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
ParameterTypical rangeNotes & selection driver
Reset TypeManual, automatic, monitored manual
Max Current6A AC-15, 10A DC-13
Response Time<20ms
Voltage Rating24V DC, 110V AC, 230V AC
Safety CategoryCategory 3, PL d (EN ISO 13849-1)
Protection ClassIP20
Contact Configuration2NO/2NC safety contacts
Operating Temperature-25°C to +55°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards
ISO 13849-1, IEC 60204-1, IEC 61508, EN 62061

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

Typical Suppliers & Equivalents

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)

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Reset Circuit

Manufacturer profiles associated with Reset Circuit.

Sourcing Reset Circuit from China?
Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.
Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Related Components

Contact Plate
A conductive plate in motor terminal blocks that establishes electrical contact between conductors.
Marking Strip
A durable marking strip used for terminal identification in motor terminal blocks to ensure proper electrical connections and safety compliance.
Gland Body
A gland body is the main housing component of an aluminum cable gland that provides mechanical protection and environmental sealing for electrical cables entering enclosures.
Current Sense Resistor
A precision resistor used to measure current flow in electrical circuits by converting current to a measurable voltage drop.

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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Request Manufacturing Insight for Reset Circuit

Thank you. Your request has been sent. We'll respond within 1–3 business days.
Sorry, we couldn't send your message. Please try again, or email us at contact@cnfx.com.
Reference Voltage Circuit Resistive Heating Wire
Get QuotesChat