Phoenix PSR Series Safety Relays & Bus Modules Selection Guide

Opening: Safety-Critical Control & Bus Communication Solutions for Industrial Systems

The Phoenix PSR series encompasses industrial-grade safety relays (PSR-SCP/SPF) and safety bus modules (PSR-TBUS), designed for machine safety circuits (emergency stops, light curtains) and safety bus communication. These components support diverse control voltages (24DC–230AC), flexible contact configurations (3X1/4X1/4NO/2NC), and specialized functions (redundant monitoring, safety certification, bus communication), complying with EN ISO 13849 and IEC 62061 standards. Widely used in robotics, packaging machinery, and production lines, they ensure fail-safe operation and seamless integration with safety control systems. This guide categorizes models, decodes nomenclature, and provides scenario-based recommendations for efficient selection.

I. Core Advantages of the PSR Series

1. Comprehensive safety certification: Meets SIL 3, PL e, and Cat. 4 safety standards, suitable for high-risk industrial scenarios (e.g., robotic workcells, press machinery).
2. Wide voltage compatibility: Supports 24DC/24UC/60UC/120UC/230UC/230AC/42-48UC control voltages, adapting to global industrial power systems.
3. Diversified functional modules:
   • URM/URD: Redundant power/monitoring for mission-critical systems;
   • ESAM/ESD: Extended safety auxiliary modules for complex safety logic;
   • CE1/CE2: Conformity assessment modules for EU safety compliance;
   • TBUS: Safety bus communication for distributed safety networks.
4. Flexible contact configurations: Covers 3X1 (3NO), 4X1 (4NO), 1X2 (1NO+1NC), 2X2 (2NO+2NC), and 4NO/2NC, matching single/multi-loop safety circuit needs.
5. Industrial durability: -40°C to +70°C operating temperature, IP20 protection, and anti-vibration design for factory floor and outdoor safety control.

II. Product Classification & Detailed Parameter Table

1. PSR-TBUS Series (Safety Bus Modules)

Dedicated to safety bus communication, enabling data exchange between distributed safety devices (e.g., emergency stops, safety scanners) and main controllers.

2. PSR-SPF Series (Safety Monitoring Relays)

Specialized in safety circuit monitoring with universal voltage and multi-contact output, for medium-complexity safety logic.

3. PSR-SCP Series (Safety Coupling Relays)

The core sub-series for safety circuit coupling, with diverse voltage, contact, and functional module variants for different safety scenarios.

III. PSR Series Nomenclature Decoding

PSR-[Sub-series]-[Control Voltage]/[Functional Module]/[Contact Configuration]-[Special Suffix]

• Sub-series:
  • TBUS = Safety bus communication module (for distributed safety networks);
  • SPF = Safety monitoring relay (medium-complexity safety logic);
  • SCP = Safety coupling relay (core series for safety circuit coupling, diverse variants).
• Control Voltage:
  • 24DC/24UC = 24V DC/AC (industrial automation standard);
  • 42-48UC = 42-48V wide DC voltage;
  • 60UC = 60V AC/DC;
  • 120UC = 120V AC/DC (North American standard);
  • 230UC/230AC = 230V AC/DC/AC-only (European/Asian mains);
  • 24-230UC = Cross-voltage (24-230V AC/DC).
• Functional Module:
  • URM/URML/URD = Redundant monitoring (for mission-critical safety circuits);
  • ESAM/ESD = Extended safety auxiliary module (ESAM for basic extension, ESD for diagnostic);
  • CE1/CE2 = EU safety compliance module (CE1 basic, CE2 full compliance);
  • SDC = Safety diagnostic module (for fault localization);
  • MXF = Multi-function safety logic module (complex interlock control);
  • TS = Test signal module (on-demand safety circuit testing).
• Contact Configuration:
  • X1 = Normally open (NO) contact (e.g., 3X1=3NO, 4X1=4NO);
  • X2/X2B = Changeover contact (NO+NC, e.g., 1X2=1NO+1NC);
  • NO/NC = Fixed normally open/closed (e.g., 4NO/2NC=4NO+2NC).
• Special Suffix:
  • TP = Twisted-pair communication (TBUS series);
  • SET = Complete kit (includes relay + accessories);
  • B = Special housing (for cabinet integration);
  • Version (e.g., T1/3) = Software/hardware version identifier.

IV. 3-Step Quick Selection Technique

Step 1: Determine Product Type Based on Safety System Architecture

• Distributed safety networks: Select PSR-TBUS series (e.g., 2981716 PSR-TBUS-TP) for safety bus communication between remote devices.
• Medium-complexity safety monitoring: Choose PSR-SPF series (2981457 PSR-SPF-24UC/URM/4X1/2X2) for redundant monitoring and multi-channel output.
• Safety circuit coupling (most scenarios): Opt for PSR-SCP series (core product line) with matching voltage/module variants.

Step 2: Match Control Voltage to the System Power Supply

• 24V DC PLC safety systems: Pick 24DC/24UC SCP models (e.g., 1046359 PSR-SCP-24UC/CE2/3X1/1X2/B, 1442344 PSR-SCP-24DC/URM4/5X1/2X2/B).
• 230V AC mains safety systems: Select 230UC/230AC SCP models (e.g., 2901428 PSR-SCP-230UC/ESAM4/3X1/1X2/B, 2901430 PSR-SCP-230AC/ESAM2/3X1/1X2/B).
• North American 120V systems: Use 120UC SCP models (e.g., 2981402 PSR-SCP-120UC/URM/5X1/2X2, 2901422 PSR-SCP-120UC/ESAM4/3X1/1X2/B).
• Cross-voltage systems (24-230V): Choose wide-voltage models (e.g., 2981114 PSR-SCP-24-230UC/ESAM4/3X1/1X2).

Step 3: Select Functional Modules & Contacts Based on Safety Requirements

• Redundant/critical safety circuits: Add URM/URD redundant modules (e.g., 2902935 PSR-SCP-42-230UC/URM4/4X1/2X2B, 1442344 PSR-SCP-24DC/URM4/5X1/2X2/B).
• EU-market compliance: Select CE1/CE2 modules (e.g., 1046359 PSR-SCP-24UC/CE2/3X1/1X2/B, 1046360 PSR-SCP-24UC/CE1/3X1/1X2/B).
• Complex safety logic: Use ESAM/ESD/MXF extended modules (e.g., 2901416 PSR-SCP-42-48UC/ESAM4/3X1/1X2B, 2981143 PSR-SCP-24DC/ESD/5X1/1X2/T 1).
• Contact quantity needs:
  • 3-4 NO + 1 changeover: 3X1+1X2 models (e.g., 2901428);
  • 4-5 NO + 2 changeover: 4X1+2X2/5X1+2X2 models (e.g., 2981512, 1442344);
  • Fixed 4NO+2NC: 2702924 PSR-SCP-42-230UC/URM4/4NO/2NC.

V. Recommended Industry-Scenario Combinations

VI. Selection Pitfall Avoidance Guide

1. Voltage mismatch: 24V PLC outputs using 230V AC relays → Confirm system control voltage, select matching 24DC/24UC models (e.g., 1046359) to prevent relay burnout and safety circuit failure.
2. Redundancy neglect: Critical safety circuits (presses/robots) using non-URM modules → Add URM/URD redundant monitoring (e.g., 1442344) to ensure fail-safe operation.
3. EU compliance missing: Exported machinery using non-CE1/CE2 models → Choose CE2-compliant variants (e.g., 1046359) to meet EN ISO 13849 standards and avoid market access barriers.
4. Contact configuration error: Multi-device interlock using 3X1 single-contact relays → Select 4X1+2X2/5X1+2X2 models (e.g., 2981512) to accommodate multiple safety device outputs.
5. Bus communication oversight: Distributed safety networks using standalone SCP relays → Integrate PSR-TBUS modules (e.g., 2981716) to enable centralized safety data monitoring and reduce wiring complexity.

Conclusion: Select the Right PSR Component for Industrial Safety

The Phoenix PSR series provides targeted safety control and bus communication solutions for industrial machinery, covering distributed safety networks, cross-voltage safety circuits, and EU-compliant safety systems.