Pilz 751104 Sicherheitsrelais

For cross-brand replacement of model 751104, the core differences lie in system integration compatibility, diagnostic functions, wiring methods and price ranges. Siemens is ideal for full Siemens-based systems; Schneider boasts powerful diagnostic functions; Omron features the most compact size; Phoenix Contact offers high cost performance; Weidmüller provides flexible wiring; Eaton delivers superior environmental adaptability; Wieland shares identical dimensions with Pilz products.

Pilz 751104 PNOZ s4 Compact Safety Relay

1. Grundlegende Informationen & Precise Model Definition

Bestell-Nr.: 751104

Offizielles Modell: PNOZ s4 C 24VDC

Serie: PNOZsigma s Compact Safety Relay

Offizielles Handbuch: 21396-EN-21 (2026 Version)

Modellaufschlüsselung

2. Core Electrical Specifications (Official Authorized Data)

3. Full PNOZ s Series Order Number List (Mainstream-Modelle)

4. Ersatz & Compatibility List

4.1 Old & Ersatz eines neuen Modells

4.2 Competitor Equivalent Reference (Same-grade Safety Relays)

5. Anwendungsszenarien & Branchenfälle

✅ Recommended Application Scenarios

1. Emergency Stop Circuit: Connect series emergency stop buttons to cut off power of hazardous equipment instantly once triggered
2. Safety Gate Monitoring: Detect open/closed status of protective gates and halt moving machine parts when gates open
3. Photoelectric Safety Protection: Connect safety light curtains to stop equipment when personnel enter dangerous zones
4. Two-hand Control: Applied to punching & Biegemaschinen; machine starts only with simultaneous two-hand operation to avoid misoperation
5. Automated Production Line: Multi-device linkage safety control for zoned emergency stop
6. Verpackung / Printing / Injection Molding Machinery: Mold protection and safety interlock control

Typical Industry Applications

Automobilbau: Safety fence monitoring for welding robots

Electronic Assembly: Safety gate interlock for SMT production lines

Food Processing: Emergency stop circuit for filling machines complying with food machinery safety standards

Werkzeugmaschinenausrüstung: Safety guard control for CNC machine tools

❌ Not Recommended Scenarios

Direct AC220V power supply (convert to 24VDC via transformer)

Outdoor open-air, hohe Luftfeuchtigkeit (>95%RH) and heavy dust environments (only IP20 protection)

Direct switching of high-power main circuits (max 6A contact current; expand via contactors)

Explosion-proof areas (ohne explosionsgeschützte Zertifizierung)

Underwater installation or high-pressure washing environments

6. Luftfracht-Compliance & Certification Info

6.1 Air Freight Compliance Confirmation

No built-in batteries or energy storage components: Classified as ordinary industrial electrical goods, non-dangerous goods

Air freight category: General cargo, no special shipping documents or marks required

Sea & land transportation: No restrictions, shipped as standard industrial products

6.2 Main Certifications & Official Numbers

7. Fehlerbehebung & Wartungsrichtlinien

Häufige Fehler & Lösungen

Wartungsplan

Routine inspection: Check LED status and wiring tightness monthly

Periodic maintenance: Clean terminals and inspect contact wear every 6 Monate

Service life suggestion: Replace every 8~10 years (adjust according to operating frequency)

8. Selection Mnemonic

24V S4 model with 3NO+1NC spring terminals,

Dual-channel input with dual reset modes,

PL e & SIL3 high safety performance,

22.5mm slim size saves cabinet space,

Standard safety choice for industrial control!

Overview of Cross-brand Replacement for Pilz 751104 PNOZ s4 Compact Safety Relay

For cross-brand replacement of model 751104, the core differences lie in system integration compatibility, diagnostic functions, wiring methods and price ranges. Siemens fits full Siemens automation systems; Schneider has powerful diagnostics; Omron is ultra-compact; Phoenix Contact is cost-effective; Weidmüller supports diverse wiring; Eaton adapts well to harsh environments; Wieland is dimensionally identical to Pilz.

1. Core Parameter Comparison Table

2. In-depth Brand Analysis & Replacement Suggestions

2.1 Siemens 3TK2825-1BB40

Kernvorteile

Seamless connection with Siemens S7 series PLC for shared diagnostic data

Supports PROFIBUS / PROFINET communication

Built-in current monitoring for output contact fault diagnosis

Konform mit IEC 61508 SIL3 & IN ISO 13849-1 PL e

Application Tips

✅ Prioritize for full Siemens automated projects to cut integration costs

✅ Perfect for complex safety systems requiring PLC data interaction

❌ Less cost-effective in non-Siemens systems

2.2 Schneider XPSUAF13AP

Kernvorteile

Multi-level fault diagnosis with LED & text fault display

Modular design expandable up to 8 safety outputs

Built-in safety self-test function simplifies on-site commissioning

Compatible with Schneider safety bus system

Application Tips

✅ Ideal for production lines requiring detailed fault troubleshooting

✅ Best choice for multi-function integrated safety equipment

✅ Matches perfectly with Schneider Modicon PLC

2.3 Omron G9SA-321-T075

Kernvorteile

Ultra-narrow 17.5mm width saves 50% cabinet space

Low power consumption ≤80mA, suitable for battery-powered devices

Built-in surge suppression with strong anti-interference capability

Economical for mass installation

Application Tips

✅ Recommended for space-limited equipment such as small robots

✅ Suitable for large-quantity layout on assembly lines

❌ Not fit for frequent manual wiring operation due to narrow terminal spacing

2.4 Phoenix Contact PSR-SPP-24DC/ESD/3X1/1X2

Kernvorteile

Spring clamp wiring triples installation efficiency

Built-in electronic short-circuit protection extends contact service life

Hot-swap supported for easy on-site maintenance

Obvious price advantage with high cost performance

Application Tips

✅ Best choice for projects demanding fast installation & einfache Wartung

✅ Matches Phoenix distributed I/O systems perfectly

✅ Cost-saving option for mass-produced standard equipment

2.5 Weidmüller SCS 24VDC P1SIL3DS MG3

Kernvorteile

Standard IP20, partial models reach IP40 protection level

Supports 0.2~4mm² wide-range wire connection

All-round self-diagnosis for power, input and output faults

Excellent vibration resistance for rail transit & schwere Maschinen

Application Tips

✅ Preferred for dusty & vibrating harsh working conditions

✅ Suitable for applications needing large cross-section wiring

✅ Unified wiring layout matched with Weidmüller terminal blocks

2.6 Eaton MSR1270

Kernvorteile

Wide working temperature range: -25℃~+70℃ for extreme environments

10A high rated current can directly drive small motors

Multi safety logic: Not-Aus, safety gate, Zweihandsteuerung

Complete global safety certifications

Application Tips

✅ Suitable for outdoor and non-air-conditioned workshop equipment

✅ Widely used in heavy industry and new energy industries

✅ Perfect alternative for high-current safety control demands

2.7 Wieland SNO 4083-24V

Kernvorteile

Fully consistent 22.5mm dimension with Pilz PNOZ s series for direct replacement

Identical terminal layout with no cabinet modification needed

Built-in contact welding detection function

15~20% lower price than Pilz original products

Application Tips

✅ First choice for Pilz system renovation & Kostenreduzierung

✅ Ideal for retrofitting projects retaining original cabinet layout

✅ Preferred alternative in mechanical manufacturing industry

3. Key Factors for Cross-brand Selection

4. Replacement Implementation Rules & Notizen

4.1 Direct Replacement Feasibility

Physical Compatibility: All models except Omron are 22.5mm wide for direct DIN rail mounting

Electrical Compatibility: Uniform 24VDC power supply and 3NO+1NC output for direct wiring replacement

Funktionelle Kompatibilität: All support dual-channel input and dual reset modes with identical safety standards

4.2 Vorsichtsmaßnahmen beim Austausch

1. Reset Circuit: Automatic reset wiring definition varies by brand; adjust S34-S12 connection referring to official manuals
2. Diagnostic Program: Reconfigure PLC diagnosis logic to adapt to new brand fault signal definition
3. Certification Verification: Confirm alternative models meet all required project certifications (CE, UL, CSA etc.)
4. Kontaktkapazität: Ensure rated contact current meets actual load demand (minimum 6A consistent with 751104)

4.3 Optimal Selection Scheme

Neue Projekte: Select the same-brand safety relay as your automation control system for better compatibility

Renovation projects: Prioritize Wieland (dimension fully compatible) or Phoenix Contact (easy wiring)

Bulk replacement: Choose cost-effective Omron or Phoenix Contact

5. Cross-brand Selection Mnemonic

Siemens excels in system integration,

Schneider leads in diagnosis function,

Omron owns the slimmest dimension,

Phoenix wins high cost attribution,

Weidmüller adapts tough condition,

Eaton fits wide temperature application,

Wieland replaces Pilz without variation,

Matching selection brings best operation!