PILZ PNOZ X2 774303 – Dual-Channel Safety Relay | PNOZ X Series Platform
Engineering Background
The PNOZ X series is PILZ’s foundational safety relay platform, trusted globally in machine safety applications since the 1980s. The PNOZ X2 (Part No. 774303) is the dual-channel variant engineered specifically for monitoring emergency stop pushbuttons, safety gates, and light curtain OSSD outputs in accordance with IEC 62061 and ISO 13849-1.
Product Positioning
Designed for procurement engineers specifying safety circuits up to Category 4 / PL e, the PNOZ X2 774303 delivers deterministic, fail-safe switching with a compact 22.5 mm housing footprint. It is the benchmark choice for OEM machine builders and system integrators requiring certified, field-proven safety relay performance without complex programming.
Complete Technical Specifications
| Part Number | 774303 |
| Model | PNOZ X2 |
| Manufacturer | PILZ GmbH & Co. KG |
| Supply Voltage (Us) | 24 VDC (−15% / +10%) |
| Input Channels | 2 (dual-channel, potential-free) |
| Output Contacts | 3 NO (safety) + 1 NC (auxiliary/signalling) |
| Safety Category | Category 4 per EN 954-1 / ISO 13849-1 |
| Performance Level | PL e (ISO 13849-1) |
| SIL Rating | SIL 3 (IEC 62061) |
| Response Time (de-energise) | ≤ 20 ms |
| Max. Switching Voltage | 250 VAC / 24 VDC |
| Max. Switching Current | 6 A per NO contact |
| Rated Impulse Voltage | 4 kV |
| Cross-Fault Detection | Yes (between input channels) |
| Manual / Automatic Reset | Both supported (jumper selectable) |
| Housing Width | 22.5 mm |
| Mounting | DIN rail (EN 60715) |
| Operating Temperature | −10 °C to +55 °C |
| Protection Class | IP40 (housing) / IP20 (terminals) |
| Weight | approx. 200 g |
| Certifications | CE, UL, cUL, BG, TÜV |
| Standards | EN ISO 13849-1, IEC 62061, EN 60204-1 |
Proven Application Environments
- Emergency stop (E-stop) circuit monitoring on industrial machinery and robot cells
- Safety gate / interlocking guard door monitoring
- Light curtain and safety mat OSSD output evaluation
- Two-hand control device monitoring
- Press brake and stamping machine safety circuits
- Conveyor and material handling system safety loops
- Packaging machinery and food processing equipment
- Semiconductor and electronics manufacturing automation
Engineering Advantages
- Certified to Cat. 4 / PL e / SIL 3 — highest achievable safety integrity for relay-based solutions
- Dual-channel input with cross-fault detection — detects short circuits between channels, preventing dangerous single-fault masking
- Selectable reset mode — manual reset enforces deliberate operator action; automatic reset suits guarded zones with frequent access
- 3 safety (NO) outputs — enables simultaneous control of multiple contactors or actuators in a single safety loop
- Compact 22.5 mm DIN-rail housing — minimises control cabinet footprint in space-constrained installations
- No programming required — hardwired logic ensures deterministic, auditable safety function with zero software dependency
- Wide operating temperature range — reliable in harsh industrial environments from −10 °C to +55 °C
System Architecture & Signal Flow
The PNOZ X2 774303 operates on a dual-channel, positive-guided relay architecture:
- Input evaluation — Both input channels (A1/A2 and S11/S12, S21/S22) are monitored simultaneously. The internal logic requires both channels to be closed (healthy) before enabling the output contacts.
- Cross-fault monitoring — Internal circuitry continuously checks for short circuits between the two input channels. A detected cross-fault prevents output energisation and latches the relay in the safe (de-energised) state.
- Output switching — On a valid, fault-free input signal, the 3 NO safety contacts close, enabling downstream contactors, drives, or valve actuators. The 1 NC auxiliary contact opens simultaneously, providing a feedback/signalling path to the PLC or HMI.
- Reset sequence — In manual reset mode, a momentary reset pushbutton signal (S33/S34) is required after the input channels are re-closed. This prevents automatic restart after an E-stop event, complying with EN 60204-1 §9.2.5.4.
Sourcing & Quality Verification
- All PILZ PNOZ X2 774303 units supplied by Konmask.com are sourced through authorised distribution channels or directly from verified OEM surplus inventories.
- Each unit undergoes incoming inspection: label verification (part number, date code, country of origin), housing integrity check, and functional continuity test prior to dispatch.
- Original PILZ documentation, CE Declaration of Conformity, and test certificates are available upon request for IEC/ISO compliance audits.
- Counterfeit risk mitigation: PILZ holograms, laser-etched serial numbers, and factory seal integrity are verified at goods receipt.
Procurement Process
- Confirm part number — Verify 774303 against your BOM or existing installation label before ordering.
- Request a quote — Contact support@konmask.com for volume pricing, lead time, and availability confirmation.
- Order & payment — Secure checkout via Konmask.com; T/T bank transfer and major credit cards accepted.
- Shipping — DHL / FedEx express worldwide; EXW Xiamen or CIF destination available. Typical dispatch within 1–3 business days of payment confirmation.
- Documentation — Commercial invoice, packing list, and optional Certificate of Origin (CO) provided with every shipment.
Technical FAQ
Q: Can the PNOZ X2 774303 monitor a single-channel E-stop button?
A: Yes, but doing so reduces the achievable safety category to Cat. 1 / PL c. For Cat. 4 / PL e, a dual-channel E-stop device with positive-opening contacts is required.
Q: What is the difference between PNOZ X2 (774303) and PNOZ X2P (774304)?
A: The PNOZ X2P (774304) adds a plug-in screw terminal base, simplifying replacement without rewiring. Functionally and electrically, both are identical.
Q: Is the PNOZ X2 compatible with PILZ PNOZmulti or PSS safety controllers?
A: The PNOZ X2 is a standalone hardwired relay and does not communicate with PILZ’s configurable safety systems. For integration with PNOZmulti, use the appropriate I/O expansion modules.
Q: What is the rated mechanical and electrical lifespan?
A: Mechanical operations: ≥ 10 million cycles. Electrical operations at rated load: ≥ 100,000 cycles (per IEC 60947-5-1).
Q: Can I use the NC auxiliary contact as a safety output?
A: No. The NC contact (13/14) is a signalling/feedback contact only and must not be used in the safety function path.
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