Omron H3CR-F8 24-48VAC/12-48VDC Timer Relay: Technical Guide, Applications and Installation
Selecting the right component for a control panel requires more than scanning through catalogues. The Omron H3CR-F8 24-48VAC/12-48VDC is a Timer Relay thatoperates at 24-48V AC/DC and has earned its place on engineers’ shortlists for reliable timing in vibration environments applications — particularly where long service life matters more than initial price.
Omron’s strength lies in offering complete automation subsystems rather than isolated components. The Omron Sensor lineup complements the relay and switch range by providing the detection layer, so the entire signal chain — from physical event to control output — stays within one trusted supplier.
What Is the Omron H3CR-F8 24-48VAC/12-48VDC Timer Relay?
The Omron H3CR-F8 24-48VAC/12-48VDC is a Timer Relay rated at 24-48V AC/DC, built to handle reliable timing in vibration environments reliably over a long service life. Key engineering features include current-inrush free coil version, wide time range, and the unit mounts via din rail (with socket).
What separates this unit from generic alternatives is in the details: current-inrush free coil version, wide time range. Operating at 24-48V AC/DC, it integrates straightforwardly into existing control voltage buses without additional transformers or converters.
Technical Specifications
The table below summarises the main technical parameters of the Omron H3CR-F8 24-48VAC/12-48VDC. For full specifications, always refer to the official Omron product datasheet, as application-specific derating may apply.
| Parameter | Value |
|---|---|
| Product Type | Timer Relay |
| Coil / Operating Voltage | 24-48V AC/DC |
| Contacts / Channels | 1 SPDT relay output |
| Contact Current | 5 A |
| Key Features | Current-inrush free coil version, wide time range |
| Mounting | DIN rail (with socket) |
| Mechanical Lifetime | 10 million mechanical operations |
| Operating Temperature | -10°C to +55°C |
| Compatible Accessory | P3GA-11 socket |
Where Is It Used?
The Omron H3CR-F8 24-48VAC/12-48VDC Timer Relay is commonly specified for the following applications:
- Reliable timing in vibration environments
- Fluctuating supply feeds
Across these use cases, the consistent thread is a need for dependable switching over a large number of operations, often in environments where an unplanned fault would create significant disruption. The Omron H3CR-F8 24-48VAC/12-48VDC is designed with exactly those conditions in mind.
The Omron H3CR-F8 24-48VAC/12-48VDC is designed to be used with P3GA-11 socket. Using a non-compatible accessory model can compromise overall service life and performance, so always verify accessory compatibility before ordering.
Installation Notes
When mounting the Omron H3CR-F8 24-48VAC/12-48VDC Timer Relay in a panel, pay attention to three things: the socket or rail type must be the correct Omron-specified match; the terminal wiring must use appropriate cable gauge; and there must be enough vertical clearance to allow the unit to be removed for service without disturbing adjacent wiring. Getting these details right at installation saves considerable time later.
For ongoing maintenance, periodically inspect for contact discolouration, check terminal screws for loosening, and look for any signs of heat stress on the housing. Catching these early avoids the much larger cost of an unplanned production stop.
Why Choose the Omron {c}?
The case for choosing the Omron H3CR-F8 24-48VAC/12-48VDC Timer Relay is not built on marketing alone. It rests on measurable factors: documented mechanical and electrical lifespan ratings, certifications that satisfy CE and UL requirements, and a global spare parts network that means you can source a replacement quickly when a unit eventually reaches end of life.
Frequently Asked Questions
How do I install the Omron H3CR-F8 24-48VAC/12-48VDC?
Mount the Omron H3CR-F8 24-48VAC/12-48VDC Timer Relay on a 35 mm DIN rail using the compatible socket or directly as specified. De-energise the circuit before installation, connect cables at the rated cross-section, and tighten terminal screws to the torque values stated in the datasheet.
What is the electrical lifespan of the Omron H3CR-F8 24-48VAC/12-48VDC?
Electrical lifespan depends on switching frequency and load type. At rated resistive load, Omron relay products typically achieve several hundred thousand to over a million operations. The exact figure for the Omron H3CR-F8 24-48VAC/12-48VDC is stated in its technical datasheet.
Can the Omron H3CR-F8 24-48VAC/12-48VDC switch inductive loads?
Yes, but inductive loads reduce contact lifespan due to higher arc energy at switch-off. For frequent inductive switching with the Omron H3CR-F8 24-48VAC/12-48VDC Timer Relay, a suppression device — such as a varistor or RC snubber — is recommended across the load.
Is the Omron H3CR-F8 24-48VAC/12-48VDC RoHS compliant?
Omron products conform to the RoHS Directive requirements. Specific compliance documentation for the Omron H3CR-F8 24-48VAC/12-48VDC can be requested from your authorised Omron distributor.
What should I check during periodic maintenance of the Omron H3CR-F8 24-48VAC/12-48VDC?
Inspect contact surfaces for pitting or discolouration, check terminal screws for loosening (particularly in high-vibration environments), and verify that the housing shows no thermal discolouration. Replace the unit if any of these signs are present.