OMRON H3CT-8H Solid State Timer Relay | Replacement, Equivalent & Selection Guide
The OMRON H3CT-8H is a compact, multi-range solid state timer relay designed for DIN rail or panel mounting. Widely used in industrial automation, machine control, and process timing applications, it offers reliable on-delay timing with a broad time range selection and universal supply voltage compatibility. This page provides full technical specifications, compatible replacement models, and a structured selection guide to help engineers and procurement teams make the right choice.
Technical Specifications
- Model: H3CT-8H
- Brand: OMRON
- Series: H3CT
- Type: Solid State Multi-Range Timer Relay
- Timing Mode: On-delay (power-on delay)
- Time Ranges: 0.05 s – 300 h (multi-range selectable)
- Supply Voltage: 100–240 VAC / 100–125 VDC (universal)
- Output: SPDT (1c contact), 5 A resistive load
- Pin Configuration: 8-pin (octal base)
- Mounting: DIN rail (with socket) or panel mount
- Reset Method: Power interruption
- Repeat Accuracy: ±0.5% or less
- Operating Temperature: -10°C to +55°C
- Storage Temperature: -25°C to +65°C
- Dielectric Strength: 2,000 VAC (between contacts and coil)
- Insulation Resistance: 100 MΩ min. (at 500 VDC)
- Degree of Protection: IP40 (front panel)
- Approvals: UL, CSA, CE, TÜV
- Dimensions (W×H×D): 48 × 48 × 86 mm (approx.)
- Weight: Approx. 200 g
Compatible Replacement & Equivalent Models
The following models are functionally compatible or direct replacements for the OMRON H3CT-8H. Always verify supply voltage, time range, and contact rating before substitution.
- OMRON H3CR-A8 – Multi-function timer, 8-pin, 100–240 VAC/DC; broader function set, direct socket-compatible upgrade
- OMRON H3CT-8 – Standard version without the extended high-range option; same footprint and socket
- Schneider Electric RE22R1MMR – 8-pin on-delay timer, 24–240 VAC/DC; equivalent contact rating
- Siemens 3RP2025-1BB30 – DIN rail timer relay, on-delay, 24–240 VAC/DC, 8-pin socket compatible
- ABB CT-MFD.22S – Multi-function timer, 8-pin, 24–240 VAC/DC; suitable cross-brand replacement
- Autonics AT8N – 8-pin analog timer, on-delay, 100–240 VAC; cost-effective alternative
- Panasonic TB4 Series – 8-pin DIN rail timer; compatible socket and similar time ranges
Note: Cross-brand replacements may require socket adapter verification. Contact [email protected] for compatibility confirmation.
Why Choose the Original OMRON H3CT-8H
- Proven reliability: OMRON’s H3CT series has decades of field-proven performance in demanding industrial environments.
- Wide time range: Single unit covers 0.05 s to 300 h — eliminates the need for multiple SKUs in your BOM.
- Universal voltage: 100–240 VAC/DC input simplifies global deployment and reduces spare-part inventory.
- High repeat accuracy: ±0.5% ensures process consistency in precision timing applications.
- Global certifications: UL, CSA, CE, TÜV — accepted by international machine safety standards.
- Extensive ecosystem: Compatible with OMRON P2CF-08 and P3G-08 sockets for tool-free replacement.
Typical Applications
- Motor start/stop sequencing in conveyor and pump systems
- HVAC compressor delay-on start protection
- Lighting control and energy management panels
- Injection molding machine cycle timing
- Elevator and escalator door control logic
- Water treatment and chemical dosing systems
- Welding machine duty-cycle control
- PLC auxiliary timing circuits (backup or standalone)
System Compatibility
- Sockets: OMRON P2CF-08, P3G-08 (8-pin octal); third-party equivalents with 8-pin octal layout
- DIN Rail: Standard 35 mm DIN rail (EN 60715)
- PLC Integration: Compatible as auxiliary timer with Siemens S7, Mitsubishi MELSEC, OMRON CJ/CS/NX series, Allen-Bradley MicroLogix
- Panel Builders: Suitable for Rittal, Schneider PrismaSeT, and ABB ArTu enclosures
- Wiring Standards: IEC 60947-5-1 compliant
Selection Guide
Use the criteria below to confirm the H3CT-8H is the right model, or to identify the best alternative:
- Timing function needed? On-delay only → H3CT-8H ✓ | Multi-function → consider H3CR-A8
- Supply voltage? 100–240 VAC/DC → H3CT-8H ✓ | 24 VDC only → consider H3CT-8 (24 VDC variant) or Siemens 3RP2025
- Time range required? Up to 300 h → H3CT-8H ✓ | Up to 30 min only → H3CT-8 standard range sufficient
- Contact load? ≤5 A resistive → H3CT-8H ✓ | Higher load → add external relay or contactor
- Budget-sensitive project? Consider Autonics AT8N or Panasonic TB4 as cost-optimized alternatives
- Existing socket installed? P2CF-08 or P3G-08 → direct drop-in replacement ✓
Quality Assurance & Sourcing
- Source: Authorized distributor channels and verified surplus stock
- Inspection: Each unit inspected for label authenticity, date code, and packaging integrity
- Traceability: Batch records available on request for MRO and OEM procurement
- Warranty: 12-month warranty against manufacturing defects
- Counterfeit prevention: All OMRON products sourced with verifiable supply chain documentation
How to Order
- SKU: H3CT-8H
- Add to cart directly on this page, or contact us for bulk/OEM pricing
- Lead time: In-stock items ship within 1–3 business days; special orders 7–15 business days
- Payment: T/T, PayPal, credit card, and trade account available
- Export: Worldwide shipping with DHL, FedEx, UPS; export documentation provided
- Contact: [email protected] | +0086 19859288691
Replacement & Compatibility FAQ
Q: Can I replace H3CT-8H with H3CR-A8 directly?
A: Yes, the H3CR-A8 uses the same 8-pin octal socket (P2CF-08/P3G-08) and is a functional superset. Set it to on-delay mode to replicate H3CT-8H behavior.
Q: Is the H3CT-8H compatible with 24 VDC systems?
A: The H3CT-8H supports 100–125 VDC but not 24 VDC. For 24 VDC systems, specify the H3CT-8 (24 VDC variant) or a Siemens/Schneider equivalent.
Q: What socket does the H3CT-8H require?
A: OMRON P2CF-08 (surface mount) or P3G-08 (DIN rail). Both are 8-pin octal sockets sold separately.
Q: Can I use a third-party socket?
A: Yes, any 8-pin octal socket conforming to IEC 60947-5-1 pin layout is compatible. Verify current rating ≥5 A.
Q: How do I set the time range on the H3CT-8H?
A: Use the front-panel rotary switch to select the time range, then adjust the potentiometer dial to the desired set point within that range.
Q: Do you provide certificates of conformity?
A: Yes, CoC and test reports are available upon request for OEM and MRO procurement.
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