Phoenix PLC-RSC Series: Industrial Interface Relay Modules - Selection Guide

Product Overview

The Phoenix PLC-RSC Series are industrial-grade interface relay modules designed to bridge PLC outputs with external devices in automation systems. Supporting a wide range of input voltages (5V DC~230V AC, including 24V AC/DC universal input), diverse contact configurations (1CO/2CO), and functional features (gold-plated contacts, high-capacity, explosion-proof, manual operation), these modules provide reliable electrical isolation, signal conversion, and load protection. With robust construction, 35mm DIN rail mounting, and compatibility with industrial control systems, they’re ideal for machine control, process automation, and safety-related circuits—especially in scenarios requiring adaptation to multiple voltage domains and load types.

Model Quick Reference Table

Core Technical Specifications (Universal)

Application Scenarios & Recommended Models

1. High-Power Load Control (≤10A)

• Requirement: 230V AC/48V DC high-current loads (solenoid valves, small motors)
• Recommended Models: 1079402 (230AC/21HC), 2967646 (48DC/21HC)
• Key Reason: AgSnO HC contacts handle 10A loads; compatible with high-voltage AC/DC systems

2. Low-Level/Sensitive Signal Switching

• Requirement: Precision sensor or measuring equipment signal control
• Recommended Models: 2966142 (60DC/21AU), 2966278 (24UC/21AU)
• Key Reason: Gold-plated (AU) contacts reduce contact resistance, ideal for low-voltage sensitive signals

3. Hazardous Area Applications

• Requirement: Explosion-proof dual-channel switching in dangerous zones
• Recommended Model: 2909517 (PLC-RSC-12DC/21-21/EX)
• Key Reason: EX certification ensures safe operation in chemical plants, oil refineries

4. On-Site Debugging & Maintenance

• Requirement: Manual operation for testing without PLC signals
• Recommended Model: 2910504 (PLC-RSC-48DC/21-21/MS)
• Key Reason: MS (Manual Operation) function simplifies on-site troubleshooting

5. Dual-Channel Control Systems

• Requirement: 230AC/48DC dual-load simultaneous control
• Recommended Models: 1079387 (230AC/21-21), 2967248 (48DC/21-21)
• Key Reason: 2CO contacts support two independent load circuits; standard configuration for general automation

6. High-Voltage DC System Control

• Requirement: 125V DC/220V DC industrial equipment switching
• Recommended Models: 2980021 (125DC/21), 2987286 (220DC/21AU)
• Key Reason: Wide input voltage tolerance adapts to high-voltage DC power grids

Core Advantages

• Wide Voltage Compatibility: Covers 5V DC~230V AC (including 24V AC/DC universal input) for diverse industrial systems
• Diverse Contact Options: Standard/HC/AU contacts fit high-power, low-level, and precision applications
• Functional Versatility: Supports explosion-proof (EX) and manual operation (MS) for special needs
• Industrial-Grade Durability: -40℃~70℃ operating temperature and 4kV insulation strength resist harsh environments
• Easy Installation: DIN rail mounting and secure screw terminals simplify cabinet layout
• Global Compliance: CE/UL/CSA certifications enable international deployment

Installation & Usage Notes

• Voltage Matching: Ensure input voltage aligns with module ratings (e.g., 24UC models for mixed 24V AC/DC; 220DC models avoid AC input)
• Load Matching: Select HC models for >6A loads, AU models for <50mA low-level signals, and standard models for general loads
• EX Model Installation: Deploy 2909517 in compliance with ATEX/IECEx standards (proper grounding, zone restrictions)
• MS Function Use: Use manual operation only for debugging; avoid long-term manual activation to prevent contact wear
• Wiring Care: Strip wires to 10mm for full insertion into terminals; use shielded cables in EMI-prone environments
• High-Voltage Caution: For 125DC/220DC models, use high-voltage-rated cables and ensure proper insulation to avoid arcing
• Mounting Spacing: Reserve ≥5mm between modules for heat dissipation, especially for HC high-current models