Omron H3CR-A8 Multi-functional Solid-State Timer

The Omron H3CR-A8 is a 1/16 DIN size (48×48mm) 8-pin plug-in multi-functional solid-state timer featuring a wide voltage range, multiple operating modes and reliable double-contact output. It is widely used in the field of industrial automation control.

1. Core Parameters and Specifications

1. Functional Features
2. Multi-functionality: 5 operating modes can be easily switched via the mode selector switch to meet diverse control requirements
3. Wide Voltage Design: Universal AC/DC power supply reduces inventory types and adapts to global voltage standards
4. High-Precision Timing: Solid-state circuit design delivers stable timing accuracy, superior to mechanical timers
5. Double-contact Output: DPDT 5A contacts enable simultaneous control of two independent circuits
6. Power Reset Function: Minimum power-off reset time of 0.1s ensures reliable restart
7. International Certifications: Compliant with EN61812-1 and EN60664-1 standards, certified by UL and CSA

III. Wiring and Operation

1. Terminal Configuration (8-pin)

1,3,4,8: Empty pins

2: Power supply (+)

5: Power supply (-) / AC neutral

6: Normally Closed (NC) contact

7: Common (COM) terminal

10: Normally Open (NO) contact

2. Operation Panel

Power indicator: Displays power on/off status

Output indicator: Displays contact operation status

Time unit selector: Switches between seconds/minutes/hours

Time setting knob: Precisely sets the time delay

Operating mode selector switch: Switches between 5 operating modes

1. Application Scenarios
2. Sequential control and time-delay start of industrial machinery
3. Time delay for motor overload protection
4. Cycle setting for temperature control of heating equipment
5. Intermittent operation control of production lines
6. Time-delay triggering of alarm systems
7. Timing control of lighting systems
8. Related Models and Differences

1. Usage Precautions
2. Environmental Requirements: Avoid use in environments with drastic temperature changes, high humidity, strong vibration or corrosive gas
3. Anti-interference Measures: In noisy environments, it is recommended to replace input signal lines with shielded cables
4. Wiring Specifications: Strictly follow terminal polarity for wiring to avoid short circuits
5. Mode Switching: Switching time units or operating modes under power is prohibited, which may cause malfunctions
6. Power Reset: Ensure a power-off time of ≥0.1s to guarantee reliable reset

VII. Substitution and Upgrading

Direct Substitute Model: H3CR-A8-301 (fully functionally compatible)

Upgraded Models: H3CR-A8S (with added instantaneous contacts), H3CR-AS (transistor output), H5CN series (digital display type)

Cross-Brand Interchangeable Model Guide for Omron H3CR-A8

The Omron H3CR-A8 is a 1/16 DIN (48×48mm) 8-pin plug-in multi-functional solid-state timer with core parameters: 5 operating modes (ON delay/Flicker OFF Start/Flicker ON Start/Interval/One-shot delay), DPDT double pole double throw time-delay contact output, 0.05s～300h time range, and wide voltage input (AC100～240V/DC100～125V or AC24～48V/DC12～48V). The following are interchangeable models from mainstream brands, sorted by matching degree:

1. Omron Internal Substitute Models (Best Match)

1. Cross-Brand Interchangeable Models from Mainstream Brands
2. Schneider Electric

2. Eaton Moeller

3. IDEC

4. Carlo Gavazzi

5. Crouzet

III. Key Matching Points for Interchange (Mandatory Check)

1. Interchange Operation Steps and Precautions
2. Power-Off Safety Operation: Disconnect and lock the power supply before replacement to prevent electric shock and equipment damage
3. Parameter Recording: Record the time setting, operating mode and wiring method of the original H3CR-A8
4. Model Verification: Confirm that the key parameters of the substitute model are consistent with the original one
5. Pin Confirmation: Check the terminal diagram of the substitute model to ensure correct wiring (H3CR-A8 terminals: 2=+, 5=-/AC neutral, 6=NC, 7=COM, 10=NO)
6. Mode Setting: Adjust the mode selector switch of the substitute model according to the original operating mode
7. Time Calibration: Set the same time delay as the original model to ensure consistent control logic
8. Test and Verification: Conduct a power-on test to confirm normal timer operation and equipment operation in line with expectations
9. Recommended Models for Special Scenarios

1. Scenarios Not Recommended for Interchange
2. The original equipment has special certification requirements (e.g., classification society certification) and the substitute model has no corresponding certification
3. Complex control logic relying on unique functions of H3CR-A8 (e.g., 0.1s power reset time)
4. Large differences in pin definition between the substitute model and the original one, with no possibility of rewiring
5. Extremely high time accuracy requirements (±0.2% FS), and some economical substitute models have lower accuracy