Pilz PNOZ X Series Safety Relays: PNOZ X2 774303

Technical Dossier

Product Details And Specifications

Pilz PNOZ X Series: Comprehensive Module Range and Technical Overview

The Pilz PNOZ X series represents one of the most widely deployed safety relay families in global heavy industry. Installed across chemical processing plants, nuclear power facilities, oil refineries, and offshore platforms, PNOZ X modules serve as the foundational safety switching layer for emergency stop circuits, safety gate monitoring, two-hand control, and light curtain interfaces. Their DIN rail-mounted, hardwired architecture complies with EN ISO 13849-1 (up to PLe/Cat.4) and IEC 62061 (up to SIL 3), making them the reference standard for functional safety in machinery and process automation. The series has accumulated decades of field validation across installations in Europe, North America, and Asia-Pacific, with a global installed base that sustains continuous demand for both active and discontinued part numbers.

The Evolution of PNOZ X Architecture

The PNOZ X series was introduced by Pilz GmbH & Co. KG in the 1980s as a discrete, relay-based safety switching device. Early variants — including the original PNOZ 1 and PNOZ 2 — established the dual-channel, force-guided contact architecture that became the industry template. Through the 1990s, Pilz expanded the range to address specific application categories: PNOZ X1 for E-stop monitoring, PNOZ X2 for two-channel E-stop and safety gate applications, PNOZ X3 for three-phase motor monitoring, and PNOZ X4/X5 for two-hand control circuits.

In the 2000s, Pilz introduced the PNOZmulti configurable safety controller family as a programmable successor, and later the PNOZmulti 2 (m B0, m B1, m EF) platform. However, the hardwired PNOZ X series remained in production and active specification due to its simplicity, SIL 3 certification without programming overhead, and direct drop-in replaceability. Many PNOZ X variants entered the mature/end-of-life phase post-2015, with Pilz recommending PNOZmulti 2 equivalents as modern replacements. This transition creates sustained aftermarket demand for original PNOZ X hardware to maintain installed base continuity without full system redesign.

PNOZ X Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced models within the PNOZ X series. Each entry reflects the module's primary functional classification.

Emergency Stop / Safety Gate Monitoring

• PNOZ X1 774300: Single-channel E-stop monitor, 24 VDC, 3 N/O + 1 N/C contacts.
• PNOZ X1P 774310: E-stop monitor with plug-in terminal base, 24 VDC.
• PNOZ X2 774303: Dual-channel E-stop/safety gate relay, 24 VDC/VAC, 3 N/O + 1 N/C, PLe/Cat.4.
• PNOZ X2.1 774306: Dual-channel E-stop relay, 24 VDC, expanded output configuration.
• PNOZ X2P 774312: Dual-channel E-stop relay with plug-in terminal base, 24 VDC.
• PNOZ X3 774310: Three-phase motor monitoring relay, 24–240 VAC/VDC.
• PNOZ X3P 774320: Three-phase motor monitor with plug-in terminal base.

Two-Hand Control

• PNOZ X4 774330: Two-hand control relay, Type IIIC per EN 574, 24 VDC.
• PNOZ X4P 774340: Two-hand control relay with plug-in terminal base, 24 VDC.
• PNOZ X5 774350: Two-hand control relay, 24 VDC, extended output contacts.

Light Curtain / AOPD Interface

• PNOZ X6P 774360: Safety light curtain interface relay, 24 VDC, plug-in base.
• PNOZ X7P 774370: Dual-channel AOPD interface, 24 VDC, plug-in terminal base.

Muting / Extended Function

• PNOZ X8P 774380: Muting relay for AOPD applications, 24 VDC.
• PNOZ XV2 774502: Dual-channel E-stop/safety gate relay, 24 VDC, spring-clamp terminals.
• PNOZ XV3 774503: Three-phase motor monitor, spring-clamp terminals, 24–240 VAC/VDC.
• PNOZ X9 774390: Standstill/speed monitor relay for motor applications, 24 VDC.

Sourcing Hard-to-Find & Obsolete PNOZ X Parts

Multiple PNOZ X variants — including PNOZ X1, X2, X3, X4, and their P-suffix plug-in variants — have been classified by Pilz as mature or discontinued, with recommended migration paths to the PNOZmulti 2 platform. However, full system migration is capital-intensive and operationally disruptive for facilities with large installed bases. DriveKNMS maintains a dedicated inventory of PNOZ X series modules sourced through authorized distribution channels and verified secondary market supply chains.

For discontinued part numbers, DriveKNMS provides: confirmed-authentic units with full traceability documentation, functional test reports generated on application-specific test rigs, and long-term availability commitments for maintenance contracts. Customers operating chemical plants, nuclear facilities, or refineries with 10+ year maintenance horizons can register their PNOZ X part number requirements for priority allocation from reserved stock.

Quality Control for the PNOZ X Range

PNOZ X modules incorporate force-guided (positive-guided) relay contacts and dual-channel input monitoring circuits that require application-specific validation beyond standard power-on testing. DriveKNMS applies the following test protocol to all PNOZ X units prior to dispatch:

• Dual-channel input simulation: Both input channels are independently cycled to verify cross-circuit fault detection and output de-energization response.
• Force-guided contact verification: N/O and N/C contact states are confirmed under load to validate mechanical linkage integrity — a critical requirement for safety-rated outputs.
• Response time measurement: Output relay drop-out time is measured against Pilz datasheet specifications (typically ≤20 ms for PNOZ X2).
• Insulation resistance test: Applied between input/output circuits and chassis ground per IEC 60255 methodology.
• Visual and marking inspection: Date codes, CE markings, and terminal block condition are documented and included in the test report.

All test data is archived per unit serial number and provided with shipment documentation.