PILZ 772140 / 772142 / 772143 (PNOZ X2) Safety Relays

All three models are PILZ PNOZ X2 compact basic safety relays, belonging to PILZ classic X series. They are designed for safety circuit monitoring of industrial equipment, mainly overseeing safety components such as emergency stop buttons, safety gates, safety light curtains and two-hand control units. The three products feature identical contact configuration, functions and dimensions, differing only in supply voltage. Equipped with standard automatic reset and dual-channel safety design, they comply with machinery safety standards Cat.3 / PL d / SIL 2.

1. Erklärung des Modellcodes

1.1 General Rules for Brand & Serie

PILZ: Marke (a German professional safety automation manufacturer)

772140 / 772142 / 772143: Unique factory part numbers of PILZ

PNOSIS: Main series code for PILZ safety relays

X: X Series – Compact general-purpose safety relays, DIN rail mounted, cost-effective basic type

2: Contact configuration code – 2 sets of force-guided safety normally open (NEIN) Kontakte

1.2 Model Correspondence Table

Notiz: All three models adopt automatic reset without manual reset function. Built-in dual-channel safety detection and force-guided contacts (core safety structure of safety relays to prevent failure caused by contact welding).

2. Grundlegende technische Spezifikationen

Except for supply voltage, all electrical, mechanical and safety parameters are identical for the three models, as summarized below:

3. Full Range List (PNOZ X2 Family)

Same structure and contact configuration; differentiated only by voltage and reset mode for convenient replacement and selection:

Extended: Main Related Models of PNOZ X Series

4. Cross-Generation & Markenübergreifender Ersatz

4.1 Internal Replacement within PILZ

Produktstatus: 772140/772142/772143 (PNOZ X2) are active mass-production models, no obsolescence or direct discontinued replacements.

Upgraded Alternatives (Höhere Leistung, backward compatible):

PNOZ X2.8P: Equipped with diagnostic output and optimized terminals; pin-compatible for direct replacement.

PNOZ X3: Recommended if additional auxiliary feedback contacts are required.

Downgraded Replacement: Not available. PNOZ X2 is the entry-level model of X series.

4.2 Cross-Brand Equivalents (Same Safety Rating: Kat.3 / PL d)

Important Reminder: Always verify wiring diagrams and safety circuit logic when replacing safety components. Do not replace merely based on appearance to avoid safety hazards.

4.3 Inländische Alternativen

Empfohlene Modelle: IDEC HR1S, Tianyi safety relays

Anwendbare Szenarien: Non-high-risk equipment and ordinary domestic automated production lines

Restrictions: Not recommended for high-end export equipment, robotic systems, presses and stamping machines.

5. Anwendungsumgebungen & Branchenfälle

5.1 Hauptanwendungsszenarien

This universal safety relay is used for industrial equipment requiring safe power circuit cut-off. Typical monitored components:

1. Emergency stop circuit (full equipment emergency shutdown)
2. Mechanical safety gates and guard switches (power cut-off once gates are opened)
3. Safety light curtains and area scanners (shutdown protection when personnel enter hazardous areas)
4. Two-hand control buttons (prevent misoperation on pressing and riveting machines)
5. Safety limit switches and travel safety contacts

5.2 Anwendbare Branchen

Machine Tool Processing: Lathes, Fräsmaschinen, Bearbeitungszentren, Schleifmaschinen

Verpackung & Logistik: Verpackungsmaschinen, palletizers, Förderer, sorting equipment

Automobilbau: Schweißen, assembly and coating production lines

Rubber & Plastic Injection: Spritzgießmaschinen, Extruder, die-cutting equipment

General Automation: Robotic workstations, custom automated machinery

Maschinen für die Leichtindustrie: Drucken, textile and food processing equipment

5.3 Suitable Operating Conditions

Standard indoor control cabinets, normal temperature, dust-free or slightly dusty environments

Conventional power frequency systems (24V/110V/230V power supply)

Circuits with frequent start-stop and demand for rapid safety cut-off

5.4 Nicht empfohlene Szenarien (Vorsichtsmaßnahmen)

1. Explosion-proof Areas: No explosion-proof certification. Use dedicated PILZ explosion-proof safety relays for explosive workshops.
2. Outdoor Exposure / High Humidity & Condensation: IP40 protection is insufficient; an additional protective enclosure is required.
3. Severe Electromagnetic Interference: (Near high-frequency welders or large inverters) Shielding measures and independent earthing are necessary.
4. Overload Operation: Contact current must not exceed 6A. Add intermediate contactors for high-power loads.
5. Ambient Temperature above 55℃: Will shorten service life of safety contacts and cause false tripping.

5.5 Typische Anwendungsfälle

Fall 1: Safety Protection for Vertical Machining Center

Konfiguration: 772140 (24V AC/DC) + Safety gate switch + Not-Aus-Taste

Funktion: Opening the equipment guard gate → Safety relay actuates → Cuts off power to spindle and feed motors; Automatic reset and restart after gate closure.

Vorteile: Complies with machine safety standards and prevents personnel from entering mechanical hazardous zones.

Fall 2: Food Flow Wrapper

Konfiguration: 772143 (230V und) + Sicherheitslichtvorhang

Funktion: If operators accidentally reach into the operating area → Light curtain triggers → Relay cuts off main drive power.

Vorteile: IP40 rating adapts to slight water vapor in workshops; automatic reset ensures continuous production.

6. Leitfaden zur Modellauswahl

Quick Reference Rules

1. The three part numbers differ only in coil voltage, with identical appearance, contacts and functions:

772140 = 24V AC/DC (Universal, first choice)

772142 = 110V AC (For Japanese-style and overseas equipment)

772143 = 230V AC (For domestic 220V mains power)

2. PNOZ X2 = 2 safety NO contacts + Automatischer Reset
3. Auswahlpriorität: Confirm control cabinet supply voltage first, then verify reset mode (automatic / Handbuch).
4. Fehlerbehebung

Safety Regulation: Faulty safety relays are prohibited from disassembly and repair. The complete unit must be replaced.

8. Bestellung, Verpackung & Einhaltung

8.1 Ordering Details

8.2 Commercial & Storage Information

Mindestbestellmenge: 1 Stück

Herkunft: Deutschland (Original PILZ product)

Spare Parts Suggestion: Prepare 1 unit of corresponding voltage model for every 10 sets of similar equipment

Produktstatus: Mass production, long-term stable supply

8.3 Logistics Compliance

No lithium batteries, supercapacitors or hazardous materials inside. Classified as general low-voltage electrical component.

No special restrictions for air, sea and land transportation; no additional dangerous goods declaration required.

8.4 Standards & Zulassungen

Anwendbare Standards: IN ISO 13849-1, IEC 61508, IN 60947-5-1

Zertifizierungen: CE, TÜV, UL. Approved for use in EU, North America and most regions worldwide.

9. Supplementary: Basic Wiring Instructions
10. Coil Power Supply: Apply corresponding rated voltage to coil terminals (A1/A2).
11. Safety Input Circuit: Wire emergency stop buttons and safety gates in series to dual-channel inputs.
12. Safety Output Circuit: Connect 2 sets of NO safety contacts in series to the control circuit of main contactors.
13. Wiring Principle: Adopt series connection for safety circuits. The relay will immediately cut off outputs once any safety component opens.