor, interposing relay, solenoid valve, or alarm device.
  • The controlled load — motor, pump, heater, lamp, or actuator — responds to the contactor or relay commanded by the timer output.

Where the H3CR-A Gets Used: Industries and Scenarios

Motor starter panels in general manufacturing and assembly lines are the most common home for the H3CR-A. ON-delay mode (A) staggers the start of multiple motors or conveyors so inrush currents do not coincide, protecting both the supply and the overload relays downstream. In material handling and packaging, interval mode (E) runs a solenoid or pneumatic valve for a fixed time window after a trigger, independent of how long the trigger signal itself lasts — useful for metering or clamping cycles.

HVAC and building automation panels use the H3CR-A for fan and pump sequencing, introducing delays between compressor start and fan enable to protect refrigerant circuits. In water and wastewater applications, the timer provides pump run-on times after a level switch drops, preventing short-cycling. Food and beverage lines use the flicker modes to drive blinking indicator lights or intermittent conveyor jogs during cleaning cycles. Agricultural and irrigation systems rely on the wide time ranges — from seconds through to hundreds of hours — to manage long soak and drain cycles with a simple, low-cost panel component.

For OEM machinery builders, the H3CR-A's combination of wide supply range, multiple modes, and compact 48 x 48 mm footprint means one part number can handle the timing requirements across a range of machine variants, simplifying the bill of materials and spares provisioning for end customers.

Application Typical Deployment
Motor starter panel ON-delay mode to stagger multi-motor starts and limit inrush
Conveyor and material handling Delayed start of downstream conveyor after upstream equipment is ready
Pump control — water/wastewater Run-on timer to prevent short-cycling after level switch drop-out
HVAC sequencing Fan enable delay after compressor start to protect refrigerant system
Alarm and signal annunciation Flicker mode driving blinking indicator lamp or audible alarm output
Semi-automated assembly stations Interval mode creating fixed dwell time for clamping, heating, or metering cycles

Specifications That Drive the Purchase Decision

Parameter Value Notes
Brand Omron H3CR series solid-state timer family
Model H3CR-A 11-pin, DPDT relay output base variant
Form factor DIN 48 x 48 mm, plug-in Fits standard 1/16 DIN panel cut-out with adapter
Supply voltage AC100–240 V (50/60 Hz) / DC100–125 V Confirm exact variant before ordering — other voltage versions exist
Operating modes A, B, B2, C, D, E, G, J ON-delay, flicker (OFF/ON start), interval, signal ON/OFF delay, one-shot
Time ranges Multiple ranges, approx. 0.05 s to 300 h Selectable via front-panel range switch
Output type Relay output, DPDT contacts Verify contact current and voltage ratings in datasheet for your load
Connection 11-pin plug-in base Requires matching Omron 11-pin socket — not interchangeable with 8-pin sockets
Standards and approvals UL, CSA, CE (per datasheet) Supports use in regulated North American and international control panels
Indications Operation and timing LEDs, front analog dial Aids commissioning and in-service diagnostics

Full technical specifications are available on the product page at LeadTime.ca.

H3CR-A vs H3CR-A8 vs H3CR-AS: Which Variant Do You Actually Need?

Model Pin Count Output Type Contact Configuration Key Differentiator
H3CR-A 11-pin Relay DPDT Base multifunction model — widest mode coverage, most common in general panels
H3CR-A8 8-pin Relay SPDT Smaller socket footprint; choose when panel uses 8-pin sockets and SPDT is sufficient
H3CR-A8E 8-pin Relay SPDT Adds instantaneous output; choose when both timed and instantaneous contacts are needed
H3CR-AS 11-pin Transistor NPN/PNP signal-level Choose for low-level signal switching into PLC inputs — not for switching contactor coils directly
H3CR-AP 11-pin Relay DPDT Power-ON start behavior — output activates on power-up without a separate trigger signal

The pin configuration alone disqualifies substitution between the H3CR-A and the H3CR-A8 family — the sockets are physically different. If your panel already has 8-pin sockets installed, the H3CR-A will not fit without replacing the socket. Confirm what is physically in the panel before placing an order. For current stock and variant availability, check the product page at LeadTime.ca.

Expert Verdict: Is the H3CR-A Still Worth Specifying?

The H3CR-A earns its place in industrial panels because it solves a practical stocking problem: one part number, one supply voltage range covering AC100–240 V and DC100–125 V, eight selectable operating modes, and time ranges from fractions of a second to 300 hours. For maintenance teams keeping legacy equipment running, that breadth means a single spare unit can substitute for several older timers in the cabinet. For panel builders assembling general-purpose machinery, it means fewer line items on the BOM without sacrificing timing versatility. The UL, CSA, and CE approvals make it straightforward to specify in North American and international panels without chasing supplementary documentation. This is the right timer for retrofit and general-purpose relay-based timing where field replaceability and multi-mode flexibility take priority over digital precision.

Where the H3CR-A shows its age is in applications that demand clearly readable numeric setpoints or remote communication. The analog dial requires careful commissioning — small dial adjustments during startup are normal, and anyone expecting to set a time value as precisely as a digital readout will find the process fiddly. If the application involves safety-critical timing where misreading the dial position carries real consequence, a digital timer from the H3DK or H5 series is the better call. Similarly, if new panel designs are heading toward compact DIN rail density or network-connected timing, the H3CR-A is not the right platform. The H3CR-A8 is a natural step-down when only SPDT contacts are needed and space is tight, while the H3CR-AS addresses transistor output requirements for PLC-interfaced circuits.

From a procurement standpoint, the H3CR-A is a common catalog item with broad distribution across North America and globally, which keeps typical lead times short. That said, specific supply voltage variants or lower-volume configurations can occasionally require days to a few weeks if not held in regional stock. Working with a specialist automation distributor rather than a generic channel gives you access to someone who can decode legacy labels from the field, identify whether the installed socket matches the ordered unit, and propose a vetted alternative if your exact variant is on extended lead time. For pricing and current stock status, visit the H3CR-A product page at LeadTime.ca — we ship worldwide.

For volume pricing or to confirm lead time before committing to a build, contact the LeadTime.ca team directly — we ship worldwide.

What Engineers Need to Know Before Ordering the H3CR-A

Community feedback across forums including PLCTalk, PLCS.net, MrPLC, and Reddit's automation communities paints a consistent picture of the H3CR series as a dependable workhorse. Technicians with decades of panel experience regularly describe these timers as components that simply keep running in harsh environments without demanding attention. The wide supply range that covers AC100–240 V and DC100–125 V in a single variant draws consistent praise from both electricians and MRO buyers, because it means a single spare covers most panel configurations in a facility without needing to stock multiple voltage-specific units. The 48 x 48 mm plug-in format gets specific mention for making swap-outs quick in crowded panels — pull the failed unit, drop the replacement in, verify the mode settings, and the machine is back in service.

Where the community repeatedly runs into trouble is the model code. The H3CR-A versus H3CR-A8 confusion is the most commonly cited ordering mistake, with buyers discovering on arrival that the new timer will not seat in the existing socket because the pin count is different. A close second is ordering a supply voltage variant that does not match the panel — particularly when a technician reads a faded label in the field and assumes the part number is complete. Transistor-output versus relay-output mix-ups (H3CR-AS vs H3CR-A) also appear in forum threads, typically when a relay-output timer ends up wired into a signal-level circuit or vice versa. Analog dial readability draws mild but consistent criticism: users note that fine timing adjustments require patience during commissioning, and that documenting the final dial position on the panel drawing is strongly advisable for future maintenance.

Given that community-specific data for this model is drawn primarily at the H3CR family level rather than the H3CR-A individually, the most reliable pre-order protection is direct consultation with a distributor who handles Omron product regularly. Specialist distributors can cross-reference what is physically installed in the field against current catalog data, flag discontinued variant codes, and confirm socket compatibility before the order ships — reducing the risk of a costly return or an unplanned downtime extension while the correct part is sourced.

Wiring and Installation Overview

The following points summarize the key considerations for installing the H3CR-A. Always refer to the Omron H3CR-A datasheet and wiring diagram for full terminal assignments and comply with applicable local electrical codes.

  • Mount the correct 11-pin socket on DIN rail or panel surface before wiring; the H3CR-A is not compatible with 8-pin sockets used by the H3CR-A8 family.
  • Wire the supply voltage (AC100–240 V or DC100–125 V per your variant) to the designated power input terminals on the socket, and install external overcurrent protection as required by standards.
  • Wire the control trigger input to the appropriate input terminals; confirm input wiring polarity and circuit type match the mode being used (some modes use a control supply, others a voltage-free contact).
  • Connect the DPDT relay output contacts — common, NO, and NC — to the downstream device; verify the load voltage, current, and load type (resistive vs inductive) are within the contact ratings specified in the datasheet.
  • After inserting the H3CR-A into the socket, set the mode selector and time range switch before applying power; run a functional test cycle to verify timing behavior and output switching before commissioning the machine.

Wrong-Part Prevention Checklist

Before finalizing your order for the H3CR-A, work through each of these checks against your application and the installed hardware in the panel:

  1. Confirm supply voltage and type match the panel (e.g., AC100–240/DC100–125 vs low-voltage versions).
  2. Confirm pin configuration and socket match (11-pin H3CR-A vs 8-pin H3CR-A8 family).
  3. Confirm output type (relay vs transistor) and contact configuration (DPDT vs SPDT).
  4. Verify required operating modes are available in the H3CR-A (A, B, B2, C, D, E, G, J).
  5. Check time ranges cover the needed minimum and maximum delay.
  6. Confirm mounting method (DIN rail with socket, surface, or flush panel mounting) is acceptable.
  7. Verify environmental ratings (ambient temperature, pollution degree, approvals) fit the application.
  8. Ensure mechanical size (48 x 48 mm) fits existing panel cut-outs or available space.

If any item on this checklist raises a question, contact the LeadTime.ca team before ordering — confirming the correct variant takes minutes; waiting for a replacement ships takes days.

Frequently Asked Questions

What is the difference between H3CR-A and H3CR-A8, and does it matter for my existing socket?

The H3CR-A uses an 11-pin plug-in base and provides DPDT relay output contacts. The H3CR-A8 uses an 8-pin plug-in base and provides SPDT relay output. The two are physically incompatible with each other's sockets — if your panel has an 8-pin socket installed, you must order an H3CR-A8 variant, not an H3CR-A. Always check the socket style in the panel before ordering.

How do I set the H3CR-A to work as a simple ON-delay timer for a motor starter?

Select mode A (ON-delay) on the front mode selector switch. Set the time range switch to a span that covers your required delay — for example, a seconds range for a short motor start delay or a minutes range for longer sequences. Rotate the analog dial to approximately the desired value within that range, then run a test start cycle and fine-tune the dial position. Document the final mode, range, and dial setting on your panel drawing for future maintenance reference.

Can an H3CR-A replace another brand's analog timer relay as a drop-in swap?

Functionally, the H3CR-A covers most common timing modes found in competitor analog timers, but it is not a pin-for-pin drop-in replacement for non-Omron sockets. Wiring terminal assignments, socket footprints, and power input configurations differ between manufacturers. When substituting cross-brand, verify socket compatibility, terminal mapping, supply voltage, contact configuration, and agency approvals before installing. A direct like-for-like swap is only guaranteed when replacing an existing H3CR-A with another H3CR-A of the same variant.

How do I tell whether my H3CR-A has failed or whether the fault is elsewhere in the circuit?

Start by confirming supply voltage is present at the correct socket terminals and that the power LED illuminates. If the timer powers up but does not time out, verify the control input wiring matches the requirements of the selected mode and that the trigger signal is actually present. If the output contact is not switching, measure continuity across the contact terminals while the timer is in the timed-out state. Erratic timing or a timer that runs significantly fast or slow over time can indicate a component nearing end of life and warrants replacement.

Is the H3CR-A a common stock item, and what lead times should I plan for?

Standard H3CR-A variants are common catalog items with broad distribution globally, and in-stock availability is typical for the most common supply voltage configurations. Less common voltage variants or lower-volume models may require days to a few weeks for fulfillment. For current stock status and lead time before committing to a production schedule, check availability on the product page at LeadTime.ca or contact the team directly for volume requirements.

Why Order From LeadTime.ca

  • Ships worldwide — not limited to any single country or region.
  • Specialist automation distributor with experience decoding legacy Omron part numbers and confirming correct variant selection.
  • Access to volume pricing for OEMs, panel builders, and MRO programs — contact for current pricing on multi-unit orders.
  • Direct team contact for lead time confirmation before committing to a build or machine repair schedule.
  • Can identify vetted alternatives when a specific H3CR-A variant is on extended lead time, reducing downtime risk.

H3CR-A At-a-Glance Summary

  • Model: H3CR-A — 11-pin plug-in solid-state multifunction timer relay, DIN 48 x 48 mm form factor.
  • Supply voltage: AC100–240 V (50/60 Hz) / DC100–125 V on standard variant — confirm before ordering.
  • Eight selectable operating modes: A, B, B2, C, D, E, G, J — ON-delay, flicker (OFF/ON start), interval, signal ON/OFF delay, one-shot.
  • Time ranges from approximately 0.05 seconds to 300 hours, selectable via front-panel range switch.
  • DPDT relay output — not interchangeable with transistor-output H3CR-AS variant.
  • 11-pin socket required — physically incompatible with 8-pin sockets used by H3CR-A8 family.
  • UL, CSA, and CE approved — suitable for regulated North American and international control panels.
  • Common catalog availability globally; specific voltage variants may carry days-to-weeks lead time.
  • Primary ordering risk: confusing H3CR-A (11-pin DPDT) with H3CR-A8 (8-pin SPDT) or ordering an incompatible supply voltage variant.

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