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The Omron H3CR-A8 is an 8-pin multi-function solid-state timer relay belonging to the H3CR-A series. It features a 1/16 DIN standard size (48×48 mm), wide voltage range, multiple operating modes, and high timing accuracy, suitable for various industrial automation control applications.
- Core Specifications
| Item | Details |
| Product Type | Solid‑state multi‑function timer relay, 8‑pin plug‑in type |
| Power Supply | – Standard: AC100–240V / DC100–125V |
| – Low voltage: AC24–48V / DC12–48V | |
| – Voltage tolerance: 85%–110% of rated voltage | |
| Timing Range | 0.05 seconds to 300 hours, with 18 selectable ranges |
| Operating Modes | 5 modes: |
| 1. ON Delay | |
| 2. Flicker‑Off Start | |
| 3. Flicker‑On Start | |
| 4. Interval | |
| 5. One‑Shot Delay | |
| Output | Timed DPDT relay contacts, rated current 5 A |
| Timing Accuracy | ±0.2% FS (full scale), setting error ±5% FS ±50 ms |
| Dimensions | 1/16 DIN standard (48×48 mm), plug‑in mounting |
| Approvals | UL, CSA, CE, CCC certified |
- Key Features & Advantages
- Wide voltage compatibility: Supports AC/DC universal power supply, reducing inventory part numbers.
- Flexible multi-mode operation: 5 operating modes cover diverse control requirements without device replacement.
- Extended timing range: 0.05 s to 300 h, satisfying both millisecond-level and long-duration control.
- High precision timing: Solid-state circuit design ensures stable accuracy, superior to conventional mechanical timers.
- Eco-friendly & energy saving: Low power consumption design meets modern industrial energy standards.
- Expandable functions: Supports setting ring (sold separately) to lock time settings and prevent misoperation; optional faceplate available for different design needs.
- Wiring & Installation Notes
- Pin configuration: 8-pin design, requires dedicated socket (e.g., P2CF-08-E).
- Wiring precautions:
Polarity must be observed for DC power terminals.
Input terminals (6-7): ON impedance ≤ 1 kΩ, OFF impedance ≥ 100 kΩ.
Output contacts rated at 5 A; do not overload.
- Mounting: Standard DIN rail or panel flush mounting; allow space for heat dissipation.
- Typical Applications
Motor starting control (star-delta conversion delay)
Sequential equipment control (delayed switching of multiple processes)
Intermittent operation control (periodic start/stop)
Safety protection delay (overload protection, fault delay alarm)
Automated production line process control
Timing control for lighting and HVAC systems
- Model Variations & Replacements
- Same-series models:
H3CR-A8: Standard 8-pin type
H3CR-A8S: With instantaneous contact output
H3CR-A: 11-pin type (8 operating modes)
- Replacement options:
Omron upgraded alternatives: H3CR-F8 / H3CR-G8 (enhanced functions)
Other brands: Schneider RE22 series, Siemens 3RP series timer relays
- Usage Precautions
- Supply voltage must remain within rated range; excessive fluctuation may affect accuracy.
- Do not directly drive high-current loads with output contacts; use a contactor for switching.
- Confirm the selected time range before setting to avoid incorrect configuration.
- Ambient operating temperature: -10°C to +55°C; avoid moisture, dust, and corrosive environments.
- Regularly inspect terminal connections to prevent poor contact due to loosening.
Complete Omron H3CR Series Timer Relays & Cross-Reference Models
- H3CR Series Overview
The Omron H3CR series is a family of 1/16 DIN (48×48 mm) solid-state timer relays, including multi-function, dual-function, star-delta, and off-delay types. It is available in 8-pin and 11-pin versions with wide AC/DC voltage ranges and timing accuracy up to ±0.2% FS.
- Full Series Model Classification
2.1 Multi-Function Timers-H3CR-A Series
| Model | Pins | Operating Modes | Power Supply | Key Features |
| H3CR‑A | 11 | 8 | AC100–240V / DC100–125V | Basic type, instantaneous output |
| AC24–48V / DC12–48V | ||||
| H3CR‑AS | 11 | 8 | Same as above | With signal input |
| H3CR‑AP | 11 | 8 | Same as above | With PNP input |
| H3CR‑A8 | 8 | 5 | Same as above | Compact, 8‑pin |
| H3CR‑A8E | 8 | 5 | AC24–48V / DC12–48V | Economic, low power |
| H3CR‑A8J | 8 | 5 | AC24–240V | Wide voltage compatible |
| H3CR‑AS8 | 8 | 5 | Same as above | 8‑pin with signal input |
| H3CR‑AP8 | 8 | 5 | Same as above | 8‑pin with PNP input |
Timing range: 0.05 s to 300 h, 18 selectable ranges
Output: Timed DPDT relay contacts, 5 A rated current
2.2 Dual-Function / Star-Delta Timers-H3CR-F Series
Key feature: Independent setting of run/pause time, allowing combination of short and long durations.
2.3 Off-Delay Timers-H3CR-H Series
| Model | Pins | Function | Timing Range | Power Supply |
| H3CR‑H | 11 | Off‑delay | S: 0.05–12 s | AC100–240V |
| M: 0.05–12 min | AC/DC24V | |||
| H3CR‑H8 | 8 | Off‑delay | Same as above | Same as above |
| H3CR‑HRL | 11 | Off‑delay + Manual Reset | Same as above | Same as above |
| H3CR‑H8RL | 8 | Off‑delay + Manual Reset | Same as above | Same as above |
| H3CR‑H8S | 8 | Off‑delay (short time) | 0.05–12 s | Same as above |
| H3CR‑H8M | 8 | Off‑delay (long time) | 0.05–12 min | Same as above |
Key feature: Operates with delay after power interruption, ideal for safe equipment shutdown.
2.4 Special-Function Timers-H3CR-G Series
| Model | Pins | Function | Power Supply | Features |
| H3CR‑G | 11 | Multi‑function combination | AC100–240V | Integrated multiple delay functions |
| H3CR‑G8 | 8 | Multi‑function combination | Same as above | Compact 8‑pin version |
- Cross-Reference Models from Other Brands
3.1 International Brand Replacements
| Original | Schneider Alternative | Siemens Alternative | ABB Alternative | Omron Upgraded Alternative |
| H3CR‑A8 | RE22R2MMR (Multi‑function) | 3RP1505‑1BB30 | CT‑ERC.12 | H3CR‑F8 (Dual‑function) |
| RE22R1MMR (Single‑function) | 3RP2505‑1BB30 | CT‑ERS.12 | H3CR‑G8 (Enhanced) | |
| H3CR‑A | RE22R2KMK | 3RP1555‑1AW30 | CT‑ERC.22 | H3CR‑AS (With signal input) |
| RE22R1KMK | 3RP2555‑1AW30 | CT‑ERS.22 | ||
| H3CR‑F | RE22R2PMR (Dual timer) | 3RP1576‑1BW30 (Star‑delta) | CT‑ETC.11 | H3CR‑FL (Star‑delta dedicated) |
| H3CR‑H | RE22R1DR (Off‑delay) | 3RP1586‑1BW30 | CT‑ERP.11 | H3CR‑HRL (With manual reset) |
Replacement notes:
Schneider RE22 series: Wide voltage (24-240V AC/DC), NFC configuration, ±0.5% accuracy.
Siemens 3RP series: Modular design, LED indication, 10 timing ranges, IP40 protection.
ABB CT series: Economic, 3 basic models cover full functions, 0.05 s-300 h range.
3.2 Chinese Domestic Brand Replacements
| Original | Chint Alternative | Delixi Alternative | Tianshui 213 Alternative |
| H3CR‑A8 | JSZ3A‑B (Multi‑function) | JSZ3F | JS14S‑8 |
| H3CR‑H | JSZ3C‑A (Off‑delay) | JSZ3D | JS14P |
Advantages: Priced at approximately 1/3 to 1/2 of imported brands, compatible with domestic power grids, with local technical support.
- Key Matching Parameters for Replacement
| Parameter | Matching Requirement | Priority |
| Pin count | 8‑pin ↔ 8‑pin, 11‑pin ↔ 11‑pin | ★★★★★ |
| Power supply | Identical AC/DC type and voltage range | ★★★★☆ |
| Operating mode | Match multi‑function / off‑delay / dual‑function type | ★★★★☆ |
| Timing range | Covers required time range | ★★★☆☆ |
| Output type | DPDT/SPDT contact, rated current ≥ 5 A | ★★★★☆ |
| Mounting size | 1/16 DIN (48×48 mm) standard | ★★★☆☆ |
- Usage & Replacement Guidelines
- Functional matching: Select equivalent function type to avoid logic errors due to missing features.
- Wiring compatibility: Pin definitions may vary by brand; always verify wiring diagrams before replacement.
- Time calibration: Re-adjust timing settings after replacement to ensure accuracy.
- Environmental suitability: For industrial use, select devices with protection rating ≥ IP20.
- Certification compliance: For export equipment, ensure replacements carry UL, CE, CCC or equivalent certifications.
