INDUSTRY COMPONENT

Reset Circuit

Safety relay reset circuit for restoring machine operation after safety device activation

Component Specifications

Definition
A specialized electrical circuit within a safety relay that enables controlled resetting of safety functions after a safety device (e.g., emergency stop, light curtain, safety gate) has been triggered and the fault condition has been cleared. It ensures the machine cannot restart automatically and requires manual intervention to verify safe conditions before resuming operation.
Working Principle
The reset circuit monitors safety input devices and maintains a safety output in a de-energized state when any safety device is triggered. After all safety conditions are restored, the circuit requires a deliberate reset action (typically via a pushbutton or switch) to re-energize the safety output, allowing machine operation to resume. This prevents automatic restarting and ensures operator verification of safe conditions.
Materials
Copper conductors (typically 0.5-2.5mm²), insulating materials (PVC, polyamide), contact materials (silver alloy, gold-plated for low current), housing materials (thermoplastic, polycarbonate)
Technical Parameters
  • Reset Type Manual, automatic, monitored manual
  • Max Current 6A AC-15, 10A DC-13
  • Response Time <20ms
  • Voltage Rating 24V DC, 110V AC, 230V AC
  • Safety Category Category 3, PL d (EN ISO 13849-1)
  • Protection Class IP20
  • Contact Configuration 2NO/2NC safety contacts
  • Operating Temperature -25°C to +55°C
Standards
ISO 13849-1, IEC 60204-1, IEC 61508, EN 62061

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Reset Circuit.

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Unintended machine restart
  • Reset circuit failure leading to downtime
  • Incorrect reset procedure causing safety hazards
  • Electrical faults in reset circuitry
FMEA Triads
Trigger: Worn reset button contacts
Failure: Intermittent reset function, failure to reset safety relay
Mitigation: Regular maintenance inspection, use of high-quality contact materials, implementing redundant contact design
Trigger: Moisture ingress in reset circuit
Failure: Short circuits, corrosion of components, unreliable operation
Mitigation: Proper IP rating selection, regular environmental checks, use of conformal coating on PCBs
Trigger: Incorrect wiring of reset circuit
Failure: Safety system malfunction, potential for unsafe machine operation
Mitigation: Clear wiring diagrams, color-coded connections, mandatory electrical safety training for installers

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Contact bounce <3ms, insulation resistance >100MΩ at 500V DC, dielectric strength 2.5kV AC for 1 minute
Test Method
Functional safety testing per IEC 61508, diagnostic coverage analysis, fault injection testing, endurance testing (minimum 1 million operations)

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Frequently Asked Questions

What is the difference between manual and automatic reset in safety relays?

Manual reset requires physical operator intervention (pushing a button) after fault clearance, ensuring verification of safe conditions. Automatic reset occurs automatically when fault conditions are cleared, which is generally prohibited for safety functions as it could lead to unexpected restarts.

Why do safety relays require monitored reset circuits?

Monitored reset circuits ensure the reset signal is only accepted when all safety conditions are met and the reset device is properly functioning. This prevents accidental or unauthorized resetting and provides additional safety assurance.

Can reset circuits be bypassed for maintenance purposes?

No, bypassing safety reset circuits is strictly prohibited as it compromises machine safety. Maintenance modes should use properly designed control systems with appropriate safety measures rather than circuit bypassing.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Reset Button/Input Resistance Heating Coil