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.

Model Code Explanation

1.1 General Rules for Brand & Series

PILZ: Brand (a German professional safety automation manufacturer)

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

PNOZ: 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 (NO) contacts

1.2 Model Correspondence Table

Factory Part No.	Full Model	Supply Voltage	Key Difference
772140	PNOZ X2 24V AC/DC	24V AC/DC	Most widely used in industrial control, compatible with DC systems for PLCs and sensors
772142	PNOZ X2 110V AC	110V AC	Suited for Japanese-style equipment and power supply systems in some overseas regions
772143	PNOZ X2 230V AC	230V AC	Matches domestic industrial mains power and European standard AC systems

Note: 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).

Core Technical Specifications

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

Category	Item	Specifications	Remarks
Basic Properties	Product Type	Dual-channel Safety Relay	Dual-channel monitoring for safety circuits, compliant with machinery safety regulations
	Safety Contacts	2 × Force-guided Normally Open (NO) Contacts	No auxiliary contacts, pure safety output
	Reset Mode	Automatic Reset	Automatically restarts after safety circuit recovers, no manual button required
	Mounting	Standard 35mm DIN Rail Mount	Universal installation for control cabinets
	Ingress Protection	IP40	For indoor cabinet use; dust-proof, not resistant to water splashing
Electrical Parameters	Rated Operating Voltage	772140: 24V AC/DC	Coil supply voltage
		772142: 110V AC
		772143: 230V AC
	Rated Contact Load AC-15	230V / 6A	Applicable to resistive and inductive loads
	Rated Contact Load DC-13	24V / 6A	Load capacity for DC circuits
	Max. Switching Voltage	250V AC / 30V DC	Upper voltage limit for output circuits
	Typical Response Time	＜20 ms	Fast safety actuation to ensure reliable emergency stop
	Power Consumption	Approx. 2.5W	Low power loss, low heat generation during long-term operation
Environmental Parameters	Operating Temperature	0℃ ~ +55℃	Standard industrial control environment
	Storage Temperature	-25℃ ~ +70℃	Temperature range for storage and transportation
	Relative Humidity	10% ~ 90% (Non-condensing)	Condensation and frost are prohibited
Safety Ratings	Machinery Safety Category	Cat. 3	Compliant with EN ISO 13849-1
	Performance Level	PL d	Standard safety level for mainstream automated equipment
	Safety Integrity Level	SIL 2	Compliant with IEC 61508 functional safety standard
Certifications	Approvals	TÜV, CE, cULus	Globally recognized industrial certifications, eligible for export
Physical & Wiring	Dimensions (W × H × D)	22.5 × 94 × 120 mm	Narrow compact design, saves cabinet space
	Connection Type	Screw Terminals	Reliable wiring, suitable for environments with mechanical vibration
	Weight	Approx. 140 g	Lightweight rail-mounted module

Full Range List (PNOZ X2 Family)

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

Part No.	Full Model	Supply Voltage	Reset Mode	Description
772140	PNOZ X2 24V AC/DC	24V AC/DC	Automatic Reset	Mainstream standard model
772141	PNOZ X2 48V AC	48V AC	Automatic Reset	Special low-volume voltage version
772142	PNOZ X2 110V AC	110V AC	Automatic Reset	For 110V AC power systems
772143	PNOZ X2 230V AC	230V AC	Automatic Reset	For 220/230V mains systems
772100	PNOZ X2 24V AC/DC	24V AC/DC	Manual Reset	Requires external reset button for high-safety applications

Extended: Main Related Models of PNOZ X Series

Model	Contact Configuration	Application Position
PNOZ X1	1 Safety Normally Open Contact	Basic single safety circuit monitoring
PNOZ X3	3 Safety Normally Open + 1 Auxiliary Normally Closed Contact	Multiple output circuits with signal feedback
PNOZ X4	4 Safety Normally Open Contacts	Synchronous cut-off for multiple loads

Cross-Generation & Cross-Brand Replacement

4.1 Internal Replacement within PILZ

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

Upgraded Alternatives (Higher performance, 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: Cat.3 / PL d)

Brand	Model	Supply Voltage	Contact Configuration	Compatibility Note
Schmersal	SRB 301ST	24V/110V/230V	2 NO Safety Contacts	Identical function and rating, similar wiring logic
SIEMENS	3TK2821	24V AC/DC / 230V AC	2 NO Safety Contacts	Popular German alternative, universal DIN rail mounting
Schneider Electric	XPSAC01	24V/230V	2 NO Safety Contacts	Preferred for cabinets with Schneider components
ABB	JSBR4	24V/230V	2 NO Safety Contacts	Widely used for European and American projects
Weidmüller	SAFE-SR2	24V AC/DC	2 NO Contacts	Cost-effective option for domestic control cabinets

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 Domestic Alternatives

Recommended Models: IDEC HR1S, Tianyi safety relays

Applicable Scenarios: Non-high-risk equipment and ordinary domestic automated production lines

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

Application Environments & Industry Cases

5.1 Main Application Scenarios

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

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

5.2 Applicable Industries

Machine Tool Processing: Lathes, milling machines, machining centers, grinders

Packaging & Logistics: Packaging machines, palletizers, conveyors, sorting equipment

Automotive Manufacturing: Welding, assembly and coating production lines

Rubber & Plastic Injection: Injection molding machines, extruders, die-cutting equipment

General Automation: Robotic workstations, custom automated machinery

Light Industry Machinery: Printing, 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 Not Recommended Scenarios (Precautions)

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

5.5 Typical Application Cases

Case 1: Safety Protection for Vertical Machining Center

Configuration: 772140 (24V AC/DC) + Safety gate switch + Emergency stop button

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

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

Case 2: Food Flow Wrapper

Configuration: 772143 (230V AC) + Safety light curtain

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

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

Model Selection Guide

Quick Reference Rules

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)

PNOZ X2 = 2 safety NO contacts + Automatic reset
Selection Priority: Confirm control cabinet supply voltage first, then verify reset mode (automatic / manual).
Troubleshooting

Fault Phenomenon	Probable Cause	Solution
Power indicator off, no response	Broken coil wiring, loose terminals, power failure	Measure input voltage, tighten screws, check upstream circuit breakers and fuses
Frequent false tripping	Loose wiring in safety circuit, electromagnetic interference, poor contact of gate switches	Re-crimp terminals, route cables away from power lines, replace worn safety switches
Safety circuit normal but relay fails to energize	Aged internal contacts, damaged coil, end of service life	Replace with an identical safety relay (Safety components are not repairable)
Output contacts cannot open (welded)	Long-term overload, load short circuit, frequent high-current surges	Replace the relay; add intermediate contactors for current division; never exceed 6A rated current
Abnormal reset, failed automatic restart	Incomplete closure of safety circuit, line short to ground	Check continuity of the entire safety circuit and eliminate short circuits

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

Ordering, Packaging & Compliance

8.1 Ordering Details

Factory Part No.	Full Model	Supply Voltage	Standard Packaging
772140	PNOZ X2 24V AC/DC	24V AC/DC	1 unit per box
772142	PNOZ X2 110V AC	110V AC	1 unit per box
772143	PNOZ X2 230V AC	230V AC	1 unit per box

8.2 Commercial & Storage Information

Minimum Order Quantity: 1 piece

Origin: Germany (Original PILZ product)

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

Product Status: 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 & Approvals

Applicable Standards: EN ISO 13849-1, IEC 61508, EN 60947-5-1

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

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