PNOZ-X2.8P-777301 PILZ Safety Relay

PNOZ-X2.8P-777301-PILZ is the most widely used dual-channel safety relay from Pilz’s PNOZ X product line. Its core advantages cover wide 24V AC/DC operating voltage, 3NO+1NC contact configuration, high safety rating of SIL 3 / pl y, and ultra-fast response within ≤50ms. It is extensively deployed for various industrial safety monitoring applications. Thanks to hardwired design, it delivers superior reliability over software-based solutions under high-vibration and severe EMI conditions, making it an optimal choice for industrial automation safety protection.

Desglose del código del modelo

Segmento de código	Definición	Descripción detallada
PNOZ	Prefijo de serie de productos	Identifier for Pilz core safety relay product range
incógnita	código de serie	Basic standalone safety relay of PNOZ X series, operable without extension modules
2.8	Functional code	“2” stands for dual-channel monitoring; “8” denotes automatic / monitored start mode with 3 safety outputs plus 1 auxiliary output
PAG	Termination type	Screw terminal version; Push-in indicates spring-cage pluggable terminals, unmarked for standard terminals
777301	Número de orden	Unique global part number for purchasing and inventory management
PILZ	Nombre de marca	Pilz GmbH & Co. KG, Alemania

Especificaciones técnicas básicas

Categoría de parámetro	Especificación	Observaciones
General Data
Tipo de producto	Dual-channel safety relay	Cumple con ENISO 13849-1 (pl y) & EN 62061 (SIL 3)
Suministro clasificado	24VCA/CC (±15%)	Wide-range input compatible with standard industrial power supplies
Dimensión	94×22.5×121mm (Alto×Ancho×Profundidad)	22.5mm standard width for compact cabinet layout
Montaje	35carril DIN mm (EN 60715)	Instalación vertical, par de apriete: 0.5~0.8Nm
Características de entrada
Input Circuits	2 independent dual-channel inputs (S11-S12/S52, S21-S22)	24En DC, 30mA input, compatible with PNP sensors
Input Function	Optional cross-contact short-circuit detection	Enabled by short-circuiting S11-S12; disabled by short-circuiting S21-S22
Características de salida
Safety Outputs	3 Normalmente abierto (NO) contacts with redundant dual-contact series design	Redundant structure for guaranteed safe cut-off
Salida auxiliar	1 Normalmente cerrado (CAROLINA DEL NORTE) contacto	Sólo para indicación de estado, NOT permitted in safety circuits
Calificación de contacto	AC1:240V/6A; DC1:24V/6A	AgCuNi silver-copper-nickel contact material for arc oxidation resistance
Calificación de contacto	AC15:230V/5A; DC13:24V/5A
Parámetros de rendimiento
Tiempo de respuesta	≤50ms (input to output); reset time ≤100ms	Fast safety cut-off for high-speed machinery
Consumo de energía	Max.100mA	Low-power design for energy saving
Temperatura ambiente	Operación: -10°C ~ +55°C; Almacenamiento: -35°C ~ +70°C	Suitable for harsh industrial ambient conditions
Protección de ingreso	IP20 (main body), IP40 (terminal area)	Must be installed inside control cabinet ≥IP54
Certificaciones	CE, CCC, UL, RoHS	Global market access certifications

III. Full Range Model List (Core PNOZ X2 Series)

Modelo	Número de pedido.	Voltaje de suministro	Output Configuration	Start Mode	Tipo de terminal
PNOZ X2.8P	777301	24VCA/CC	3NO+1NC	Automático / Monitored	Tornillo
PNOZ X2.8	777300	24VCA/CC	3NO+1NC	Automático / Monitored	Estándar
PNOZ X2.8P PI	777302	24VCA/CC	3NO+1NC	Automático / Monitored	Complemento
PNOZ X2.7P	777311	24~240V AC/DC	3NO+1NC	Automático / Monitored	Tornillo
PNOZ X2.7	777310	24~240V AC/DC	3NO+1NC	Automático / Monitored	Estándar
PNOZ X2.10P	777321	24En DC	2NO+1NC	Reinicio manual	Tornillo
PNOZ X2.11P	777331	24En DC	3NO+1NC	Reinicio manual	Tornillo

Cross-Brand Equivalent Replacement Table

Marca	Alternative Part	Diferencias clave	Ámbito de aplicación
Schneider	Zelio SR2B121BD	Monocanal, 2NO+1NC, 24VDC only	Low-risk applications with limited budget
siemens	3SK1111-1AB30	Doble canal,3NO+1NC,24VCA/CC	Full drop-in replacement, SIL3 compliant
Omrón	G9SA-321-T075	Doble canal,3NO+1NC,24VCA/CC	Matched for Japanese-built equipment, rentable
TEJIDO	MSR125TP	Doble canal,3NO+1NC,24VCA/CC	Heavy-duty machinery with superior anti-vibration performance
Pilz Upgrade	PNOZ X2.7P (777311)	Amplio voltaje:24~240V AC/DC	Global projects with varying supply voltages

Entorno de aplicación & Casos de la industria

Aplicaciones recomendadas

Machinery Safety Monitoring: Emergency stop pushbuttons, safety door interlocks, safety light curtains, two-hand control stations
Fabricación de automóviles: Welding robots, coating production lines, lithium battery equipment interlock control
Electronics Assembly: SMT placement machines, AOI inspection equipment, laser cutter safety circuits
Maquinaria de embalaje: High-speed packaging lines, palletizing robots, over-temperature protection for heat-sealing devices
Logistics Automation: Stacker cranes, AGV, conveyor safety door & E-stop systems

Non-Recommended Applications

Safety systems requiring complex logic operations (PNOZmulti modular safety controller recommended)

Extreme high-vibration environments (>10gramo): extra vibration dampening required

Unprotected outdoor mounting (only IP20 body protection)

Casos de aplicación típicos

Case1: Lithium Battery Aging Room Safety Control for Automotive Industry

Funciones: Access door interlock, emergency cut-off on over-temperature, fire protection linkage

Configuración: PNOZ X2.8P(777301)+safety door switch+temperature sensor+E-stop button

Outcome: PL e safety level achieved to prevent thermal runaway of lithium cells

Case2: Safety Circuit Retrofit for Laser Cutting Machine

Original Issue: Distributed safety PLC I/O triggered false shutdown twice in three years due to EMI interference

Solución: Replace with hardwired safety circuit using PNOZ X2.8P

Resultado: Zero breakdown over 5 años, response optimized ≤50ms, costos de mantenimiento reducidos 60%

Consejos de selección & Reglas de referencia rápida

Quick Selection Formula

24V AC/DC X2.8, dual-channel with three NO & one NC<br>

Terminal de tornillo 777301, automatic start with top safety grade<br>

Molestar, cortina de luz & puerta de seguridad, certified SIL3 & pl y<br>

DIN rail mounting saves cabinet space, fits all industrial sites

Reglas de referencia rápida

Model Memorization: PNOZ X2.8P = Dual-channel + Mode8 + P=screw terminals
Código de pedido:777301 = standard baseline part of Pilz X2 family
Core Specs:24VCA/CC,3NO+1NC,≤50ms response,SIL3/PL e
Terminal Wiring Rules:

Short S11-S12: Activate contact short-circuit detection

Short S21-S22: Deactivate contact short-circuit detection

Short S12-S34: Enable automatic start mode

Short S52-S11: Enable automatic reset function

VII. Instalación & Pautas de mantenimiento

Especificaciones de instalación

Mount vertically inside control cabinet with terminals facing upward for natural convection cooling
Maintain ≥50mm clearance from heat-generating components, ≥30mm from cabinet inner walls
Separate wiring of safety circuits and power circuits; route crossing wires at 90° to reduce EMI coupling
Install 10A fuse in series ahead of output contacts for contact protection

Common Troubleshooting Guide

Fenómeno de falla	Root Cause	Remedial Action
Indicador de encendido apagado	1. No power supply or reversed polarity	1. Verify A1/A2 wiring
Indicador de encendido apagado	2. Input voltage out of tolerance	2. Confirm stable 24V AC/DC supply
Safety outputs fail to close	1. Open input circuit	1. Check continuity of S11-S12/S21-S22
Safety outputs fail to close	2. Incorrect start circuit configuration	2. Confirm jumper status of S12-S34
Contact ablation/burning	1. Overloaded output rating	1. Upgrade to higher-rated relay
Contact ablation/burning	2. Missing snubber for inductive loads	2. Fit freewheeling diode(corriente continua) or varistor(C.A.) in parallel
Unexpected false tripping	1. Electromagnetic interference on input lines	1. Apply shielded cable with proper grounding
Unexpected false tripping	2. Misconfigured short-circuit detection	2. Adjust S11-S12/S21-S22 jumper setup